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CS4271 24-Bit, 192 kHz Stereo Audio CODEC
D/A Features
! High
A/D Features
! High
Performance
Performance
- 114 dB Dynamic Range - -100 dB THD+N
! Up
- 108 dB Dynamic Range - -98 dB THD+N
! Up
to 192 kHz Sampling Rates ! Differential Analog Architecture ! Volume Control with Soft Ramp
- 1 dB Step Size - Zero Crossing Click-free Transitions
! Selectable ! ATAPI
Digital Filters
- Fast and Slow Roll Off
to 192 kHz Sampling Rates Analog Architecture ! Multi-bit Delta Sigma Conversion ! High-pass Filter or DC Offset Calibration ! Low-Latency Digital Anti-alias Filtering ! Automatic Dithering of 16-bit Data ! Selectable Serial Audio Interface Formats
! Single-Ended
Mixing Functions ! Selectable Serial Audio Interface Formats
- Left Justified up to 24-bit - I2S up to 24-bit - Right Justified 16-, 18-, 20-, and 24-Bit
! Control
- Left Justified up to 24-bit - I2S up to 24-bit
System Features
! Direct
Output for External Muting ! Selectable 50/15 s De-emphasis
Interface with 5V to 2.5V Logic Levels ! Internal Digital Loopback ! On-chip Oscillator ! Stand-Alone or Control Port Functionality
5V
2.5 V to 5 V
3.3 V to 5 V
Level Translator
Hardware or I2C/SPI Control Data Reset
Register / Hardware Configuration
Internal Voltage Reference
Internal Oscillator
External Mute Control
Left and Right Mute Controls
PCM Serial Interface / Loopback
Mixer
Volume Control Volume Control
Selectable Interpolation Filter Selectable Interpolation Filter
Modulator
Switched Capacitor DAC and Filter
Left Differential Output Right Differential Output
Level Translator
Serial Audio Input Serial Audio Output
Modulator
Switched Capacitor DAC and Filter
High Pass Filter & DC Offset Calibration High Pass Filter & DC Offset Calibration
Low-Latency Anti-Alias Filter Low-Latency Anti-Alias Filter
Multibit Oversampling ADC Multibit Oversampling ADC
Left Input
Right Input
Cirrus Logic, Inc. www.cirrus.com
Copyright (c) Cirrus Logic, Inc. 2005 (All Rights Reserved)
AUGUST '05 DS592F1
CS4271
Stand-Alone Mode Feature Set
! System Features - Serial Audio Port Master or Slave Operation - Internal Oscillator for Master Clock ! D/A Features - Auto-mute on Static Samples - 44.1 kHz 50/15 s De-emphasis Available - Selectable Serial Audio Interface Formats "Left Justified up to 24-bit "I2S up to 24-bit ! A/D Features - Automatic Dithering for 16-bit Data - High-pass Filter - Selectable Serial Audio Interface Formats "Left Justified up to 24-bit "I2S up to 24-bit
General Description
The CS4271 is a high-performance, integrated audio CODEC. The CS4271 performs stereo analog-to-digital (A/D) and digital-to-analog (D/A) conversion of up to 24-bit serial values at sample rates up to 192 kHz. The D/A offers a volume control that operates with a 1 dB step size. It incorporates selectable soft ramp and zero crossing transition functions to eliminate clicks and pops. The D/A's integrated digital mixing functions allow a variety of output configurations ranging from a channel swap to a stereo-to-mono downmix. Standard 50/15 s de-emphasis is available for sampling rates of 32, 44.1, and 48 kHz for compatibility with digital audio programs mastered using the 50/15 s preemphasis technique. Integrated level translators allow easy interfacing between the CS4271 and other devices operating over a wide range of logic levels. An on-chip oscillator eliminates the need for an external crystal oscillator circuit. This can reduce overall design cost and conserve circuit board space. The CS4271 automatically uses the on-chip oscillator in the absence of an applied master clock, making this feature easy to use. Independently addressable high-pass filters are available for the right and left channel of the A/D. This allows the A/D to be used in a wide variety of applications where one audio channel and one DC measurement channel is desired. The CS4271's wide dynamic range, negligible distortion, and low noise make it ideal for applications such as A/V receivers, DVD-R, CD-R, digital mixing consoles, effects processors, set-top box systems, and automotive audio systems.
Software Mode Feature Set
! System Features - Serial Audio Port Master or Slave Operation - Internal Oscillator for Master Clock - Internal Digital Loopback Available ! D/A Features - Selectable Auto-mute - Selectable Interpolation Filters - Selectable 32-, 44.1-, and 48-kHz De-emphasis Filters - Configurable ATAPI Mixing Functions - Configurable Volume and Muting Controls - Selectable Serial Audio Interface Formats "Left Justified up to 24-bit "I2S up to 24-bit "Right Justified 16, 18, 20, and 24-bit ! A/D Features - Selectable Dithering for 16-bit Data - Selectable High-pass Filter or DC Offset Calibration - Selectable Serial Audio Interface Formats "Left Justified up to 24-bit "I2S up to 24-bit
Ordering Information
Product CS4271 CDB4271 Description 24-Bit, 192 kHz Stereo Audio CODEC CS4271 Evaluation Board Package 28-pin TSSOP Pb-Free YES Automotive No -40 to +85 C Grade Commercial Temp Range -10 to +70 C Container Tube Tape & Reel Tube Tape & Reel Order # CS4271-CZZ CS4271-CZZR CS4271-DZZ CS4271-DZZR CDB4271
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TABLE OF CONTENTS
1. PIN DESCRIPTIONS - SOFTWARE MODE ............................................................................. 5 2. PIN DESCRIPTIONS - STAND-ALONE MODE ....................................................................... 7 3. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 9 SPECIFIED OPERATING CONDITIONS ................................................................................. 9 ABSOLUTE MAXIMUM RATINGS ........................................................................................... 9 DAC ANALOG CHARACTERISTICS - COMMERCIAL GRADE............................................ 10 DAC ANALOG CHARACTERISTICS - AUTOMOTIVE GRADE ............................................ 11 DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE................ 12 ADC ANALOG CHARACTERISTICS - COMMERCIAL GRADE............................................ 14 ADC ANALOG CHARACTERISTICS - AUTOMOTIVE GRADE ............................................ 15 ADC DIGITAL FILTER CHARACTERISTICS......................................................................... 16 DC ELECTRICAL CHARACTERISTICS ................................................................................ 17 DIGITAL CHARACTERISTICS............................................................................................... 17 SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT................................................. 18 SWITCHING CHARACTERISTICS - IC MODE CONTROL PORT....................................... 21 SWITCHING CHARACTERISTICS - SPI CONTROL PORT ................................................. 22 4. TYPICAL CONNECTION DIAGRAM ..................................................................................... 23 5. APPLICATIONS ..................................................................................................................... 24 5.1 Stand-Alone Mode ........................................................................................................... 24 5.1.1 Recommended Power-Up Sequence ................................................................. 24 5.1.2 Master/Slave Mode ............................................................................................. 24 5.1.3 System Clocking ................................................................................................. 24 5.1.3.1 Crystal Applications (XTI/XTO) ........................................................... 24 5.1.3.2 Clock Ratio Selection .......................................................................... 25 5.1.4 16-Bit Auto-Dither ............................................................................................... 26 5.1.5 Auto-Mute ........................................................................................................... 26 5.1.6 High Pass Filter ................................................................................................... 26 5.1.7 Interpolation Filter .............................................................................................. 26 5.1.8 Mode Selection & De-Emphasis ......................................................................... 26 5.1.9 Serial Audio Interface Format Selection ............................................................. 26 5.2 Control Port Mode ........................................................................................................... 27 5.2.1 Recommended Power-Up Sequence - Access to Control Port Mode ................ 27 5.2.2 Master / Slave Mode Selection ........................................................................... 27 5.2.3 System Clocking ................................................................................................. 27 5.2.3.1 Crystal Applications (XTI/XTO) ........................................................... 27 5.2.3.2 Clock Ratio Selection .......................................................................... 28 5.2.4 Internal Digital Loopback .................................................................................... 30 5.2.5 Dither for 16-Bit Data .......................................................................................... 30 5.2.6 Auto-Mute ........................................................................................................... 30 5.2.7 High Pass Filter and DC Offset Calibration ......................................................... 30 5.2.8 Interpolation Filter .............................................................................................. 31 5.2.9 De-Emphasis ...................................................................................................... 31 5.2.10 Oversampling Modes ........................................................................................ 31 5.3 De-Emphasis Filter .......................................................................................................... 31 5.4 Analog Connections ........................................................................................................ 32 5.4.1 Input Connections ............................................................................................... 32 5.4.2 Output Connections ............................................................................................ 33 5.5 Mute Control .................................................................................................................... 34 5.6 Synchronization of Multiple Devices ................................................................................ 34 5.7 Grounding and Power Supply Decoupling ....................................................................... 34 6. CONTROL PORT INTERFACE .............................................................................................. 35
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6.1 SPI Mode ......................................................................................................................... 35 6.2 IC Mode .......................................................................................................................... 36 7. REGISTER QUICK REFERENCE .......................................................................................... 37 8. REGISTER DESCRIPTION .................................................................................................... 38 8.1 Mode Control 1 - Address 01h ......................................................................................... 38 8.1.1 Functional Mode (Bits 7:6) .................................................................................. 38 8.1.2 Ratio Select (Bits 5:4) ......................................................................................... 38 8.1.3 Master / Slave Mode (Bit 3) ................................................................................. 38 8.1.4 DAC Digital Interface Format (Bits 2:0) ............................................................... 38 8.2 DAC Control - Address 02h ............................................................................................. 39 8.2.1 Auto-Mute (Bit 7) ................................................................................................. 39 8.2.2 Interpolation Filter Select (Bit 6) .......................................................................... 39 8.2.3 De-Emphasis Control (Bits 5:4) ........................................................................... 39 8.2.4 Soft Volume Ramp-Up After Error (Bit 3) ............................................................ 40 8.2.5 Soft Ramp-Down Before Filter Mode Change (Bit 2) .......................................... 40 8.2.6 Invert Signal Polarity (Bits 1:0) ............................................................................ 40 8.3 DAC Volume & Mixing Control - Address 03h ................................................................. 40 8.3.1 Channel B Volume = Channel A Volume (Bit 6) ................................................. 40 8.3.2 Soft Ramp or Zero Cross Enable (Bits 5:4) ......................................................... 40 8.3.3 ATAPI Channel Mixing and Muting (Bits 3:0) ...................................................... 41 8.4 DAC Channel A Volume Control - Address 04h .............................................................. 42 8.5 DAC Channel B Volume Control - Address 05h .............................................................. 42 8.5.1 Mute (Bit 7) .......................................................................................................... 42 8.5.2 Volume Control (Bits 6:0) .................................................................................... 42 8.6 ADC Control - Address 06h ............................................................................................. 43 8.6.1 Dither for 16-Bit Data (Bit 5) ................................................................................ 43 8.6.2 ADC Digital Interface Format (Bit 4) .................................................................... 43 8.6.3 ADC Channel A & B Mute (Bits 3:2) .................................................................... 43 8.6.4 Channel A & B High Pass Filter Disable (Bits 1:0) .............................................. 43 8.7 Mode Control 2 - Address 07h ......................................................................................... 43 8.7.1 Digital Loopback (Bit 4) ....................................................................................... 43 8.7.2 AMUTEC = BMUTEC (Bit 3) ............................................................................... 43 8.7.3 Freeze (Bit 2) ...................................................................................................... 44 8.7.4 Control Port Enable (Bit 1) .................................................................................. 44 8.7.5 Power Down (Bit 0) ............................................................................................. 44 8.8 Chip ID - Register 08h ..................................................................................................... 44 8.8.1 Chip ID (Bits 7:4) ................................................................................................. 44 8.8.2 Chip Revision (Bits 3:0) ....................................................................................... 44 9. PARAMETER DEFINITIONS .................................................................................................. 45 10. PACKAGE DIMENSIONS ..................................................................................................... 46 11. APPENDIX ............................................................................................................................ 47
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1. PIN DESCRIPTIONS - SOFTWARE MODE
XTO XTI MCLK LRCK SCLK SDOUT SDIN DGND VD VL SCL/CCLK SDA/CDIN AD0/CS RST
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28-Pin TSSOP
28 27 26 25 24 23 22 21 20 19 18 17 16 15
BMUTEC AOUTBAOUTB+ AOUTA+ AOUTAAMUTEC FILT+ AGND VA VQ3 AINB AINA VQ2 VQ1
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Pin Name
XTO XTI MCLK LRCK SCLK SDOUT SDIN DGND VD VL SCL/CCLK SDA/CDIN AD0/CS RST VQ1 VQ2 AINA AINB VQ3 VA AGND FILT+ AMUTEC AOUTAAOUTA+ AOUTB+ AOUTBBMUTEC
# 1,2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Pin Description
Crystal Connections (Input/Output) - I/O pins for an external crystal which may be used to generate MCLK. See "Crystal Applications (XTI/XTO)" on page 24 or "Crystal Applications (XTI/XTO)" on page 27. Master Clock (Input/Output) -Clock source for the delta-sigma modulators. See "Crystal Applications (XTI/XTO)" on page 24 or "Crystal Applications (XTI/XTO)" on page 27. Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the serial audio data line. Serial Clock (Input/Output) - Serial clock for the serial audio interface. Serial Audio Data Output (Output) - Output for two's complement serial audio data. Serial Audio Data Input (Input) - Input for two's complement serial audio data. Digital Ground (Input) - Ground reference for the internal digital section. Digital Power (Input) - Positive power for the internal digital section. Logic Power (Input) - Positive power for the digital input/output interface. Serial Control Port Clock (Input) - Serial clock for the serial control port. Serial Control Data (Input/Output) - SDA is a data I/O in IC mode. CDIN is the input data line for the control port interface in SPI mode. Address Bit 0 (IC) / Control Port Chip Select (SPI) (Input) - AD0 is a chip address pin in IC mode; CS is the chip select signal for SPI format. Reset (Input) - The device enters a low power mode when this pin is driven low. Quiescent Voltage (Output) - Filter connection for internal quiescent reference voltage. Quiescent Voltage (Input) - Connection for internal quiescent reference voltage.
17, Analog Input (Input) - The full scale input level is specified in the ADC Analog Characteristics specifica18 tion table. 19 20 21 22 23
Quiescent Voltage (Input) - Connection for internal quiescent reference voltage. Analog Power (Input) - Positive power for the internal analog section. Analog Ground (Input) - Ground reference for the internal analog section. Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits. Channel A Mute Control (Output) - This pin is active during power-up initialization, reset, muting, when master clock to left/right clock frequency ratio is incorrect, or power-down.
24, 25, Differential Analog Audio Output (Output) - The full scale differential output level is specified in the 26, DAC Analog Characteristics specification table. 27 28
Channel B Mute Control (Output) - This pin is active during power-up initialization, reset, muting, when master clock to left/right clock frequency ratio is incorrect, or power-down.
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2. PIN DESCRIPTIONS - STAND-ALONE MODE
XTO XTI MCLK LRCK SCLK SDOUT (M/S) SDIN DGND VD VL M0 M1 I2S/LJ RST
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28-Pin TSSOP
28 27 26 25 24 23 22 21 20 19 18 17 16 15
BMUTEC AOUTBAOUTB+ AOUTA+ AOUTAAMUTEC FILT+ AGND VA VQ3 AINB AINA VQ2 VQ1
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Pin Name
XTO XTI MCLK LRCK SCLK SDOUT (M/S) SDIN DGND VD VL M0 M1 I2S/LJ RST VQ1 VQ2 AINA AINB VQ3 VA AGND FILT+ AMUTEC AOUTAAOUTA+ AOUTB+ AOUTBBMUTEC
#
Pin Description
Crystal Connections (Input/Output) - I/O pins for an external crystal which may be used to generate the
1,2 master clock. See "Crystal Applications (XTI/XTO)" on page 24 or "Crystal Applications (XTI/XTO)" on
page 27.
3 4 5 6 7 8 9 10 11 12 13 14 15 16
Master Clock (Input/Output) -Clock source for the delta-sigma modulators. See "Crystal Applications (XTI/XTO)" on page 24 or "Crystal Applications (XTI/XTO)" on page 27. Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the serial audio data line. Serial Clock (Input/Output) - Serial clock for the serial audio interface. Serial Audio Data Output (Output) - Output for two's complement serial audio data. This pin must be pulled-up or pulled-down to select Master or Slave Mode. See "Master/Slave Mode" on page 24. Serial Audio Data Input (Input) - Input for two's complement serial audio data. Digital Ground (Input) - Ground reference for the internal digital section. Digital Power (Input) - Positive power for the internal digital section. Logic Power (Input) - Positive power for the digital input/output interface. Mode Select 0 (Input) - In conjunction with M1, selects operating mode. Functionality is described in the Hardware Mode Speed Configuration table. Mode Select 1 (Input) - In conjunction with M0, selects operating mode. Functionality is described in the Hardware Mode Speed Configuration table. Serial Audio Interface Select (Input) - Selects either the left-justified or I2S format for the Serial Audio Interface. Reset (Input) - The device enters a low power mode when this pin is driven low. Quiescent Voltage (Output) - Filter connection for internal quiescent reference voltage. Quiescent Voltage (Input) - Connection for internal quiescent reference voltage.
17, Analog Input (Input) - The full scale input level is specified in the ADC Analog Characteristics specifica18 tion table. 19 20 21 22 23
Quiescent Voltage (Input) - Connection for internal quiescent reference voltage. Analog Power (Input) - Positive power for the internal analog section. Analog Ground (Input) - Ground reference for the internal analog section. Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits. Channel A Mute Control (Output) - This pin is active during power-up initialization, reset, muting, when master clock to left/right clock frequency ratio is incorrect, or power-down.
24, 25, Differential Analog Audio Output (Output) - The full scale differential output level is specified in the 26, Analog Characteristics specification table. 27 28
Channel B Mute Control (Output) - This pin is active during power-up initialization, reset, muting, when master clock to left/right clock frequency ratio is incorrect, or power-down.
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3. CHARACTERISTICS AND SPECIFICATIONS
(All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications are derived from measurements taken at nominal supply voltages and TA = 25C.)
SPECIFIED OPERATING CONDITIONS (AGND = 0 V; all voltages with respect to ground.)
Parameters Positive Analog Positive Digital Positive Logic Ambient Operating Temperature (Power Applied) Commercial Grade Automotive Grade DC Power Supplies: Symbol VA VD VL TA Min 4.75 3.1 2.37 -10 -40 Nom 5.0 3.3 3.3 Max 5.25 5.25 5.25 +70 +85 Units V V V C C
ABSOLUTE MAXIMUM RATINGS (GND = 0 V, All voltages with respect to ground.) (Note 1)
Parameter DC Power Supplies: Analog Logic Digital (Note 2) Symbol VA VL VD Iin VIN VIND TA Tstg Min -0.3 -0.3 -0.3 GND-0.3 -0.3 -50 -65 Typ Max +6.0 +6.0 +6.0 10 VA+0.3 VL+0.3 +95 +150 Units V V V mA V V C C
Input Current Analog Input Voltage Digital Input Voltage Ambient Operating Temperature (Power Applied) Storage Temperature
Notes: 1. Operation beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes. 2. Any pin except supplies. Transient currents of up to 100 mA on the analog input pins will not cause SCR latch-up.
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DAC ANALOG CHARACTERISTICS - COMMERCIAL GRADE
Parameter Dynamic Performance Dynamic Range 24-Bits 16-Bits Total Harmonic Distortion + Noise A-Weighted unweighted unweighted 0 dB THD+N -20 dB -60 dB (1 kHz) ICGM 108 105 VFS (note 7) Zout RL CL 0.91xVA 114 111 94 -100 -91 -51 114 100 0.1 100 0.96xVA 100 3 100 -94 -45 1.01xVA dB dB dB dB dB dB dB dB dB ppm/C Vpp k pF Symbol Min Typ (Notes 3 to 7) Max Unit
Idle Channel Noise / Signal-to-Noise Ratio Interchannel Isolation DC Accuracy Interchannel Gain Mismatch Gain Drift Analog Output Characteristics and Specifications Full Scale Differential Output Voltage Output Resistance Minimum AC-Load Resistance Maximum Load Capacitance
Notes: 3. One-half LSB of Triangular PDF dither is added to data. 4. Performance measurements taken with a full-scale 997 Hz sine wave under Test load RL = 3 k, CL = 10 pF 5. Measurement bandwidth is 10 Hz to 20 kHz. 6. Logic "0" = GND = 0V; Logic "1" = VL; VL = VA unless otherwise noted. 7. VFS is tested under load RL but does not include attenuation due to ZOUT
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DAC ANALOG CHARACTERISTICS - AUTOMOTIVE GRADE
Parameter Dynamic Performance Dynamic Range 24-Bits 16-Bits Total Harmonic Distortion + Noise A-Weighted unweighted unweighted 0 dB THD+N -20 dB -60 dB (1 kHz) ICGM 106 103 VFS (note 7) Zout RL CL 0.91xVA 114 111 94 -100 -91 -51 114 100 0.1 100 0.96xVA 100 3 100 -92 -43 1.01xVA dB dB dB dB dB dB dB dB dB ppm/C Vpp k pF Symbol Min Typ (Notes 3 to 7) Max Unit
Idle Channel Noise / Signal-to-Noise Ratio Interchannel Isolation DC Accuracy Interchannel Gain Mismatch Gain Drift Analog Output Characteristics and Specifications Full Scale Differential Output Voltage Output Resistance Minimum AC-Load Resistance Maximum Load Capacitance
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DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE
(Note 12) Parameter Single Speed Mode - 48 kHz Passband (Note 9) Frequency Response 10 Hz to 20 kHz StopBand StopBand Attenuation Group Delay De-emphasis Error (Note 11) (Relative to 1kHz) Double Speed Mode - 96 kHz Passband (Note 9) Frequency Response 10 Hz to 20 kHz StopBand StopBand Attenuation Group Delay Quad Speed Mode - 192 kHz Passband (Note 9) Frequency Response 10 Hz to 20 kHz StopBand StopBand Attenuation Group Delay Min to -0.01 dB corner to -3 dB corner 0 0 -0.01 .547 90 0 0 -0.01 .583 80 0 0 -0.01 .635 90 Fast Roll-Off Typ 12/Fs 4.6/Fs 4.7/Fs Max .454 .499 +0.01 0.23 0.14 0.09 .430 .499 0.01 .105 .490 0.01 Unit Fs Fs dB Fs dB s dB dB dB Fs Fs dB Fs dB s Fs Fs dB Fs dB s
(Note 10) Fs = 32 kHz Fs = 44.1 kHz Fs = 48 kHz to -0.01 dB corner to -3 dB corner
(Note 10)
to -0.01 dB corner to -3 dB corner
(Note 10)
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DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE
(cont) (Note 12) Parameter Single Speed Mode - 48 kHz Passband (Note 9) Frequency Response 10 Hz to 20 kHz StopBand StopBand Attenuation Group Delay De-emphasis Error (Note 11) (Relative to 1 kHz) Double Speed Mode - 96 kHz Passband (Note 9) Frequency Response 10 Hz to 20 kHz StopBand StopBand Attenuation Group Delay Quad Speed Mode - 192 kHz Passband (Note 9) Frequency Response 10 Hz to 20 kHz StopBand StopBand Attenuation Group Delay Slow Roll-Off (Note 8) Min Typ Max to -0.01 dB corner to -3 dB corner 0 0 -0.01 .583 64 0 0 -0.01 .792 70 0 0 -0.01 .868 75 6.5/Fs 3.9/Fs 4.2/Fs 0.417 0.499 +0.01 0.23 0.14 0.09 .296 .499 0.01 .104 .481 0.01 Unit Fs Fs dB Fs dB s dB dB dB Fs Fs dB Fs dB s Fs Fs dB Fs dB s
(Note 10) Fs = 32 kHz Fs = 44.1 kHz Fs = 48 kHz to -0.01 dB corner to -3 dB corner
(Note 10)
to -0.01 dB corner to -3 dB corner
(Note 10)
Notes: 8. Slow Roll-Off interpolation filter is only available in control port mode. 9. Response is clock dependent and will scale with Fs. Note that the response plots (Figures 21 to 44) have been normalized to Fs and can be de-normalized by multiplying the X-axis scale by Fs. 10. Single and Double Speed Mode Measurement Bandwidth is from stopband to 3 Fs. Quad Speed Mode Measurement Bandwidth is from stopband to 1.34 Fs. 11. De-emphasis is available only in Single Speed Mode; Only 44.1 kHz De-emphasis is available in StandAlone Mode. 12. Plots of this data are contained in the "Appendix" on page 47. See Figure 21 through Figure 44.
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ADC ANALOG CHARACTERISTICS - COMMERCIAL GRADE
Measurement Bandwidth is 10 Hz to 20 kHz unless otherwise specified. Input is 1 kHz sine wave. Parameter Fs = 48 kHz A-weighted unweighted Total Harmonic Distortion + Noise (Note 13) -1 dB -20 dB -60 dB Double Speed Mode Fs = 96 kHz Dynamic Range A-weighted unweighted 40kHz bandwidth unweighted Total Harmonic Distortion + Noise (Note 13) -1 dB -20 dB -60 dB 40kHz bandwidth -1 dB Quad Speed Mode Fs = 192 kHz Dynamic Range A-weighted unweighted 40kHz bandwidth unweighted Total Harmonic Distortion + Noise (Note 13) -1 dB -20 dB -60 dB 40kHz bandwidth -1 dB Dynamic Performance for All Modes Interchannel Isolation Interchannel Phase Deviation DC Accuracy Interchannel Gain Mismatch Gain Error Gain Drift Offset Error HPF enabled HPF disabled Analog Input Characteristics Full-scale Input Voltage Input Impedance Single Speed Mode Dynamic Range Symbol Min 102 99 THD+N 102 99 THD+N 102 99 THD+N 0.51xVA 18 -98 -85 -45 -95 110 0.0001 0.1 -92 dB dB dB dB dB Degree dB % ppm/C LSB LSB Vpp k -98 -85 -45 -95 108 105 102 -92 dB dB dB dB dB dB dB -98 -85 -45 108 105 102 -92 dB dB dB dB dB dB Typ 108 105 Max Unit dB dB
100
0 100 0.565xVA -
5
0.62xVA -
Notes: 13. Referred to the typical full-scale input voltage.
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ADC ANALOG CHARACTERISTICS - AUTOMOTIVE GRADE
Measurement Bandwidth is 10 Hz to 20 kHz unless otherwise specified. Input is 1 kHz sine wave.) Parameter Fs = 48 kHz A-weighted unweighted Total Harmonic Distortion + Noise (Note 14) -1 dB -20 dB -60 dB Double Speed Mode Fs = 96 kHz Dynamic Range A-weighted unweighted 40kHz bandwidth unweighted Total Harmonic Distortion + Noise (Note 14) -1 dB -20 dB -60 dB 40kHz bandwidth -1 dB Quad Speed Mode Fs = 192 kHz Dynamic Range A-weighted unweighted 40kHz bandwidth unweighted Total Harmonic Distortion + Noise (Note 14) -1 dB -20 dB -60 dB 40kHz bandwidth -1 dB Dynamic Performance for All Modes Interchannel Isolation Interchannel Phase Deviation DC Accuracy Interchannel Gain Mismatch Gain Error Gain Drift Offset Error HPF enabled HPF disabled Analog Input Characteristics Full-scale Input Voltage Input Impedance Single Speed Mode Dynamic Range Symbol Min 101 98 THD+N 101 98 THD+N 101 98 THD+N 0.51xVA 18 -98 -85 -45 -95 110 0.0001 0.1 -91 dB dB dB dB dB Degree dB % ppm/C LSB LSB Vpp k -98 -85 -45 -95 108 105 102 -91 dB dB dB dB dB dB dB -98 -85 -45 108 105 102 -91 dB dB dB dB dB dB Typ 108 105 Max Unit dB dB
100
0 100 0.565xVA -
5
0.62xVA -
Notes: 14. Referred to the typical full-scale input voltage.
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ADC DIGITAL FILTER CHARACTERISTICS
Parameter Single Speed Mode Passband Passband Ripple. Stopband. Stopband Attenuation. Group Delay. Double Speed Mode Passband Passband Ripple. Stopband. Stopband Attenuation. Group Delay. Quad Speed Mode Passband Passband Ripple. Stopband. Stopband Attenuation. Group Delay. High Pass Filter Characteristics Frequency Response Phase Deviation Passband Ripple. Filter Settling Time. Notes: 15. The filter frequency response scales precisely with Fs. 16. Response shown is for Fs equal to 48 kHz. Filter characteristics scale with Fs. 17. Plots of this data are contained in the "Appendix" on page 47. See Figure 45 through Figure 56. -3.0 dB. -0.13 dB. @ 20 Hz. (Note 16) (Note 16) 1 20 10 105/Fs 0 Hz Hz Deg dB s tgd (Note 15) (-0.1 dB). (Note 15) 0 0.78 -97 5/Fs 0.24 0.035 Fs dB Fs dB s tgd (Note 15) (-0.1 dB). (Note 15) 0 0.68 -92 9/Fs 0.45 0.035 Fs dB Fs dB s tgd (Note 15) (-0.1 dB). (Note 15) 0 0.58 -95 12/Fs 0.47 0.035 Fs dB Fs dB s (Note 17) Symbol Min Typ Max Unit
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DC ELECTRICAL CHARACTERISTICS
(GND = 0 V, all voltages with respect to ground. MCLK=12.288 MHz; Master Mode) Parameter Power Supply Power Supply Current (Normal Operation) Power Supply Current (Power-Down Mode)(Note 18) Power Consumption (Normal Operation) VA VL,VD = 5 V VL,VD = 3.3 V VA VL,VD=5 V VL, VD=5 V VL, VD = 3.3 V (Power-Down Mode) (Note 19) IA ID ID IA ID PSRR VQ FILT+ 45 41.5 24 0.025 1.76 433 305 9 60 0.48xVA 1 25 VA 0 VA 3 53 49 28 510 358 mA mA mA mA mA mW mW mW dB VDC A k VDC V V mA Symbol Min Typ Max Unit
Power Supply Rejection Ratio (1 kHz) Quiescent Voltage Nominal Quiescent Voltage Maximum DC Current Source/Sink from VQ VQ Output Impedance FILT+ FILT+ Nominal Voltage MUTEC MUTEC Low-Level Output Voltage MUTEC High-Level Output Voltage Maximum MUTEC Drive Current
Notes: 18. Power Down Mode is defined as RST = Low with all clocks and data lines held static. 19. Valid with the recommended capacitor values on FILT+ and VQ as shown in the Typical Connection Diagram.
DIGITAL CHARACTERISTICS
Parameter High-Level Input Voltage Low-Level Input Voltage High-Level Output Voltage at Io = 2 mA Low-Level Output Voltage at Io = 2 mA Input Leakage Current (% of VL) (% of VL) Symbol VIH VIL VOH VOL Iin Min 70% VL - 1.0 Typ Max 30% 0.4 10 Units V V V V A
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SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT (Logic "0" = GND = 0 V;
Logic "1" = VL, CL = 20 pF) Parameter Sample Rate Single Speed Mode Double Speed Mode Quad Speed Mode Stand-Alone Mode Control Port Mode Stand-Alone Mode Control Port Mode Symbol Fs Fs Fs fmclk fmclk tclkhl tclkhl Min 4 50 100 1.024 1.024 16 8 45 tslr tsdo tsdis tsdih -10 0 16 20 40 Single Speed Mode Double Speed Mode Quad Speed Mode SCLK Pulse Width High SCLK Pulse Width Low SCLK falling to LRCK edge SCLK falling to SDOUT valid SDIN valid to SCLK rising setup time SCLK rising to SDIN hold time Crystal Oscillator Specifications (XTI/XTO) Crystal Frequency Range fosc 16.384 25.600 MHz tsclkw tsclkw tsclkw tsclkh tsclkl tslr tsdo tsdis tsdih
1 -------------------( 128 )Fs 1 -------------------( 128 )Fs 1 ----------------( 64 )Fs
Typ 50 50 50 50 -
Max 50 100 200 25.600 51.200 55 10 32 60 10 32 -
Unit kHz kHz kHz MHz MHz ns ns % % % ns ns ns ns % s s s ns ns ns ns ns ns
MCLK Specifications MCLK Frequency (note 20) MCLK Input Pulse Width High/Low (note 20) MCLK Output Duty Cycle Master Mode LRCK Duty Cycle SCLK Duty Cycle SCLK falling to LRCK edge SCLK falling to SDOUT valid SDIN valid to SCLK rising setup time SCLK rising to SDIN hold time Slave Mode LRCK Duty Cycle SCLK Period (note 20)
30 48 -10 0 16 20
Notes: 20. In Control Port Mode, the Ratio[1:0] bits must be configured according to tables 8 and 9 on pages 28 and 29.
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LRCK O utput
t SCLK O utput t SDO UT
slr
sdo
t SDIN
sdis
t
sdih
Figure 1. Master Mode Serial Audio Port Timing
LRCK Input t sclkh t
t SCLK Input t SDOUT
slr
sclkl
t sdo
sclkw
t SDIN
sdis
t
sdih
Figure 2. Slave Mode Serial Audio Port Timing
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CS4271
LRCK SCLK
Left Channel
Right Channel
SDATA
MSB -1 -2 -3 -4 -5
+5 +4 +3 +2 +1 LSB
MSB -1 -2 -3 -4
+5 +4 +3 +2 +1 LSB
Figure 3. Format 0, Left Justified up to 24-Bit Data
LRCK SCLK
Left Channel
Right Channel
SDATA
MSB -1 -2 -3 -4 -5
+5 +4 +3 +2 +1 LSB
MSB -1 -2 -3 -4
+5 +4 +3 +2 +1 LSB
Figure 4. Format 1, IS up to 24-Bit Data
LRCK
Left Channel
R ight Channel
SCLK
SDATA
LS B
MS B-1 -2 -3 -4 -5 -6
B +6 +5 +4 +3 +2 +1 LS
MS -1 -2 -3 -4 -5 -6 B
B +6 +5 +4 +3 +2 +1 LS
32 clo cks
Figure 5. Format 2, Right Justified 16-Bit Data. (Available in Control Port Mode only) Format 3, Right Justified 24-Bit Data. (Available in Control Port Mode only) Format 4, Right Justified 20-Bit Data. (Available in Control Port Mode only) Format 5, Right Justified 18-Bit Data. (Available in Control Port Mode only)
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SWITCHING CHARACTERISTICS - IC MODE CONTROL PORT
(Inputs: logic 0 = AGND, logic 1 = VL)
Parameter IC Mode SCL Clock Frequency. RST Rising Edge to Start. Bus Free Time Between Transmissions. Start Condition Hold Time (prior to first clock pulse). Clock Low time. Clock High Time. Setup Time for Repeated Start Condition. SDA Hold Time from SCL Falling. SDA Setup time to SCL Rising. Rise Time of Both SDA and SCL Lines. Fall Time of Both SDA and SCL Lines. Setup Time for Stop Condition. (Note 21)
Symbol fscl tirs tbuf thdst tlow thigh tsust thdd tsud tr tf tsusp
Min 500 4.7 4.0 4.7 4.0 4.7 0 250 4.7
Max 100 1 300 -
Unit KHz ns s s s s s s ns s ns s
Notes: 21. Data must be held for sufficient time to bridge the 300 ns transition time of SCL.
RST t irs Stop SDA t buf
SCL Repeated Start
Start
Stop
t hdst
t high
t
hdst
tf
t susp
t
low
t
hdd
t sud
t sust
tr
Figure 6. IC Mode Control Port Timing
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CS4271
SWITCHING CHARACTERISTICS - SPI CONTROL PORT
(Inputs: logic 0 = AGND, logic 1 = VL)
Parameter SPI Mode CCLK Clock Frequency. RST Rising Edge to CS Falling. CCLK Edge to CS Falling. CS High Time Between Transmissions. CS Falling to CCLK Edge. CCLK Low Time. CCLK High Time. CDIN to CCLK Rising Setup Time. CCLK Rising to DATA Hold Time. Rise Time of CCLK and CDIN. Fall Time of CCLK and CDIN. (Note 23) (Note 24) (Note 24) (Note 22)
Symbol fsclk tsrs tspi tcsh tcss tscl tsch tdsu tdh tr2 tf2
Min 500 500 1.0 20 82 82 40 15 -
Max 6 100 100
Unit MHz ns ns s ns ns ns ns ns ns ns
Notes: 22. tspi only needed before first falling edge of CS after RST rising edge. tspi = 0 at all other times. 23. Data must be held for sufficient time to bridge the transition time of CCLK. 24. For FSCK < 1 MHz
RST
t srs
CS t spi t css CCLK t r2
CDIN
t scl
t sch
t csh
t f2
t dsu t dh
Figure 7. SPI Control Port Timing
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4. TYPICAL CONNECTION DIAGRAM
+5 V
0.1 F 1 F
* Only one must be used. See "Grounding and Power Supply Decoupling."
0.1 F
5.1
1 F
* VD VL
+5 V to 3.3 V * See "Master/Slave Mode Selection". +5 V to 2.5 V
0.1 F 1 F
Not to exceed 1 F. VA FILT+
47 F 0.1 F
AGND
1 F 0.1 F
CS4271
SDOUT (M/S) SDIN
47 k
VQ1 Audio Data Processor
Power Down and Mode Settings (Control Port)
AD0 / CS (I2S/LJ) SDA / CDIN (M1) SCL / CCLK (M0) RST
MCLK SCLK LRCK
Analog Input Buffer
AINA AINB VQ2 VQ3
Timing Logic & Clock
AOUTAAMUTEC AOUTA+ AOUTBBMUTEC AOUTB+ DGND Analog Conditioning & Mute
XTI
40 pF
** XTO
40 pF
** Optional. See "Crystal Applications (XTI/XTO)".
Figure 8. CS4271 Typical Connection Diagram
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CS4271
5. APPLICATIONS 5.1 5.1.1 Stand-Alone Mode Recommended Power-Up Sequence
1) When using the CS4271 with an external MCLK, hold RST low until the power supply, MCLK, and LRCK are stable. When using the CS4271 with internally generated MCLK, hold RST low until the power supply is stable. 2) Bring RST high. If the internally generated MCLK is being used, it will appear on the MCLK pin prior to 1 ms from the release of RST.
5.1.2
Master/Slave Mode
The CS4271 supports operation in either Master Mode or Slave Mode. In Master Mode, LRCK and SCLK are outputs and are synchronously generated on-chip. LRCK is equal to Fs and SCLK is equal to 64x Fs. In Slave Mode, LRCK and SCLK are inputs, requiring external generation that is synchronous to MCLK. It is recommended that SCLK be 64x Fs to maximize system performance. In Stand-Alone Mode, the CS4271 will default to Slave Mode. Master Mode may be accessed by placing a 47 k pull-up to VL on the SDOUT (M/S) pin. Configuration of clock ratios in each of these modes will be outlined in the Tables 3 and 4.
5.1.3
System Clocking
The CS4271 will operate at sampling frequencies from 4 kHz to 200 kHz. This range is divided into three speed modes as shown in Table 1 below. Table 1. Speed Modes Mode Single Speed Double Speed Quad Speed Sampling Frequency 4-50 kHz 50-100 kHz 100-200 kHz
5.1.3.1
Crystal Applications (XTI/XTO)
An external crystal may be used in conjunction with the CS4271 to generate the master clock signal. To accomplish this, a 20 pF fundamental mode parallel resonant crystal must be connected between the XTI and XTO pins as shown in the Typical Connection Diagram on page 23. This crystal must oscillate at the frequency shown in Table 2. In this configuration, MCLK is a buffered output and, as shown in the Typical Connection Diagram, nothing other than the crystal and its load capacitors should be connected to XTI and XTO. The MCLK signal will appear on the MCLK pin prior to 1 ms from the release of RST. Table 2. Crystal Frequencies Mode Single Speed Double Speed Quad Speed Crystal Frequency 512 x Fs 256 x Fs 128 x Fs
To operate the CS4271 with an externally generated MCLK signal, no crystal should be used, XTI should be connected to ground and XTO should be left unconnected. In this configuration, MCLK is an input and must be driven externally with an appropriate speed clock.
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5.1.3.2 Clock Ratio Selection
Depending on the use of an external crystal, or whether the CS4271 is in Master or Slave Mode, different MCKL/LRCK and SCLK/LRCK ratios may be used. These ratios are shown in the Tables 3 and 4 below. Table 3. Clock Ratios - Stand Alone Mode With External Crystal External Crystal Used, MCLK=Output Master Mode MCLK/LRCK Single Speed Double Speed Quad Speed 256 128 128 Slave Mode MCLK/LRCK Single Speed Double Speed Quad Speed 256 128 128 SCLK/LRCK 32, 64, 128 32, 64 32, 64 LRCK Fs Fs Fs SCLK/LRCK 64 64 64 LRCK Fs Fs Fs
Table 4. Clock Ratios - Stand Alone Mode Without External Crystal External Crystal Not Used, MCLK=Input Master Mode MCLK/LRCK Single Speed Double Speed Quad Speed 256 128 64 Slave Mode MCLK/LRCK 256 Single Speed 384 512 128 Double Speed 192 256 64 Quad Speed 96 128 SCLK/LRCK 32, 64, 128 32, 48, 64, 96, 128 32, 64, 128 32, 64 32, 48, 64 32, 64 32 48 32, 64 LRCK Fs Fs Fs Fs Fs Fs Fs Fs Fs SCLK/LRCK 64 64 32 LRCK Fs Fs Fs
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CS4271
5.1.4 16-Bit Auto-Dither
The CS4271 will auto-configure to output properly dithered 16-bit data when placed in Slave Mode and a 32x SCLK to LRCK ratio is used. In this configuration, one half of a bit of dither is added to the LSB of the 16-bit word. This applies only to the serial audio output of the ADC and will not affect DAC performance. See Figure 9.
1 6 -B it W o rd
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1/2 B it D ith e r
Figure 9. ADC 16-Bit Auto-Dither
5.1.5
Auto-Mute
The DAC output will mute following the reception of 8192 consecutive audio samples of static 0 or -1. A single sample of non-static data will release the mute. Detection and muting are done independently for each channel. The common mode on the output will be retained and the Mute Control pin for that channel will go active during the mute period.
5.1.6
High Pass Filter
The operational amplifiers in the input circuitry driving the CS4271 may generate a small DC offset into the ADC. The CS4271 includes a high pass filter after the decimator to remove any DC offset which could result in recording a DC level, possibly yielding "clicks" when switching between devices in a multichannel system. In Stand-Alone Mode, the high pass filter continuously subtracts a measure of the DC offset from the output of the decimation filter. This function cannot be disabled in Stand-Alone Mode.
5.1.7
Interpolation Filter
In Stand-Alone Mode, the fast roll-off interpolation filter is used. Filter specifications can be found in Section 3. Plots of the data are contained in the "Appendix" on page 47.
5.1.8
Mode Selection & De-Emphasis
The sample rate, Fs, can be adjusted from 4 kHz to 200 kHz. In Stand-Alone Mode, the CS4271 must be set to the proper mode via the mode pins, M1 and M0. De-emphasis, optimized for a 44.1 kHz sampling frequency, is available. Table 5. CS4271 Stand-Alone Mode Control Mode 1 0 0 1 1 Mode 0 0 1 0 1 Mode Single Speed Mode Single Speed Mode Double Speed Mode Quad Speed Mode Sample Rate (Fs) 4 kHz - 50 kHz 4 kHz - 50 kHz 50 kHz - 100 kHz 100 kHz - 200 kHz De-Emphasis 44.1 kHz Off Off Off
5.1.9
2
Serial Audio Interface Format Selection
Either I S or left justified serial audio data format may be selected in Stand-Alone Mode. The selection will affect both the input and output format. Placing a 10 k pull-up to VL on the I2S/LJ pin will select the I2S format, while placing a 10 k pull-down to DGND on the I2S/LJ pin will select the left justified format. 26 DS592F1
CS4271
5.2 5.2.1 Control Port Mode Recommended Power-Up Sequence - Access to Control Port Mode
1) When using the CS4271 with an external MCLK, hold RST low until the power supply, MCLK, and LRCK are stable. When using the CS4271 with internally generated MCLK, hold RST low until the power supply is stable. In this state, the Control Port is reset to its default settings. 2) Bring RST high. The device will remain in a low power state and the control port will be accessible. If internally generated MCLK is being used, it will appear on the MCLK pin prior to 1 ms from the release of RST. 3) Write 03h to register 07h within 10 ms following the release of RST. This sets the Control Port Enable (CPEN) and Power Down (PDN) bits, activating the Control Port and placing the part in power-down. When using the CS4271 with internally generated MCLK, it is necessary to wait 1 ms following the release of RST before initiating this Control Port write. 4) The desired register settings can be loaded while keeping the PDN bit set. 5) Clear the PDN bit to initiate the power-up sequence. This power-up sequence requires approximately 85 S.
5.2.2
Master / Slave Mode Selection
The CS4271 supports operation in either Master Mode or Slave Mode. In Master Mode, LRCK and SCLK are outputs and are synchronously generated on-chip. LRCK is equal to Fs and SCLK is equal to 64x Fs. In Slave Mode, LRCK and SCLK are inputs, requiring external generation that is synchronous to MCLK. It is recommended that SCLK be 64x Fs to maximize system performance. Configuration of clock ratios in each of these modes will be outlined in the Tables 8 and 9. In Control Port Mode the CS4271 will default to Slave Mode. The user may change this default setting by changing the status of the M/S bit in the Mode Control 1 register (01h).
5.2.3
System Clocking
The CS4271 will operate at sampling frequencies from 4 kHz to 200 kHz. This range is divided into three speed modes as shown in Table 6 below. Table 6. Speed Modes Mode Single Speed Double Speed Quad Speed Sampling Frequency 4-50 kHz 50-100 kHz 100-200 kHz
5.2.3.1
Crystal Applications (XTI/XTO)
An external crystal may be used in conjunction with the CS4271 to generate the MCLK signal. To accomplish this, a 20 pF fundamental mode parallel resonant crystal must be connected between the XTI and XTO pins as shown in the Typical Connection Diagram on page 23. This crystal must oscillate at the frequency shown in Table 7. In this configuration, MCLK is a buffered output and, as shown in the Typical Connection Diagram, nothing other than the crystal and its load capacitors should be connected to XTI and XTO. The MCLK signal will appear on the MCLK pin prior to 1 ms from the release of RST.
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CS4271
Table 7. Crystal Frequencies Mode Single Speed Double Speed Quad Speed Crystal Frequency 512 x Fs 256 x Fs 128 x Fs
To operate the CS4271 with an externally generated MCLK signal, no crystal should be used, XTI should be connected to ground and XTO should be left unconnected. In this configuration, MCLK is an input and must be driven externally with an appropriate speed clock.
5.2.3.2
Clock Ratio Selection
Depending on the use of an external crystal, or whether the CS4271 is in Master or Slave Mode, different MCKL/LRCK and SCLK/LRCK ratios may be used. These ratios as well as the Control Port Register Bits that must be set in order to obtain them are shown in Tables 8 and 9 below. Table 8. Clock Ratios - Control Port Mode With External Crystal External Crystal Used, MCLK=Output Master Mode MCLK/LRCK Single Speed 256 512 Double Speed Quad Speed 128 256 128 SCLK/LRCK 64 64 64 64 64 Slave Mode MCLK/LRCK Single Speed 256 512 Double Speed Quad Speed 128 256 128 SCLK/LRCK 32, 64, 128 32, 64, 128 32, 64 32, 64 32, 64 LRCK Fs Fs Fs Fs Fs Ratio1 Bit 0 1 0 1 d25 Ratio0 Bit d25 d25 d25 d25 d25 LRCK Fs Fs Fs Fs Fs Ratio1 Bit 0 1 0 1 d25 Ratio0 Bit d25 d25 d25 d25 d25
Notes: 25. For the Ratio1 and Ratio0 bits listed above, "d" indicates that any value may written.
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Table 9. Clock Ratios - Control Port Mode Without External Crystal External Crystal Not Used, MCLK=Input Master Mode MCLK/LRCK 256 Single Speed 384 512 768 128 Double Speed 192 256 384 64 Quad Speed 96 128 192 SCLK/LRCK 64 64 64 64 64 64 64 64 32 32 64 64 Slave Mode MCLK/LRCK 256 384 Single Speed 512 768 1024 128 192 Double Speed 256 384 512 64 96 Quad Speed 128 192 256 SCLK/LRCK 32, 64, 128 32, 48, 64, 96, 128 32, 64, 128 32, 48, 64, 96, 128 32, 64, 128 32, 64 32, 48, 64 32, 64 32, 48, 64 32, 64 32 48 32, 64 48 32, 64 LRCK Fs Fs Fs Fs Fs Fs Fs Fs Fs Fs Fs Fs Fs Fs Fs Ratio1 Bit 0 0 0 1 1 0 0 0 1 1 0 0 0 1 1 Ratio0 Bit d26 d26 d26 d26 d26 d26 d26 d26 d26 d26 d26 d26 d26 d26 d26 LRCK Fs Fs Fs Fs Fs Fs Fs Fs Fs Fs Fs Fs Ratio1 Bit 0 0 1 1 0 0 1 1 0 0 1 1 Ratio0 Bit 0 1 0 1 0 1 0 1 0 1 0 1
Notes: 26. For the Ratio0 bit listed above, "d" indicates that any value may written.
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5.2.4 Internal Digital Loopback
In Control Port Mode, the CS4271 supports an internal digital loopback mode in which the output of the ADC is routed to the input of the DAC. This mode may be activated by setting the LOOP bit in the Mode Control 2 register (07h). When this bit is set, the status of the DAC_DIF(2:0) bits in register 01h will be disregarded by the CS4271. Any changes made to the DAC_DIF(2:0) bits while the LOOP bit is set will have no impact on operation until the LOOP bit is released, at which time the Digital Interface Format of the DAC will operate according to the format selected in the DAC_DIF(2:0) bits. While the LOOP bit is set, data will be present on the SDOUT pin in the format selected in the ADC_DIF bit in register 06h.
5.2.5
Dither for 16-Bit Data
The CS4271 may be configured to properly dither for 16-bit data. To do this, the Dither16 bit in the ADC Control Register (06h) must be set. When set, a half bit of dither is added to the least significant bit of the 16 most significant bits of the data word. The remaining bits should be disregarded. See Figure 10. This function is useful when 16-bit devices are downstream of the ADC. This bit should not be set when using word lengths greater than 16 bits. It should be noted that this function is supported for all serial audio output formats, and may be activated in either Master or Slave Mode.
16-Bit W ord
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6
Disregard Contents
5 4 3 2 1 0
1/2 Bit Dither
Figure 10. Example of Dither for 16-Bit Data with 24-Bit Left Justified Format
5.2.6
Auto-Mute
The Auto-Mute function is controlled by the status of the AMUTE bit in the DAC Control register. When set, the DAC output will mute following the reception of 8192 consecutive audio samples of static 0 or -1. A single sample of nonstatic data will release the mute. Detection and muting are done independently for each channel. Auto-Mute detection and muting can become dependent on either channel if the MUTECA=B function is enabled. The common mode on the output will be retained and the Mute Control pin for that channel will become active during the mute period. The muting function is effected, similar to volume control changes, by the Soft and ZeroCross bits in the DAC Volume and Mixing Control register. The AMUTE bit is set by default.
5.2.7
High Pass Filter and DC Offset Calibration
The operational amplifiers in the input circuitry driving the CS4271 may generate a small DC offset into the A/D converter. The CS4271 includes a high pass filter after the decimator to remove any DC offset which could result in recording a DC level, possibly yielding "clicks" when switching between devices in a multichannel system. The high pass filter continuously subtracts a measure of the DC offset from the output of the decimation filter. The high pass filter can be independently enabled and disabled for channels A and B. If the HPFDisableA or HPFDisableB bit is set during normal operation, the current value of the DC offset for the corresponding channel is frozen and this DC offset will continue to be subtracted from the conversion result. This feature makes it possible to perform a system DC offset calibration by: 1) Running the CS4271 with the high pass filter enabled until the filter settles. See the Digital Filter Characteristics for filter settling time. 2) Disabling the high pass filter and freezing the stored DC offset.
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A system calibration performed in this way will eliminate offsets anywhere in the signal path between the calibration point and the CS4271.
5.2.8
Interpolation Filter
To accommodate the increasingly complex requirements of digital audio systems, the CS4271 incorporates selectable interpolation filters for each mode of operation. Fast and slow roll-off filters are available in each of Single, Double, and Quad Speed modes. These filters have been designed to accommodate a variety of musical tastes and styles. The FILT_SEL bit in the DAC Control register (02h) is used to select which filter is used. By default, the fast roll-off filter is selected. Filter specifications can be found in Section 3. Plots of the data are contained in the "Appendix" on page 47.
5.2.9
De-Emphasis
Three de-emphasis modes are available via the Control Port. The available filters are optimized for 32 kHz, 44.1 kHz, and 48 kHz sampling rates. See Table 13 for de-emphasis selection in Control Port Mode.
5.2.10 Oversampling Modes
The CS4271 operates in one of three oversampling modes based on the input sample rate. Mode selection is determined by the M1 and M0 bits in the Mode Control 1 register. Single-Speed mode supports input sample rates up to 50 kHz and uses a 128x oversampling ratio. Double-Speed mode supports input sample rates up to 100 kHz and uses an oversampling ratio of 64x. Quad-Speed mode supports input sample rates up to 200 kHz and uses an oversampling ratio of 32x. See Table 11 for Control Port Mode settings.
5.3
De-Emphasis Filter
The CS4271 includes on-chip digital de-emphasis. Figure 11 shows the de-emphasis curve for Fs equal to 44.1 kHz. The frequency response of the de-emphasis curve will scale proportionally with changes in sample rate, Fs. Please see section 5.1.8 for the desired de-emphasis control for Stand-Alone mode and section 5.2.9 for control port mode. The de-emphasis feature is included to accommodate audio recordings that utilize 50/15 S pre-emphasis equalization as a means of noise reduction. De-emphasis is only available in Single Speed Mode.
Gain dB T1=50 s 0dB
T2 = 15 s
-10dB
F1 3.183 kHz
F2 Frequency 10.61 kHz
Figure 11. De-Emphasis Curve
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5.4 5.4.1 Analog Connections Input Connections
The analog modulator samples the input at 6.144 MHz (MCLK=12.288 MHz). The digital filter will reject signals within the stopband of the filter. However, there is no rejection for input signals which are (n x 6.144 MHz) the digital passband frequency, where n=0,1,2,... Refer to Figure 12 for a recommended analog input buffer that will attenuate any noise energy at 6.144 MHz, in addition to providing the optimum source impedance for the modulators. The use of capacitors which have a large voltage coefficient (such as general purpose ceramics) must be avoided since these can degrade signal linearity. Figure 13 shows the full-scale analog input levels.
634 470 pF C0G 91 2700 pF C0G
CS4271 AINA VQ2
AINL
10 F 10 k
+
+
VQ1
1 F 0.1 F
10 k
AINR
10 F
+ 470 pF C0G 634 91
2700 pF C0G
VQ3 AINB
Figure 12. CS4271 Recommended Analog Input Buffer
CS4271
3.9 V 2.5 V 1.1 V 3.9 V 2.5 V 1.1 V AINB AINA
Full-Scale Input Level = 2.8 Vpp
Figure 13. Full-Scale Analog Input
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5.4.2 Output Connections
The recommended output filter configuration is shown in Figure 14. This filter configuration accounts for the normally differing AC loads on the AOUT+ and AOUT- differential output pins. It also shows an AC coupling configuration which minimizes the number of required AC coupling capacitors. The CS4271 does not include phase or amplitude compensation for an external filter, and therefore the DAC system phase and amplitude response will be dependent on the external analog circuitry. Figure 15 shows the full-scale analog output levels.
CS4271
2200 pF C0G
4.99 k 470 pF 2.32 k + 1.5 nF C0G 1.50 k 22 F C0G 22 F 560 47 k
AOUTAOUT+
4.42 k
Analog Out
1.33 k 6.8 nF C0G
715
Figure 14. CS4271 Recommended Analog Output Filter
CS4271
3.75 V AOUT+ 2.5 V 1.25 V 3.75 V AOUT2.5 V 1.25 V
Full-Scale Output Level= (AIN+) - (AIN-)= 5 Vpp
Figure 15. Full-Scale Analog Output
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CS4271
5.5 Mute Control
The Mute Control pins become active during power-up initialization, reset, muting, if the MCLK to LRCK ratio is incorrect, and during power-down. The Auto-Mute function causes the MUTEC pin corresponding to an individual channel to activate following the reception of 8192 consecutive audio samples of static 0 or -1 on the respective channel. A single sample of non-zero data on this channel will cause the MUTEC pin to deactivate. In Control Port Mode, however, auto-mute detection and muting can become dependent on either channel if the MuteB=A function is enabled. The MUTEC pins are intended to be used as control for an external mute circuit in order to add off-chip mute capability. Use of the Mute Control function is not mandatory but recommended for designs requiring the absolute minimum in extraneous clicks and pops. Also, use of the Mute Control function can enable the system designer to achieve idle channel noise/signal-to-noise ratios which are only limited by the external mute circuit. The MUTEC pins are activelow. See Figure 16 below for a suggested active-low mute circuit.
+VEE AC Couple AOUT LPF
560
Audio Out 47 k
-VEE CS4272 +VA MMUN2111LT1 MUTEC 2 k
10 k
-VEE
Figure 16. Suggested Active-Low Mute Circuit
5.6
Synchronization of Multiple Devices
In systems where multiple ADCs are required, care must be taken to achieve simultaneous sampling. To ensure synchronous sampling, the MCLK and LRCK must be the same for all of the CS4271's in the system. If only one MCLK source is needed, one solution is to place one CS4271 in Master Mode, and slave all of the other CS4271's to the one master. If multiple MCLK sources are needed, a possible solution would be to supply all clocks from the same external source and time the CS4271 reset with the inactive edge of MCLK. This will ensure that all converters begin sampling on the same clock edge.
5.7
Grounding and Power Supply Decoupling
As with any high resolution converter, the CS4271 requires careful attention to power supply and grounding arrangements if its potential performance is to be realized. Figure 8 shows the recommended power arrangements, with VA and VL connected to clean supplies. VD, which powers the digital filter, may be run from the system logic supply (VL) or may be powered from the analog supply (VA) via a resistor. In this case, no additional devices should be powered from VD. Power supply decoupling capacitors should be as near to the CS4271 as possible, with the low value ceramic capacitor being the nearest. All signals, especially clocks, should be kept away from the VREF and VCOM pins in order to avoid unwanted coupling into the modulators. The VREF and VCOM decoupling capacitors, particularly the 0.1 F, must be positioned to minimize the electrical path from VREF and AGND. The CDB4271 evaluation board demonstrates the optimum layout and power supply arrangements. To minimize digital noise, connect the CS4271 digital outputs only to CMOS inputs. 34 DS592F1
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6. CONTROL PORT INTERFACE
The Control Port is used to load all the internal settings of the CS4271. The operation of the Control Port may be completely asynchronous to the audio sample rate. However, to avoid potential interference problems, the Control Port pins should remain static if no operation is required. The Control Port has 2 modes: SPI and IC, with the CS4271 operating as a slave to control messages in both modes. If IC operation is desired, AD0/CS should be tied to VA or AGND. If the CS4271 ever detects a high to low transition on AD0/CS after power-up, SPI mode will be selected. The Control Port registers are write-only in SPI mode. Upon release of the RST pin, the CS4271 will wait approximately 10 ms before it begins its start-up sequence. The part defaults to Stand-Alone Mode, in which all operational modes are controlled as described under "Stand-Alone Mode" on page 24. The Control Port is active at all times, and if bit 1 of register 07h (CPEN) is set, the part enters Control-Port Mode and all operational modes are controlled by the Control Port registers. This bit can be set at any time, but to avoid unpredictable output noises, bit 1 (CPEN) and bit 0 (PDN) of register 07h should be set by writing 03h before the end of the 10 ms start-up wait period. All registers can then be set as desired before releasing the PDN bit to begin the start-up sequence. If system requirements do not allow writing to the control port immediately following the release of RST, the SDIN line should be held at logic "0" until the proper serial mode can be selected.
6.1
SPI Mode
In SPI mode, CS is the CS4271 chip select signal, CCLK is the control port bit clock, CDIN is the input data line from the microcontroller and the chip address is 0010000. All control signals are inputs and data is clocked in on the rising edge of CCLK. Figure 17 shows the operation of the Control Port in SPI mode. To write to a register, bring CS low. The first 7 bits on CDIN form the chip address, and must be 0010000. The eighth bit is a read/write indicator (R/W), which must be low to write. The next 8 bits form the Memory Address Pointer (MAP), which is set to the address of the register that is to be updated. The next 8 bits are the data which will be placed into the register designated by the MAP. See Table 10 on page 36.
CS CCLK CHIP ADDRESS CDIN
0010000
R/W
MAP
MSB
DATA
LSB
byte 1 MAP = Memory Address Pointer
byte n
Figure 17. Control Port Timing, SPI mode
The CS4271 has MAP auto increment capability, enabled by the INCR bit in the MAP. If INCR is 0, then the MAP will stay constant for successive writes. If INCR is set, then MAP will auto increment after each byte is written, allowing block writes to successive registers.
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6.2
IC Mode
In IC mode, SDA is a bi-directional data line. Data is clocked into and out of the part by the clock, SCL, with the clock to data relationship as shown in Figure 18. There is no CS pin. Pin AD0 forms the partial chip address and should be tied to VA or AGND as required. The upper 6 bits of the 7-bit address field must be 001000. To communicate with the CS4271, the LSB of the chip address field, which is the first byte sent to the CS4271, should match the setting of the AD0 pin. The eighth bit of the address byte is the R/W bit (high for a read, low for a write). If the operation is a write, the next byte is the Memory Address Pointer, MAP, which selects the register to be read or written. The MAP is then followed by the data to be written. If the operation is a read, then the contents of the register pointed to by the MAP will be output after the chip address. The CS4271 has MAP auto increment capability, enabled by the INCR bit in the MAP. If INCR is 0, then the MAP will stay constant for successive writes. If INCR is set, then MAP will auto increment after each byte is written, allowing block reads or writes of successive registers.
Note 1 SDA
001000 ADDR AD0 R/W ACK DATA 1-8 ACK DATA 1-8 ACK
SCL Start Stop
Note: If operation is a write, this byte contains the Memory Address Pointer, MAP.
Figure 18. Control Port Timing, IC Mode
Table 10. Memory Address Pointer (MAP)
7 INCR 0 6 Reserved 0 5 Reserved 0 4 Reserved 0 3 MAP3 0 2 MAP2 0 1 MAP1 0 0 MAP0 0
INCR - Auto MAP Increment Enable Default = `0'. 0 - Disabled 1 - Enabled MAP(3:0) - Memory Address Pointer Default = `0000'.
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7. REGISTER QUICK REFERENCE
This table shows the register names and their associated default values. Addr Function 7
M1 0 02h DAC Control 1 03h DAC Volume & Reserved Mixing Control 0 04h DAC Ch A Volume Control 05h DAC Ch B Volume Control 06h ADC Control MUTE 0 MUTE 0 0 0 08h Chip ID PART3 0
6
M0 0 0 B=A 0 VOL6 0 VOL6 0 0 0 PART2 0
5
Ratio1 0 DEM1 0 Soft 1 VOL5 0 VOL5 0 Dither16 0 0 PART1 0
4
Ratio0 0 DEM0 0 ZeroCross 0 VOL4 0 VOL4 0 ADC_DIF0 0 LOOP 0 PART0 0
3
M/S 0 RMP_UP 0 ATAPI3 1 VOL3 0 VOL3 0 MUTEA 0 0 REV3 0
2
DAC_DIF2 0 RMP_DN 0 ATAPI2 0 VOL2 0 VOL2 0 MUTEB 0 0 REV2 0
1
DAC_DIF1 0 INV_B 0 ATAPI1 0 VOL1 0 VOL1 0 0 CPEN 0 REV1 0
0
DAC_DIF0 0 INV_A 0 ATAPI0 1 VOL0 0 VOL0 0 0 PDN 0 REV0 0
01h Mode Control 1
AMUTE FILT_SEL
Reserved Reserved
HPFDisableA HPFDisableB
07h Mode Control 2 Reserved Reserved Reserved
MUTECA=B FREEZE
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8. 8.1 REGISTER DESCRIPTION Mode Control 1 - Address 01h
7 M1 6 M0 5 Ratio1 4 Ratio0 3 M/S 2 DAC_DIF2 1 DAC_DIF1 0 DAC_DIF0
** All registers are read/write in IC mode and write only in SPI mode, unless otherwise noted**
8.1.1
Functional Mode (Bits 7:6)
Function:
Selects the required range of input sample rates. Table 11. Functional Mode Selection M1 0 0 1 1 M0 0 1 0 1 Mode Single-Speed Mode: 4 to 50 kHz sample rates (default) Single-Speed Mode: 4 to 50 kHz sample rates Double-Speed Mode: 50 to 100 kHz sample rates Quad-Speed Mode: 100 to 200 kHz sample rates
8.1.2
Ratio Select (Bits 5:4)
Function:
These bits are used to select the clocking ratios in Control Port Mode. Please refer to Table 8, "Clock Ratios - Control Port Mode With External Crystal," on page 28 or Table 9, "Clock Ratios - Control Port Mode Without External Crystal," on page 29 for information on which of these bits to set to obtain specific clock ratios.
8.1.3
Master / Slave Mode (Bit 3)
Function:
This bit selects either master or slave operation. Setting this bit will select master mode, while clearing this bit will select slave mode.
8.1.4
DAC Digital Interface Format (Bits 2:0)
Function:
The required relationship between LRCK, SCLK and SDIN for the DAC is defined by the DAC Digital Interface Format and the options are detailed in Table 12 and Figures 3-5. Table 12. DAC Digital Interface Formats
DAC_DIF2 DAC_DIF1 DAC_DIF0 0 0 0 0 0 1 0 0 1 1 1 1 1 1 0 0 1 1 0 1 0 1 0 1
Description Left Justified, up to 24-bit data (default) I2S, up to 24-bit data Right Justified, 16-bit Data Right Justified, 24-bit Data Right Justified, 20-bit Data Right Justified, 18-bit Data Reserved Reserved
Format 0 1 2 3 4 5
Figure 3 4 5 5 5 5
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8.2 DAC Control - Address 02h
6 FILT_SEL 5 DEM1 4 DEM0 3 RMP_UP 2 RMP_DN 1 INV_A 0 INV_B
7 AMUTE
8.2.1
Auto-Mute (Bit 7)
Function:
When set, enables the Auto-Mute function. See "Auto-Mute" on page 30.
8.2.2
Interpolation Filter Select (Bit 6)
Function:
This Function allows the user to select whether the Interpolation Filter has a fast or slow roll off. When set, this bit selects the slow roll off filter, when cleared it selects the fast roll off filter. The - 3 dB corner is approximately the same for both filters, but the slope of the roll off is greater for the fast roll off filter.
8.2.3
De-Emphasis Control (Bits 5:4)
Function:
Implementation of the standard 50/15 s digital de-emphasis filter response, Figure 19, requires reconfiguration of the digital filter to maintain the proper filter response for 32, 44.1 or 48 kHz sample rates. NOTE: De-emphasis is available only in Single-Speed Mode. See Table 13 below. Table 13. De-Emphasis Mode Selection DEM1 0 0 1 1
Gain dB T1=50 s 0dB
DEM0 0 1 0 1
Description Disabled (default) 44.1 kHz de-emphasis 48 kHz de-emphasis 32 kHz de-emphasis
T2 = 15 s
-10dB
F1 3.183 kHz
F2 Frequency 10.61 kHz
Figure 19. De-Emphasis Curve
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8.2.4 Soft Volume Ramp-Up After Error (Bit 3)
Function:
An un-mute will be performed after executing a filter mode change, after a MCLK/LRCK ratio change or error, and after changing the Functional Mode. When this bit is set, this un-mute is effected, similar to attenuation changes, by the Soft and ZeroCross bits in the DAC Volume & Mixing Control register. When cleared, an immediate un-mute is performed in these instances. Note: For best results, it is recommended that this feature be used with the RMP_DN bit.
8.2.5
Soft Ramp-Down Before Filter Mode Change (Bit 2)
Function:
A mute will be performed prior to executing a filter mode change. When this bit is set, this mute is effected, similar to attenuation changes, by the Soft and ZeroCross bits in the DAC Volume & Mixing Control register. When cleared, an immediate mute is performed prior to executing a filter mode change. Note: For best results, it is recommended that this feature be used in conjunction with the RMP_UP bit.
8.2.6
Invert Signal Polarity (Bits 1:0)
Function:
When set, this bit activates an inversion of the signal polarity for the appropriate channel. This is useful if a board layout error has occurred, or other situations where a 180 degree phase shift is desirable.
8.3
DAC Volume & Mixing Control - Address 03h
6 B=A 5 Soft 4 ZeroCross 3 ATAPI3 2 ATAPI2 1 ATAPI1 0 ATAPI0
7 Reserved
8.3.1
Channel B Volume = Channel A Volume (Bit 6)
Function:
The AOUTA and AOUTB volume levels are independently controlled by the A and the B Channel Volume Control Bytes when this function is disabled. The volume on both AOUTA and AOUTB are determined by the A Channel Volume Control Byte and the B Channel Byte is ignored when this function is enabled. Volume and muting functions are effected by the Soft Ramp and ZeroCross functions below.
8.3.2
Soft Ramp or Zero Cross Enable (Bits 5:4)
Function:
Soft Ramp Enable Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally ramping, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock periods. See Table 14 on page 41. Zero Cross Enable Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will occur on a signal zero crossing to minimize audible artifacts. The requested level change will occur after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is independently mon-
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itored and implemented for each channel. See Table 14 on page 41. Soft Ramp and Zero Cross Enable Soft Ramp and Zero Cross Enable dictate that signal level changes, either by attenuation changes or muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level change will occur after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is independently monitored and implemented for each channel. See Table 14 on page 41. Table 14. Soft Cross or Zero Cross Mode Selection Soft 0 0 1 1 ZeroCross 0 1 0 1 Mode Changes to affect immediately Zero Cross enabled Soft Ramp enabled (default) Soft Ramp and Zero Cross enabled
8.3.3
ATAPI Channel Mixing and Muting (Bits 3:0)
Function:
The CS4271 implements the channel mixing functions of the ATAPI CD-ROM specification. See Table 15 on page 42
Left Channel Audio Data
A Channel Volume Control
AoutA
Right Channel Audio Data
B Channel Volume Control
AoutB
Figure 20. ATAPI Block Diagram
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Table 15. ATAPI Decode ATAPI3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 ATAPI2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 ATAPI1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 ATAPI0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 AOUTA MUTE MUTE MUTE MUTE aR aR aR aR aL aL aL aL a[(L+R)/2] a[(L+R)/2] a[(L+R)/2] a[(L+R)/2] AOUTB MUTE bR bL b[(L+R)/2] MUTE bR bL b[(L+R)/2] MUTE bR bL b[(L+R)/2] MUTE bR bL b[(L+R)/2]
8.4 8.5
DAC Channel A Volume Control - Address 04h
See 8.5 DAC Channel B Volume Control - Address 05h
DAC Channel B Volume Control - Address 05h
7 MUTE 6 VOL6 5 VOL5 4 VOL4 3 VOL3 2 VOL2 1 VOL1 0 VOL0
8.5.1
Mute (Bit 7)
Function:
The DAC output will mute when this bit is set. Though this bit is active high, it should be noted that the MUTEC pins are active low. The common mode voltage on the output will be retained when this bit is set. The muting function is effected, similar to attenuation changes, by the Soft and ZeroCross bits in the Volume and Mixing Control register. The MUTEC pin for the respective channel will become active during the mute period if the MUTE bit is set. Both the AMUTEC and BMUTEC will become active if either MUTE register is enabled and the MUTECB=A bit (register 7) is enabled.
8.5.2
Volume Control (Bits 6:0)
Function:
The digital volume control allows the user to attenuate the signal in 1 dB increments from 0 to -127 dB. Volume settings are decoded as shown in Table 16. The volume changes are implemented as dictated by the Soft and ZeroCross bits in the DAC Volume & Mixing Control register (see section 8.3.2). Table 16. Digital Volume Control Example Settings Binary Code 0000000 0010100 0101000 0111100 1011010 Decimal Value 0 20 40 60 90 Volume Setting 0 dB -20 dB -40 dB -60 dB -90 dB
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8.6 ADC Control - Address 06h
6 Reserved 5 Dither16 4 ADC_DIF 3 MUTEA 2 MUTEB 1 HPFDisableA 0 HPFDisableB
7 Reserved
8.6.1
Dither for 16-Bit Data (Bit 5)
Function:
When set, this bit activates the Dither for 16-Bit Data feature as described in "Dither for 16-Bit Data" on page 30.
8.6.2
ADC Digital Interface Format (Bit 4)
Function:
The required relationship between LRCK, SCLK and SDOUT for the ADC is defined by the ADC Digital Interface Format. The options are detailed in Table 17 and may be seen in Figure 3 and 4. Table 17. ADC Digital Interface Formats ADC_DIF 0 1 Description Left Justified, up to 24-bit data (default) I2S, up to 24-bit data Format 0 1 Figure 3 4
8.6.3
ADC Channel A & B Mute (Bits 3:2)
Function:
When this bit is set, the output of the ADC for the selected channel will be muted.
8.6.4
Channel A & B High Pass Filter Disable (Bits 1:0)
Function:
When this bit is set, the internal high-pass filter for the selected channel will be disabled.The current DC offset value will be frozen and continue to be subtracted from the conversion result. See "High Pass Filter and DC Offset Calibration" on page 30.
8.7
Mode Control 2 - Address 07h
6 Reserved 5 Reserved 4 LOOP 3 MUTECA=B 2 FREEZE 1 CPEN 0 PDN
7 Reserved
8.7.1
Digital Loopback (Bit 4)
Function:
When this bit is set, an internal digital loopback from the ADC to the DAC will be enabled. Please refer to "Internal Digital Loopback" on page 30.
8.7.2
AMUTEC = BMUTEC (Bit 3)
Function:
When this function is enabled, the individual controls for AMUTEC and BMUTEC are internally connected through an AND gate prior to the output pins. Therefore, the external AMUTEC and BMUTEC pins will go active only when the requirements for both AMUTEC and BMUTEC are valid.
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8.7.3 Freeze (Bit 2)
Function:
This function allows modifications to the control port registers without the changes taking effect until FREEZE is disabled. To make multiple changes in the Control Port registers take effect simultaneously, set the FREEZE bit, make all register changes, then clear the FREEZE bit.
8.7.4
Control Port Enable (Bit 1)
Function:
This bit is cleared by default, allowing the device to power-up in Stand-Alone Mode. Control Port Mode can be accessed by setting this bit. This will allow the operation of the device to be controlled by the registers and the pin definitions will conform to Control Port Mode. See "Recommended PowerUp Sequence - Access to Control Port Mode" on page 27.
8.7.5
Power Down (Bit 0)
Function:
The device will enter a low-power state whenever this bit is set. The power-down bit is set by default and must be cleared before normal operation in Control Port Mode can occur. The contents of the control registers are retained when the device is in power-down.
8.8
Chip ID - Register 08h
B6 PART2 B5 PART1 B4 PART0 B3 REV3 B2 REV2 B1 REV1 B0 REV0
B7 PART3
This is a Read-Only register.
8.8.1
Chip ID (Bits 7:4)
Function:
Chip ID code for the CS4271. Permanently set to 0000b (0h).
8.8.2
Chip Revision (Bits 3:0)
Function:
Chip Revision code for the CS4271. Revision A is coded as 0000b (0h). Revision B is coded as 0000b (0h).
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9. PARAMETER DEFINITIONS
The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified bandwidth. Dynamic Range is a signal-to-noise ratio measurement over the specified bandwidth made with a -60 dBFS signal. 60 dB is added to resulting measurement to refer the measurement to full-scale. This technique ensures that the distortion components are below the noise level and do not affect the measurement. This measurement technique has been accepted by the Audio Engineering Society, AES17-1991, and the Electronic Industries Association of Japan, EIAJ CP-307. Expressed in decibels. Total Harmonic Distortion + Noise The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified bandwidth (typically 10 Hz to 20 kHz), including distortion components. Expressed in decibels. Measured at -1 and -20 dBFS as suggested in AES17-1991 Annex A. Frequency Response A measure of the amplitude response variation from 10 Hz to 20 kHz relative to the amplitude response at 1 kHz. Units in decibels. Interchannel Isolation A measure of crosstalk between the left and right channels. Measured for each channel at the converter's output with no signal to the input under test and a full-scale signal applied to the other channel. Units in decibels. Interchannel Gain Mismatch The gain difference between left and right channels. Units in decibels. Gain Error The deviation from the nominal full-scale analog output for a full-scale digital input. Gain Drift The change in gain value with temperature. Units in ppm/C. Offset Error The deviation of the mid-scale transition (111...111 to 000...000) from the ideal. Units in mV.
Dynamic Range
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10.PACKAGE DIMENSIONS
28L TSSOP (4.4 mm BODY) PACKAGE DRAWING
N
D
E11 A2 A1
L
E
A
e b2 SIDE VIEW
123
END VIEW
SEATING PLANE
TOP VIEW
DIM A A1 A2 b D E E1 e L
MIN -0.002 0.03150 0.00748 0.378 BSC 0.248 0.169 -0.020 0
INCHES NOM -0.004 0.035 0.0096 0.382 BSC 0.2519 0.1732 0.026 BSC 0.024 4
MAX 0.47 0.006 0.04 0.012 0.386 BSC 0.256 0.177 -0.029 8
MIN -0.05 0.80 0.19 9.60 BSC 6.30 4.30 -0.50 0
MILLIMETERS NOM -0.10 0.90 0.245 9.70 BSC 6.40 4.40 0.65 BSC 0.60 4
NOTE MAX 1.20 0.15 1.00 0.30 9.80 BSC 6.50 4.50 -0.75 8
2,3 1 1
JEDEC #: MO-153 Controlling Dimension is Millimeters. Notes: 1. "D" and "E1" are reference datums and do not included mold flash or protrusions, but do include mold mismatch and are measured at the parting line, mold flash or protrusions shall not exceed 0.20 mm per side. 2. Dimension "b" does not include dambar protrusion/intrusion. Allowable dambar protrusion shall be 0.13 mm total in excess of "b" dimension at maximum material condition. Dambar intrusion shall not reduce dimension "b" by more than 0.07 mm at least material condition. 3. These dimensions apply to the flat section of the lead between 0.10 and 0.25 mm from lead tips.
THERMAL CHARACTERISTICS AND SPECIFICATIONS
Parameters Package Thermal Resistance (Note 4) Allowable Junction Temperature Symbol 28-TSSOP JA JC Min Typ 37 13 Max 135 Units C/Watt C/Watt C
Notes: 4. JA is specified according to JEDEC specifications for multi-layer PCBs.
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11.APPENDIX
0
0
20
20
Amplitude (dB)
Amplitude (dB)
40
40
60
60
80
80
100
100
120
120
0.4
0.5
0.6 0.7 0.8 Frequency(normalized to Fs)
0.9
1
0.4
0.42
0.44
0.46
0.48 0.5 0.52 Frequency(normalized to Fs)
0.54
0.56
0.58
0.6
Figure 21. DAC Single Speed (fast) Stopband Rejection
0
Figure 22. DAC Single Speed (fast) Transition Band
0.02
1
0.015
2
0.01
3
0.005 Amplitude (dB)
Amplitude (dB)
4
5
0
6
0.005
7
0.01
8
0.015
9
10 0.45
0.46
0.47
0.48
0.49 0.5 0.51 Frequency(normalized to Fs)
0.52
0.53
0.54
0.55
0.02
0
0.05
0.1
0.15
0.2 0.25 0.3 Frequency(normalized to Fs)
0.35
0.4
0.45
0.5
Figure 23. DAC Single Speed (fast) Transition Band (detail)
Figure 24. DAC Single Speed (fast) Passband Ripple
0
0
20
20
Amplitude (dB)
40
60
Amplitude (dB)
0.4 0.5 0.6 0.7 0.8 Frequency(normalized to Fs) 0.9 1
40
60
80
80
100
100
120
120
0.4
0.42
0.44
0.46
0.48 0.5 0.52 Frequency(normalized to Fs)
0.54
0.56
0.58
0.6
Figure 25. DAC Single Speed (slow) Stopband Rejection
Figure 26. DAC Single Speed (slow) Transition Band
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0
0.02
1
0.015
2
0.01
3
0.005
Amplitude (dB)
Amplitude (dB)
4
5
0
6
0.005
7
0.01
8
0.015
9
10 0.45
0.02
0.46 0.47 0.48 0.49 0.5 0.51 Frequency(normalized to Fs) 0.52 0.53 0.54 0.55
0
0.05
0.1
0.15
0.2 0.25 0.3 Frequency(normalized to Fs)
0.35
0.4
0.45
0.5
Figure 27. DAC Single Speed (slow) Transition Band (detail)
Figure 28. DAC Single Speed (slow) Passband Ripple
0
0
20
20
Amplitude (dB)
Amplitude (dB)
40
40
60
60
80
80
100
100
120
120
0.4
0.5
0.6 0.7 0.8 Frequency(normalized to Fs)
0.9
1
0.4
0.42
0.44
0.46
0.48 0.5 0.52 Frequency(normalized to Fs)
0.54
0.56
0.58
0.6
Figure 29. DAC Double Speed (fast) Stopband Rejection
0
Figure 30. DAC Double Speed (fast) Transition Band
0.02
1
0.015
2
0.01
3
Amplitude (dB)
5
Amplitude (dB)
4
0.005
0
6
0.005
7
0.01
8
9
0.015
10 0.45
0.46
0.47
0.48
0.49 0.5 0.51 Frequency(normalized to Fs)
0.52
0.53
0.54
0.55
0.02
0
0.05
0.1
0.15
0.2 0.25 0.3 Frequency(normalized to Fs)
0.35
0.4
0.45
0.5
Figure 31. DAC Double Speed (fast) Transition Band (detail)
Figure 32. DAC Double Speed (fast) Passband Ripple
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0
0
20
20
Amplitude (dB)
Amplitude (dB)
40
40
60
60
80
80
100
100
120
120
0.2
0.3
0.4
0.5 0.6 0.7 Frequency(normalized to Fs)
0.8
0.9
1
0.2
0.3
0.4 0.5 0.6 Frequency(normalized to Fs)
0.7
0.8
Figure 33. DAC Double Speed (slow) Stopband Rejection
0
Figure 34. DAC Double Speed (slow) Transition Band
0.02
1
0.015
2
0.01
3
0.005 Amplitude (dB)
Amplitude (dB)
4
5
0
6
0.005
7
0.01
8
0.015
9
10 0.45
0.46
0.47
0.48
0.49 0.5 0.51 Frequency(normalized to Fs)
0.52
0.53
0.54
0.55
0.02
0
0.05
0.1
0.15 0.2 Frequency(normalized to Fs)
0.25
0.3
0.35
Figure 35. DAC Double Speed (slow) Transition Band (detail)
Figure 36. DAC Double Speed (slow) Passband Ripple
0
0
20
20
40 Amplitude (dB)
Amplitude (dB)
40
60
60
80
80
100
100
120
120
0.2
0.3
0.4
0.5 0.6 0.7 Frequency(normalized to Fs)
0.8
0.9
1
0.2
0.3
0.4 0.5 0.6 Frequency(normalized to Fs)
0.7
0.8
Figure 37. DAC Quad Speed (fast) Stopband Rejection
Figure 38. DAC Quad Speed (fast) Transition Band
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0
0.2
1
0.15
2
0.1
3
0.05
Amplitude (dB)
Amplitude (dB) 0.05 0.1 0.15 0.2
4
5
0
6
7
8
9
10 0.45
0.46
0.47
0.48
0.49 0.5 0.51 Frequency(normalized to Fs)
0.52
0.53
0.54
0.55
0
0.05
0.1 0.15 Frequency(normalized to Fs)
0.2
0.25
Figure 39. DAC Quad Speed (fast) Transition Band (detail)
Figure 40. DAC Quad Speed (fast) Passband Ripple
0
0
20
20
Amplitude (dB)
Amplitude (dB)
40
40
60
60
80
80
100
100
120
120
0.1
0.2
0.3
0.4 0.5 0.6 0.7 Frequency(normalized to Fs)
0.8
0.9
1
0.1
0.2
0.3
0.4 0.5 0.6 Frequency(normalized to Fs)
0.7
0.8
0.9
Figure 41. DAC Quad Speed (slow) Stopband Rejection
0
Figure 42. DAC Quad Speed (slow) Transition Band
0.02
1
0.015
2
0.01
3
0.005 Amplitude (dB)
Amplitude (dB)
4
5
0
6
0.005
7
0.01
8
0.015
9
10 0.45
0.46
0.47
0.48
0.49 0.5 0.51 Frequency(normalized to Fs)
0.52
0.53
0.54
0.55
0.02
0
0.02
0.04 0.06 0.08 Frequency(normalized to Fs)
0.1
0.12
Figure 43. DAC Quad Speed (slow) Transition Band (detail)
Figure 44. DAC Quad Speed (slow) Passband Ripple
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0 -10 -20 -30 -40 -50 Amplitude (dB) -60 -70 -80 -90 -100 -110 -120 -130 -140 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Frequency (normalized to Fs)
0 -10 -20 -30 -40 -50 Amplitude (dB) -60 -70 -80 -90 -100 -110 -120 -130 -140 0.40
0.42
0.44
0.46
0.48
0.50
0.52
0.54
0.56
0.58
0.60
Frequency (normalized to Fs)
Figure 45. ADC Single Speed Mode Stopband Rejection
Figure 46. ADC Single Speed Mode Transition Band
0
0.10
-1
0.08
-2
0.05
-3
Amplitude (dB)
-5
Amplitude (dB)
0.46 0.47 0.48 0.49 0.50 0.51 0.52 0.53 0.54 0.55
-4
0.03
0.00
-6
-0.03
-7
-0.05
-8
-9
-0.08
-10 0.45
Frequency (normalized to Fs)
-0.10 0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Frequency (normalized to Fs)
Figure 47. ADC Single Speed Mode Transition Band (Detail)
Figure 48. ADC Single Speed Mode Passband Ripple
0 -10 -20 -30 -40 -50 Amplitude (dB)
0 -10 -20 -30 -40 -50 Amplitude (dB) -60 -70 -80 -90 -100 -110 -120 -130 -140 0.40
-60 -70 -80 -90 -100 -110 -120 -130 -140 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Frequency (normalized to Fs)
0.43
0.45
0.48
0.50
0.53
0.55
0.58
0.60
0.63
0.65
0.68
0.70
Frequency (normalized to Fs)
Figure 49. ADC Double Speed Mode Stopband Rejection
Figure 50. ADC Double Speed Mode Transition Band
DS592F1
51
CS4271
0
0.10
-1
0.08
-2
0.05
-3
Amplitude (dB)
-5
Amplitude (dB)
0.43 0.45 0.48 Frequency (normalized to Fs) 0.50 0.53 0.55
-4
0.03
0.00
-6
-0.03
-7
-8
-0.05
-9
-0.08
-10 0.40
-0.10 0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Frequency (normalized to Fs)
Figure 51. ADC Double Speed Mode Transition Band (Detail)
Figure 52. ADC Double Speed Mode Passband Ripple
0 -10 -20 -30 -40 Amplitude (dB) -50 -60 -70 -80
Amplitude (dB)
0 -10 -20 -30 -40 -50 -60 -70 -80 -90
-90 -100 -110 -120 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Frequency (normalized to Fs)
-100 -110 -120 -130 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 Frequency (normalized to Fs)
Figure 53. ADC Quad Speed Mode Stopband Rejection
Figure 54. ADC Quad Speed Mode Transition Band
0
0.10
-1
0.08
-2
0.06
-3
0.04
Amplitude (dB)
-5
Amplitude (dB)
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6
-4
0.02
0.00
-6
-0.02
-7
-0.04
-8
-0.06
-9
-0.08
-10 Frequency (normalized to Fs)
-0.10 0.00
0.05
0.10
0.15
0.20
0.25
Frequency (normalized to Fs)
Figure 55. ADC Quad Speed Mode Transition Band (Detail)
Figure 56. ADC Quad Speed Mode Passband Ripple
52
DS592F1
CS4271
Table 18. Revision History Release A1 PP1 PP2 Date January 2003 March 2003 October 2003 Changes Advance Release Preliminary Release - Corrected the description of pins 17 and 18 on page 6. - Corrected the description of pins 17 and 18 on page 8. - Updated Figure 8 on page 23. - Updated Table 9 on page 29. - Updated the DC Electrical Characteristics table on page 17. - Updated the DAC Analog Filter Response tables on pages 10 and 11. - Updated the ADC Digital Filter Characteristics table on page 16. - Updated the DAC Full Scale Differential Output Voltage specification on pages 10 and 11. Add lead-free device ordering info. Final Release - Updated Ordering Information on page 2. - Updated Specified Operating Conditions table on page 9 to reflect orderingsuffix independent temperature grade information. - Updated DAC Analog Characteristics tables on pages 10 and 11 to reflect ordering-suffix independent temperature grade information. - Updated ADC Analog Characteristics tables on pages 14 and 15 to reflect ordering-suffix independent temperature grade information. - Updated the DC Electrical Characteristics table on page 17. - Corrected error in the SCLK Period units shown in the Switching Characteristics - Serial Audio Port table on page 18. - Corrected error in the Memory Address Pointer table on page 36. - Updated Chip ID register description on page 44.
PP3 F1
September 2004 August 2005
Contacting Cirrus Logic Support
For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one nearest you go to www.cirrus.com
IIMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. Cirrus Logic, Cirrus, and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners. SPI is a trademark of Motorola, Inc.
DS592F1
53

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