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stereo, 24-bit, 192 khz, multibit, sigma-delta dac ad1852 rev. a information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2000C2009 analog devices, inc. all rights reserved. features 5 v stereo audio dac system accepts 16-bit/18-bit/20-bit/24-bit data supports 24 bits, 192 khz sample rate accepts a wide range of sample rates including 32 khz, 44.1 khz, 48 khz, 88.2 khz, 96 khz, and 192 khz multibit - modulator with perfect differential linearity restoration for reduced idle tones and noise floor data-directed scrambling dacleast sensitive to jitter differential output for optimum performance 117 db signal-to-noise (not muted) at 48 khz sample rate (a-weighted mono) 114 db signal-to-noise (not muted) at 48 khz sample rate (a-weighted stereo) 117 db dynamic range (not muted) at 48 khz sample rate (a-weighted mono) 114 db dynamic range (not muted) at 48 khz sample rate (a-weighted stereo) ?105 db thd+n (mono application circuit) ?102 db thd+n (stereo) 115 db stop-band attenuation on-chip clickless volume control hardware and software controllable clickless mute serial (spi) control for: serial mode, number of bits, sample rate, volume, mute, de-emp digital de-emphasis processing for 32 khz, 44.1 khz, 48 khz sample rates clock autodivide circuit supports five master-clock frequencies flexible serial data port with right-justified, left-justified, i 2 s-compatible and dsp serial port modes 28-lead ssop plastic package applications high end dvds, cds, home theater systems, automotive, audio systems, sampling musical keyboards, digital mixing consoles, and digital audio effects processors general description the ad1852 is a complete, high performance, single-chip, stereo digital, audio playback system. it is comprised of a multibit, - modulator, digital interpolation filters, and analog output drive circuitry. other features include an on-chip, stereo attenuator and mute, programmed through an spi-compatible serial control port. the ad1852 is fully compatible with all known dvd formats, including 192 khz, as well as 96 khz sample frequencies and 24 bits. it is also backwards compatible by supporting 50 s/15 s digital de-emphasis intended for red book compact discs, as well as de-emphasis at 32 khz and 48 khz sample rate. the ad1852 has a very simple, but very flexible, serial data input port that allows for glueless interconnection to a variety of adcs, dsp chips, aes/ebu receivers, and sample rate converters. the ad1852 can be configured in left-justified, i 2 s, right-justified, or dsp serial port compatible modes. it can support 16, 18, 20, and 24 bits in all modes. the ad1852 accepts serial audio data in msb first, twos-complement format. the ad1852 operates from a single 5 v power supply. it is fabricated on a single, monolithic integrated circuit and is housed in a 28-lead ssop for operation over the 0c to 70c temperature range. functional block diagram serial data interface 8 f s interpolator serial control interface auto-clock divide circuit volume mute control data input 3 2 digital supply clock in analog outputs 2 2 zero flag analog supply de-emphasis mute 2 serial mode 16-/18-/20-/24-bit digital data input ad1852 multibit sigma- delta modulator atten/ mute voltage reference dac 8 f s interpolator multibit sigma- delta modulator atten/ mute dac reset 0 8457-001 figure 1.
ad1852 rev. a | page 2 of 20 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? general description ......................................................................... 1 ? functional block diagram .............................................................. 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? analog performance .................................................................... 3 ? digital i/o (0c to 70c) ............................................................. 4 ? temperature range ...................................................................... 4 ? power .............................................................................................. 4 ? digital filter characteristics ....................................................... 4 ? group delay .................................................................................. 4 ? digital timing ............................................................................... 5 ? absolute maximum ratings ............................................................ 6 ? thermal resistance ...................................................................... 6 ? esd caution .................................................................................. 6 ? pin configuration and function descriptions ............................. 7 ? typical performance characteristics ..............................................9 ? theory of operation ...................................................................... 12 ? serial data input port ................................................................ 12 ? serial data input mode ............................................................. 12 ? master clock autodivide feature ............................................ 13 ? spi register definitions ............................................................ 13 ? register addresses ...................................................................... 14 ? volume left and volume right registers ............................... 14 ? spi timing................................................................................... 14 ? mute ............................................................................................. 14 ? control register ......................................................................... 15 ? de-emphasis ............................................................................... 15 ? output impedance ..................................................................... 15 ? reset ............................................................................................. 15 ? control signals ........................................................................... 15 ? outline dimensions ....................................................................... 18 ? ordering guide .......................................................................... 18 ? revision history 11/09rev. 0 to rev. a changes to format ............................................................. universal changes to note 1 ............................................................................. 1 changes to table 2 ............................................................................ 3 changes to table 11 .......................................................................... 7 changes to register addresses section and mute section ....... 14 changes to figure 29 ...................................................................... 16 1/00revision 0: initial version
ad1852 rev. a | page 3 of 20 specifications test conditions, unless otherwise noted. table 1. parameter rating supply voltages (avdd, dvdd) 5.0 v ambient temperature 25c input clock 24.576 mhz (512 f s mode) input signal 996.11 hz ?0.5 db full scale input sample rate 48 khz measurement bandwidth 20 hz to 20 khz word width 20 bits load capacitance 100 pf load impedance 47 k input voltage high 2.4 v input voltage low 0.8 v analog performance table 2. parameter 1 min typ max unit resolution 24 bits signal-to-noise ratio (20 hz to 20 khz) no filter (stereo) 112 db no filter (mono, see figure 19 ) 115 db with a-weighted filter (stereo) 114 db with a-weighted filter (mono) 117 db dynamic range (20 hz to 20 khz, ?60 db input) no filter (stereo) 107 112 db no filter (mono, see figure 24 ) 115 db with a-weighted filter (stereo) 110 114 db with a-weighted filter (mono) 117 db total harmonic distortion + noise (stereo) ?94 ?102 db 0.00079 % total harmonic distortion + noise (mono, see figure 20 ) ?105 db 0.00056 % total harmonic distortion + noise (stereo) v o = ?20 db ?92 db total harmonic distortion + noise (stereo) v o = ?60 db ?52 db analog outputs differential output range (full scale) 5.6 v p-p output capacitance at each output pin 2 pf out-of-band energy (0.5 f s to 100 khz) ?90 db cmout 2.37 v dc accuracy gain error ?10 2.0 +10 % interchannel gain mismatch ?0.15 0.015 +0.15 db gain drift 150 250 ppm/c dc offset ?50 mv interchannel crosstalk (eiaj method) ?120 db interchannel phase deviation 0.1 degrees mute attenuation ?100 db de-emphasis gain error 0.1 db 1 performance of right and left channels is identical (exclusive of the interchannel gain mismatch and interchannel phase deviat ion specifications).
ad1852 rev. a | page 4 of 20 digital i/o (0c to 70c) table 3. parameter min typ max unit input voltage high (v ih ) 2.2 v input voltage low (v il ) 0.8 v input leakage (i ih at v ih = 2.4 v) 10 a input leakage (i il at v il = 0.8 v) 10 a high level output voltage (v oh ), i oh = 1 ma 2.0 v low level output voltage (v ol ), i ol = 1 ma 0.4 v input capacitance 20 pf temperature range table 4. parameter min typ max unit specifications guaranteed 25 c functionality guaranteed 0 70 c storage ?55 +150 c power table 5. parameter min typ max unit supplies voltage, analog and digital 4.50 5 5.50 v analog current 33 40 ma analog current reset 32 46 ma digital current 20 30 ma digital current reset 27 37 ma dissipation operationboth supplies 265 mw operationanalog supply 165 mw operationdigital supply 100 mw power supply rejection ratio 1 khz, 300 mv p-p signal at analog supply pins ?60 db 20 khz, 300 mv p-p signal at analog supply pins ?50 db digital filter characteristics table 6. sample rate (khz) pass band (khz) stop band (khz) stop-band attenuation (db) pass-band ripple (db) 44.1 dc ? 20 24.1 ? 328.7 110 0.0002 48 dc ? 21.8 26.23 ? 358.28 110 0.0002 96 dc ? 39.95 56.9 ? 327.65 115 0.0005 192 dc ? 87.2 117 ? 327.65 95 +0/?0.04 (dc ? 21.8 khz) +0/?0.5 (dc ? 65.4 khz) +0/?1.5 (dc ? 87.2 khz) group delay table 7. chip mode group delay calculation f s (khz) group delay (s) int8 mode 5553/(128 f s ) 48 903.8 int4 mode 5601/(64 f s ) 96 911.6 int2 mode 5659/(32 f s ) 192 921
ad1852 rev. a | page 5 of 20 digital timing guaranteed over 0c to 70c, avdd = dvdd = 5.0 v 10%. table 8. parameter description min unit t dmp mclk period (f mclk = 256 f lrclk ) 1 54 ns t dml mclk low pulse width (all modes) 0.4 t dmp ns t dmh mclk high pulse width (all modes) 0.4 t dmp ns t dbh bclk high pulse width (see figure 26 ) 20 ns t dbl bclk low pulse width (see figure 26 ) 20 ns t dbp bclk period (see figure 26 ) 60 ns t dls lrclk setup (see figure 26 ) 20 ns t dlh lrclk hold (dsp serial port mode only) 5 ns t dds sdata setup (see figure 26 ) 5 ns t ddh sdata hold (see figure 26 ) 10 ns t rstl reset low pulse width 15 ns 1 higher mclk frequencies are allowable when using the on-chip master clock autodivide feature.
ad1852 rev. a | page 6 of 20 absolute maximum ratings table 9. parameter rating dvdd to dgnd ?0.3 v to +6 v avdd to agnd ?0.3 v to +6 v digital inputs dgnd ? 0.3 v to dvdd + 0.3 v analog outputs agnd ? 0.3 v to avdd + 0.3 v (see figure 26 ) agnd to dgnd ?0.3 v to +0.3 v reference voltage (avdd + 0.3 v)/2 v soldering 300c 10 sec stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. thermal resistance ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. table 10. package type ja jc unit thermal resistance junction-to-ambient 109 c/w junction-to-case 39 c/w esd caution
ad1852 rev. a | page 7 of 20 pin configuration and fu nction descriptions dgnd 1 mclk 2 c latch 3 cclk 4 dvdd 28 sdata 27 bclk 26 lrclk 25 cdata 5 nc 6 192/48 7 reset 24 mute 23 zerol 22 zeror 8 idpm0 21 deemp 9 idpm1 20 96/48 10 filtb 19 agnd 11 avdd 18 outr+ 12 outl+ 17 outr? 13 outl? 16 filter 14 agnd 15 top view (not to scale) ad1852 08457-002 figure 2. pin configuration table 11. pin function descriptions pin o. mnemonic input/utput description 1 dgnd i digital ground. 2 mclk i master clock input. connect to an extern al clock source running at either 256 f s , 384 f s , 512 f s , 768 f s , or 1024 f s . 3 clatch i latch input for spi control data port. this input is rising-edge sensitive. 4 cclk i spi control clock input for control data. control inp ut data must be valid on the rising edge of cclk. cclk may be continuous or gated. 5 cdata i spi control data input, msb first. spi data por t for controlling ad1852 functions as described in the spi register definitions section. 6 nc no connect. 7 192/ 48 i 192 khz/48 khz hardware sample rate selection. when it is asserted high, this pin selects 192 khz. when it is asserted low, this pin selects 48 khz. it is ord with bit 11 of the control register. 8 zeror o right channel zero flag output. this pin goes hi gh when the right channel has no signal input for more than 1024 lr clock cycles. 9 deemp i de-emphasis. digital de-emphasis is enabled when this input signal is high. this is used to impose a 50 s/15 s response characteristic on the output audio spectrum at an assumed 44.1 khz sample rate. curves for 32 khz and 48 khz sample rates may be selected via the spi control register. 10 96/ 48 i 96 khz/48 khz hardware sample rate selection. when it is asserted high, this pin selects 96 khz. when it is asserted low, this pin selects 48 khz. it is ord with bit 10 of the control register. 11, 15 agnd i analog ground. 12 outr+ o right channel positive line level analog output. 13 outr? o right channel negative line level analog output. 14 filtr o voltage reference filter capacitor connection. bypass and decouple the voltage reference with parallel 10 f and 0.1 f capacitors to the agnd. 16 outl? o left channel negative line level analog output. 17 outl+ o left channel positive line level analog output. 18 avdd i analog power supply. connec t this pin to the analog 5 v supply. 19 filtb filter capacitor connection. connect 10 f||10 nf capacitor to agnd (pin 15). 20 idpm1 i input serial data port mode control one. with idpm0, defines 1 of 4 serial modes. 21 idpm0 i input serial data port mode control zero. with idpm1, defines 1 of 4 serial modes. 22 zerol o left channel zero flag output. this pin goes high when the left channel has no signal input for more than 1024 lr clock cycles. 23 mute i mute. assert this pin high to mute both st ereo analog outputs. de-assert low for normal operation. 24 reset i reset. the ad1852 is reset on the rising edge of this signal. the serial control port registers are reset to the default values. for normal operation, assert this pin high.
ad1852 rev. a | page 8 of 20 pin no. mnemonic input/output description 25 lrclk i left/ right clock input for serial audio data input port. this pin must run continuously. 26 bclk i bit clock input for serial audio data input port . this pin need not run continuously; may be gated or used in a burst fashion. 27 sdata i serial audio data input, msb first. input for the serial audio data stream is as described the in serial data input port section. 28 dvdd i digital power supply. connect this pin to the digital 5 v supply. table 12. serial data input mode idpm1 (pin 20) idpm0 (pin 21) serial data input format 0 0 right justified 0 1 i 2 s compatible 1 0 left justified 1 1 dsp left channel right channel lsb msb?2 lsb+2 lsb+1 msb?1 msb?2 msb?1 msb lsb+2 lsb+1 lsb msb lsb bclk input s dat a input lrclk input 08457-003 figure 3. right-justified mode msb?2 msb?1 msb lsb+2 lsb+1 lsb left channel right channel bclk input s dat a input lrclk input msb lsb msb?2 lsb+2 lsb+1 msb?1 msb 08457-004 figure 4. i 2 s-justified mode left channel right channel bclk input s dat a input lrclk input msb?2 msb?1 msb lsb+2 lsb+1 lsb msb msb?1 lsb msb?2 lsb+2 lsb+1 msb?1 msb 08457-005 figure 5. left-justified mode left channel right channel bclk input s dat a input lrclk input msb?1 msb lsb+2 lsb+1 lsb msb msb?1 lsb lsb+2 lsb+1 msb?1 msb 08457-006 figure 6. left-justified dsp mode left channel right channel msb lsb msb?1 msb?2 lsb+2 lsb+1 msb?1 msb?2 msb lsb lsb+2 lsb+1 msb?1 lsb msb bclk input s dat a input lrclk input 0 8457-007 figure 7. 32 f s packed mode
ad1852 rev. a | page 9 of 20 typical performance characteristics figure 8 to figure 13 show the calculated frequency response of the digital interpolation filters. figure 14 to figure 25 show the performance of the ad1852 as measured by an audio precision system 2 cascade. for the wideband plots, the noise floor shown in the plots is hi gher than the actual noise floor of the ad1852. this is caused by the higher noise floor of the high bandwidth adc used in the audio precision measurement system. the two-tone test shown in figure 16 is per the smpte standard for measuring intermodulation distortion. 0.0010 0.0008 0.0006 0.0004 0.0002 0 ?0.0002 ?0.0004 ?0.0006 ?0.0008 ?0.0010 0246810121416182022 magnitude (db) frequency (khz) 08457-008 0 ?160 ?140 ?120 ?100 ?80 ?60 ?40 ?20 0 50 100 150 200 250 300 350 attenuation (db) frequency (khz) 08457-011 figure 8. pass-band response 8 mode, 48 khz sample rate figure 11. complete response, 8 mode, 48 khz sample rate 0.5 0.4 0.3 0.2 0.1 0 ?0.1 ?0.2 ?0.3 ?0.4 ?0.5 ?105 1015202530354045 magnitude (db) frequency (khz) 08457-009 0 ?160 ?140 ?120 ?100 ?80 ?60 ?40 ?20 0 50 100 150 200 250 300 attenuation (db) frequency (khz) 08457-012 figure 9. 44 khz pass-band response 4 mode, 96 khz sample rate figure 12. complete response, 4 mode, 96 khz sample rate 2.0 1.5 1.0 0.5 0 ?0.5 ?1.0 ?1.5 ?2.0 0 102030405060708090 magnitude (db) frequency (khz) 08457-010 0 ?160 ?140 ?120 ?100 ?80 ?60 ?40 ?20 0 50 100 150 200 250 attenuation (db) frequency (khz) 08457-013 figure 10. 88 khz pass-band response 2 mode, 192 khz sample rate figure 13. complete response, 2 mode, 192 khz sample rate
ad1852 rev. a | page 10 of 20 ? 50 ?120 ?110 ?100 ?90 ?80 ?70 ?60 10 100 1k 10k 20k magnitude (dbr) frequency (hz) 08457-014 figure 14. thd vs. frequency input @ ?3 dbfs, sr 48 khz 2 ?12 ?10 ?8 ?6 ?4 ?2 0 10 100 1k 10k 20k magnitude (dbr) frequency (hz) 08457-015 figure 15. normal de-emphasis frequency response input @ ?10 dbfs, sr 48 khz ? 10 ?150 ?130 ?110 ?90 ?70 ?50 ?30 0246810121416182022 magnitude (dbr) frequency (khz) 08457-016 figure 16. smpte/din 4:1 imd 60 hz/7 khz @ 0 dbfs 0 ?10 ?20 ?30 ?40 ?50 ?60 ?70 ?80 ?90 ?110 ?100 ?120 0 ?20 ?40 ?60 ?80 ?100 magnitude (db) frequency (khz) 08457-017 figure 17. thd + n ratio vs. amplitud e input 1 khz, sr 48 ks/s, 24-bit ? 90 ?160 ?150 ?140 ?130 ?120 ?110 ?100 0246810121416182022 magnitude (dbr) frequency (khz) 08457-018 figure 18. noise floor for zero input, sr 48 khz 0 ?10 ?20 ?30 ?40 ?50 ?60 ?70 ?80 ?90 ?100 ?110 ?120 ?130 ?140 ?150 0246810121416182022 magnitude (dbr) frequency (khz) 08457-019 figure 19. input 0 dbfs @ 1 khz, bw 10 hz to 22 khz, sr 48 khz
ad1852 rev. a | page 11 of 20 0 ?140 ?120 ?100 ?80 ?60 ?40 ?20 ?140 ?20 ?40 ?60 ?80 ?100 ?120 0 magnitude (dbr) (dbfs) 08457-020 ? 50 ?160 ?150 ?140 ?130 ?120 ?110 ?100 ?90 ?80 ?70 ?60 0246810121416182022 magnitude (dbr) frequency (khz) 08457-023 figure 20. linearity vs. amplitude inpu t 200 hz, sr 48 ks/s, 24-bit word figure 23. dynamic range for 1 khz @ ?60 dbfs, triangular dithered input ? 64 ?76 ?74 ?72 ?70 ?68 ?66 10 100 1k 10k 20k magnitude (dbr) frequency (hz) 08457-021 0 ?160 ?140 ?150 ?130 ?120 ?110 ?100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 08 7570656055504540353025201510 5 magnitude (dbr) frequency (khz) 0 08457-024 figure 21. power supply rejection vs. frequency, avdd 5 v dc + 100 mv p-p ac figure 24. wideband plot, 75 khz input, 2 interpolation, sr 192 khz 0 ?140 ?130 ?120 ?110 ?100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 01 100 80 60 40 20 magnitude (dbr) frequency (khz) 2 0 0 ?140 ?130 ?120 ?110 ?100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 01 100 80 60 40 20 magnitude (dbr) frequency (khz) 2 0 08457-025 08457-022 figure 22. wideband plot, 15 khz input, 8 interpolation, sr 48 khz figure 25. wideband plot, 37 khz input, 4 interpolation, sr 96 khz
ad1852 rev. a | page 12 of 20 theory of operation serial data input port the flexible, serial data input port of the ad1852 accepts data in twos-complement, msb-first format. the left channel data field always precedes the right channel data field. the serial mode is set by either using the external mode pins (idpm0, pin 21 and idpm1, pin 20) or the mode select bits (bit 4 and bit 5) in the spi control register. to control the serial mode using the external mode pins, the spi mode select bits should be set to zero (the default mode at power-up). to control the serial mode using the spi mode select bits, the external mode control pins should be grounded. in all modes, except for right-justified mode, the serial port accepts an arbitrary number of bits up to 24. extra bits do not cause an error, but they are truncated internally. in right- justified mode, use bit 8 and bit 9 of the spi control register to set the word length to 16 bits, 20 bits, or 24 bits. the default mode at power-up is 24-bit mode. when the spi control port is not being used, the spi pins (clatch, cclk, and cdata [pin 3, pin 4, and pin 5]) should be tied low. serial data input mode the ad1852 uses two multiplexed input pins to control the mode configuration of the input data port mode (see tabl e 12 ). figure 3 shows the right-justified mode (16 bits shown). lrclk is high for the left channel and low for the right channel. data is valid on the rising edge of bclk. in normal operation, there are 64-bit clocks per frame (or 32 per half frame). when the spi word length control bits (bit 8 and bit 9 in the spi control register) are set to 24 bits (0:0), the serial port begins to accept data starting at the eighth bit clock pulse after the lrclk transition. when the word length control bits are set to 20-bit mode, data is accepted starting at the 12 th bit clock position. in 16-bit mode, data is accepted starting at the 16 th bit clock position. these delays are independent of the number of bit clocks per frame, and therefore, other data formats are possible using the delay values previously described. for detailed timing, see figure 26 . figure 4 shows the i 2 s mode. lrclk is low for the left channel and high for the right channel. data is valid on the rising edge of bclk. the msb is left justified to an lrclk transition but with a single bclk period delay. the i 2 s mode can be used to accept any number of bits up to 24. figure 5 shows the left-justified mode. lrclk is high for the left channel, and low for the right channel. data is valid on the rising edge of bclk. the msb is left justified to an lrclk transition, with no msb delay. the left-justified mode can accept any word length up to 24 bits, and any number of bit clocks from two times the word length to 64-bit clocks per frame. figure 6 shows the dsp serial port mode. lrclk must pulse high for at least one bit clock period before the msb of the left channel is valid, and lrclk must pulse high again for at least one bit clock period before the msb of the right channel is valid. data is valid on the falling edge of bclk. the dsp serial port mode can be used with any word length up to 24 bits. in this mode, it is the responsibility of the dsp to ensure that the left data is transmitted with the first lrclk pulse and that synchronism is maintained from that point forward. note that the ad1852 is capable of a 32 f s bclk frequency packed mode, where the msb is left justified to an lrclk transition, and the lsb is right justified to the opposite lrclk transition. lrclk is high for the left channel and low for the right channel. data is valid on the rising edge of blck. packed mode can be used when the ad1852 is programmed in right- justified or left-justified mode. packed mode is shown is figure 7 .
ad1852 rev. a | page 13 of 20 bclk lrclk sdata left-justified mode sdata i 2 c-justified mode sdata right-justified mode lsb t dbh t dbp t dbl t dls t dds t ddh t dds t ddh t dds t ddh t dds t ddh msb msb ? 1 msb msb 8-bit clocks (24-bit data) 12-bit clocks (20-bit data) 16-bit clocks (16-bit data) 08457-026 figure 26. serial data port timing table 13. allowable mclk frequencies and internal delta clock rates chip mode allowable master clock frequencies nominal in put sample rate (khz) internal sigma-delta clock rate int 8 mode 256 f s , 384 f s , 512 f s , 768 f s , 1024 f s 48 128 f s int 4 mode 128 f s , 192 f s , 256 f s , 384 f s , 512 f s 96 64 f s int 2 mode 64 f s , 96 f s , 128 f s , 192 f s , 256 f s 192 32 f s d15 d14 d0 t chd t clh t cll t clsu t ccl t cch t csu cdata cclk clatch 0 8457-027 figure 27. serial control port timing master clock autodivide feature the ad1852 has a circuit that autodetects the relationship between the master clock and the incoming serial data and internally sets the correct divide ratio to run the interpolator and modulator. the allowable frequencies for each mode are shown in table 13 . master clock should be synchronized with lrclk however, phase relation between master clock and lrclk is not critical. spi register definitions the spi port allows flexible control of many chip parameters. it is organized around three registers: a left-channel volume register, a right-channel volume register, and a control register. each write operation to the ad1852 spi control port requires 16 bits of serial data in msb-first format. the bottom two bits are used to select one of three registers, and the top 14 bits are then written to that register. this allows a write to one of the three registers in a single 16-bit transaction. the spi cclk signal is used to clock in the data. the incoming data should change on the falling edge of this signal. at the end of the 16 cclk periods, the clatch signal should rise to clock the data internally into the ad1852. the serial control port timing is shown in figure 27 , and the spi digital timing values are listed in table 14 . table 14. spi digital timing parameter description value t cch cclk high pulse width 40 ns t ccl cclk low pulse width 40 ns t csu cdata setup time 10 ns t chd cdata hold time 10 ns t cll clatch low pulse width 10 ns t clh clatch high pulse width 10 ns t clsu clatch setup time 4 t mclk
ad1852 rev. a | page 14 of 20 register addresses the lowest two bits of the 16-bit serial control data word are decoded as the address of the register into which the upper 14 bits are written. these bits are defined in table 15 . table 15. ad1852 registers bit 1 bit 0 register 0 0 volume left 1 0 volume right 0 1 control register volume left and volume right registers a write operation to the left or right volume registers activates the autoramp, clickless volume control feature of the ad1852. the upper 10 bits of the volume control word increment or decrement by 1 at a rate equal to the input sample rate. the bottom four bits are not fed into the autoramp circuit and thus take effect immediately. this arrangement gives a worst-case ramp time of about 20 ms for step changes of more than 60 db, which was determined by listening tests to be optimal in terms of preventing the perception of a click sound on large volume changes. see figure 28 for a graphical description of how the volume changes as a function of time. the 14-bit volume control word is used to multiply the signal, and therefore, the control characteristic is linear, not db. a constant db/step characteristic can be obtained by using a lookup table in the microprocessor that is writing to the spi port. the volume word is unsigned (that is, 0 db is 11 1111 1111 1111). 20ms time ?60 ?60 0 0 level (db) volume request register actual volume register 08457-028 figure 28. smooth volume control spi timing the spi port is a 3-wire interface with serial data (cdata), serial bit clock (cclk), and data latch (clatch). the data is clocked into an internal shift register on the rising edge of cclk. the serial data should change on the falling edge of cclk and be stable on the rising edge of cclk. the rising edge of clatch is used internally to latch the parallel data from the serial-to-parallel converter. this rising edge should be aligned with the falling edge of the last cclk pulse in the 16-bit frame. the cclk can run continuously between transactions. note that the serial control port timing is asynchronous to the serial data port timing. changes made to the attenuator level update on the next edge of the lrclk after the clatch write pulse, as shown in figure 27 . mute the ad1852 offers two methods of muting the analog output. by asserting the mute (pin 23) signal high, both the left and right channel are muted. as an alternative, the user can assert the mute bit in the serial control register (bit 6) high. the ad1852 was designed to minimize pops and clicks when muting and unmuting the device by automatically ramping the gain up or down. when the device is unmuted, the volume returns to the value set in the volume register.
ad1852 rev. a | page 15 of 20 control register table 16 shows the functions of the control register. the control register is addressed by having a 01 in the bottom two bits of the 16-bit spi word. the top 14 bits are then used for the control register. de-emphasis the ad1852 has a built-in, de-emphasis filter that can be used to decode cds that have been encoded with the standard red book 50 s/15 s emphasis response curve. three curves are available; one each for the 32 khz, 44.1 khz, and 48 khz sampling rates. the external deemp pin (pin 9) turns on the 44.1 khz de-emphasis filter. the other filters may be selected by writing to control bit 2 and control bit 3 in the control register. if the spi port is used to control the de-emphasis filter, the external deemp pin should be tied low. output impedance the output impedance of the ad1852 is 65 30%. reset the ad1852 may be reset either by a dedicated hardware pin ( reset , pin 24) or by software via the spi control port. when reset is active, normal operation of the ad1852 is suspended, and the outputs assume midscale values. the ad1852 should always be reset at power up. the reset function should be active for a minimum of 64 master clock periods. when the reset function becomes inactive, normal operation continues after a delay equal to the group delay, plus three mclk periods. using the reset pin, the internal registers are set to their default values, when the reset pin is active low. when reset rises, the default operation is enabled. alternatively, the internal registers can be reset to their default values by setting bit 7 of the internal control register high. when bit 7 is reset low, default operation continues. the software reset differs from the hardware reset because the soft reset does not affect the values stored in the spi registers. control signals the idpm0 and idpm1 control inputs are normally connected high or low to establish the operating state of the ad1852, as described in table 12 . they can be changed dynamically (and asynchronously to lrclk and the master clock), but it is possible that a click or pop sound will result during the transition from one serial mode to another. if possible, the ad1852 should be placed in mute before such a change is made. table 16. control register functions bit number function bit 11 int 2 mode ord with pin 7 (192/ 48 ); default = 0 bit 10 int 4 mode ord with pin 10 (96/ 48 ); default = 0 bit 9:8 number of bits in right-justified serial mode 0:0 = 24 0:1 = 20 1:0 = 16 default = 0:0 bit 7 reset; default = 0 bit 6 soft mute ord with pin; default = 0 bit 5:4 serial mode ord with mode pins; idpm1:idpm0 0:0 = right-justified 0:1 = i 2 s 1:0 = left-justified 1:1 = dsp mode default = 0:0 bit 3:2 de-emphasis filter select 0:0 = no filter 0:1 = 44.1 khz filter 1:0 = 32 khz filter 1:1 = 48 khz filter default = 0:0
ad1852 rev. a | page 16 of 20 u1 ad1852jrs 96/48 192/48 nc sdata lrclk bclk mclk idpm0 idpm1 deemp mute clatch cclk cdata zeror zerol reset dgnd agnd outl+ outl? outr+ outr? filtb avdd dvdd c9 220pf np0 r9 1.96k ? r11 1.96k ? c10 220pf np0 r16 1.87k ? r10 1.96k ? r20 200 ? j11 left out c15 10nf np0 u3b ssm2135 r8 1.96k ? c14 1nf np0 r17 1.87k ? c13 1nf np0 c11 220pf np0 r13 1.96k ? r15 1.96k ? c12 220pf np0 r18 1.87k ? r14 1.96k ? r21 200 ? j21 right out c18 10nf np0 u3a ssm2135 r12 1.96k ? c17 1nf np0 r19 1.87k ? c16 1nf np0 c5 100nf +av cc ?av cc c6 100nf 3rd order lp bessel filter corner frequency: 75khz group delay: ~3.5s clatch cclk cdata zr zl reset u2a hc04 u2b hc04 agnd fb1 600z filtr c8 10f c1 100nf c7 10f cr1 zero left c4 100nf cr2 zero right r6 221? r7 221? 1 3 2 4 c3 100nf dvdd c2 100nf avdd mute deemp bclk mclk sdata lrclk r4 10k? r5 10k? dvdd i/f mode jp21 i/f mode idpm1 idpm0 rj, 16-bit 0 0 i 2 s01 rj, 20-bit 1 0 rj, 24-bit 1 1 dgnd jp11 mclk/sr sel r3 10k? r2 10k ? r1 10k? dvdd ad1852 stereo dac output buffers and lp filters zl zr mclk/sr select select rate 192/48 96/48 spdif 44.1khz to 48khz 0 0 direct 88.2khz to 96khz 0 1 direct 176.4khz to 192khz 1 0 08457-029 figure 29. dac, output buffers, and lp filters
ad1852 rev. a | page 17 of 20 ad1852 r2 3.01k ? r13 1.00k ? r3 3.01k ? r14 1.00k ? r1 3.01k ? r4 3.01k ? r6 3.01k ? c2 270pf r5 3.01k ? c2 270pf c7 1.5nf r17 549 ? c5 2.2nf r19 53.6k ? 1 0 ad797 ad1852 r8 3.01k ? r15 1.00k ? r9 3.01k ? r16 1.00k ? r7 3.01k ? r10 3.01k ? r12 3.01k ? c4 270pf r11 3.01k ? c3 270pf c9 1.5nf r18 549 ? c6 2.2nf r20 53.6k ? 1 0 ad797 sdata lrclk bclk sdata lrclk bclk l+ l? r+ r? l+ l? r+ r? 0 180 r r 0 180 l l mclk data separator output lrclk sdata lrclk lsdata rdata ln rn ln+1 rn+1 ln+2 rn+2 ln ln ln+1 ln+1 ln+2 rn rn rn+1 rn+1 rn+2 rn+2 ln+2 sdata lrclk bclk c10 1.5nf c8 1.5nf i 2 s left/right data separator and inverter i 2 s input to data separator 08457-030 figure 30. mono application circuit
ad1852 rev. a | page 18 of 20 outline dimensions compliant to jedec standards mo-150-ah 060106-a 28 15 14 1 10.50 10.20 9.90 8.20 7.80 7.40 5.60 5.30 5.00 seating plane 0.05 min 0.65 bsc 2.00 max 0.38 0.22 coplanarity 0.10 1.85 1.75 1.65 0.25 0.09 0.95 0.75 0.55 8 4 0 figure 31. 28-lead shrink small outline package [ssop] (rs-28) dimensions shown in millimeters ordering guide model temperature range package description package option ad1852jrsz 1 0c to 70c 28-lead shrink small outline package [ssop] rs-28 AD1852JRSZRL 1 0c to 70c 28-lead shrink small outline package [ssop], 13" tape and reel rs-28 eval-ad1852ebz 1 evaluation board 1 z = rohs compliant part.
ad1852 rev. a | page 19 of 20 notes
ad1852 rev. a | page 20 of 20 notes ?2000C2009 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d08457-0-11/09(a)

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