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features cs5334 dynamic range: 100 db thd+n: -90 db CS5335 dynamic range: 105 db thd+n: -95 db 128x oversampling fully differential inputs linear phase digital anti-alias filtering 21.7 khz passband (fs = 48khz) 85 db stop band attenuation 0.0025 db pass band ripple high pass filter - dc offset removal peak signal level detector high resolution and bar graph modes general description the cs5334 and CS5335 are 2-channel, single +5v supply, pin compatable analog-to-digital converters for digital audio systems. the cs5334 and CS5335 perform sampling, analog-to-digital conversion and anti-alias fil- tering, generating 20-bit values for both left and right inputs in serial form. the output word rate can be up to 50 khz per channel. the cs5334 and CS5335 use 4th-order, delta-sigma modulation with 128x oversampling followed by digital filtering and decimation, which removes the need for an external anti-alias filter. these adcs use a differential architecture which provides excellent noise rejection. the cs5334 and CS5335 have a filter passband to 21.7khz. the filter has linear phase, 0.0025 db pass- band ripple, and >85 db stopband rejection. an on-chip high pass filter is also included to remove dc offsets. ordering information: model temp. range package type cs5334-ks -10 to 70c 20-pin plastic ssop CS5335-ks -10 to 70c 20-pin plastic ssop crystal semiconductor corporation p.o. box 17847, austin, tx 78760 (512) 445 7222 fax: (512) 445 7581 http://www.crystal.com nov 96 ds237pp2 1 20-bit, stereo a/d converter for digital audio s/h s/h voltage reference comparator comparator va+ pu dac dac lp filter lp filter vd+ dgnd mclk digital decimation filter digital decimation filter serial output interface sdata ainr- agnd ainl- ainl+ ainr+ high pass filter high pass filter dif1 dif0 frame sclk lrck hp defeat cmout ovfl 11 7 2 8 12 9 20 19 1 5 6 4 13 14 17 16 15 3 10 rst 18 cs5334 CS5335 this document contains information for a new product. crystal semiconductor reserves the right to modify this product without notice. preliminary product information copyright ? crystal semiconductor corporation 1996 (all rights reserved)
specifications are subject to change without notice analog characteristics (t a = 25 c; va+ = vd+ = 5v; -1 dbfs input sinewave, 997 hz; fs = 48 khz; mclk = 12.288 mhz; sclk = 3.072 mhz; measurement bandwidth is 10 hz to 20 khz unless otherwise specified; logic 0 = 0v, logic 1 = vd+) cs5334 CS5335 parameter symbol min typ max min typ max units resolution 20 - - 20 - - bits dynamic performance dynamic range a-weighted tbd tbd 100 97 - - tbd tbd 105 102 - - db db total harmonic distortion + noise -1 db -20 db -60 db thd+n - - - -90 -77 -37 tbd tbd tbd - - - -95 -82 -42 tbd tbd tbd db db db interchannel phase deviation - 0.01 - - 0.01 - degree interchannel isolation (dc to 20 khz) - 100 - - 105 - db dc accuracy interchannel gain mismatch - 0.05 - - 0.05 - db gain error - - 5 -- 5 % gain drift - 200 - - 200 - ppm/c offset error with hpf hp defeat with cal - - 0 +/- 100 - - - - 0 +/- 100 - - lsb lsb analog input input voltage range (differential) vin 1.9 2.0 2.1 1.9 2.0 2.1 vrms input impedance zin - 30 - - 30 - k w input bias voltage - 2.2 - - 2.2 - v power supplies power supply current i a i d power down (i a +i d ) - - - 38 25 0.2 tbd tbd - - - - 40 25 0.2 tbd tbd - ma ma ma power dissipation normal power down - - 315 1.0 tbd - - - 325 1.0 tbd - mw mw power supply rejection ratio - 50 - - 55 - db cs5334 CS5335 2 ds237pp2
digital filter characteristics (t a = 25 c; va+ = vd+ = 5v 5%; fs = 48 khz) parameter symbol min typ max units passband (note 1) 0.02 - 21.7 khz passband ripple - - 0.0025 db stopband (note 1) 26.3 - 6118 khz stopband attenuation (note 2) 85 - - db group delay (fs = output sample rate) t gd - 32/fs - s group delay variation vs. frequency d t gd --0 m s high pass filter characteristics frequency response: -3 db (note 1) -0.01 db - - 0.9 20 - - hz hz phase deviation @ 20 hz (note 1) - 2.6 - degree passband ripple - - 0 db notes: 1. filter characteristic scales with output sample rate. 2. the analog modulator samples the input at 6.144 mhz for an output sample rate of 48 khz. there is no rejection of input signals which are multiples of the sampling frequency ( n x 6.144 mhz 21.7khz where n = 0,1,2,3...). digital characteristics (t a = 25 c; va+ = vd+ = 5v 5%) parameter symbol min typ max units high-level input voltage v ih 2.4 - - v low-level input voltage v il --0.8v high-level output voltage at lo = -20 m a v oh (vd+)-1.0 - - v low-level output voltage at lo = 20 m a v ol --0.4v input leakage current i in --10 m a absolute maximum ratings (agnd = 0v, all voltages with respect to ground.) parameter symbol min typ max units dc power supply: va+ -0.3 - +6.0 v input current, any pin except supplies (note 3) iin - - 10 ma analog input voltage (note 4) v ina -0.7 - (va+)+0.7 v digital input voltage (note 4) v ind -0.7 - (va+)+0.7 v ambient temperature (power applied) t a -55 - +125 c storage temperature t stg -65 - +150 c notes: 3. any pin except supplies. transient currents of up to +/- 100 ma on the analog input pins will not cause scr latch-up. 4. the maximum over/under voltage is limited by the input current. warning:operation at or beyond these limits may result in permanent damage to the device. normal operation is not guaranteed at these extremes. cs5334 CS5335 ds237pp2 3
switching characteristics (t a = 25 c; va+ = 5v 5%; inputs: logic 0 = 0v, logic 1 = va+ = vd+; c l = 20 pf) parameter symbol min typ max units output sample rate f s 2.0 - 50 khz mclk period mclk / lrck = 256 t clkw 78 - 1953 ns mclk low mclk / lrck = 256 t clkl 31 - - ns mclk high mclk / lrck = 256 t clkh 31 - - ns mclk period mclk / lrck = 384 t clkw 52 - 1302 ns mclk low mclk / lrck = 384 t clkl 20 - - ns mclk high mclk / lrck = 384 t clkh 20 - - ns mclk period mclk / lrck = 512 t clkw 39 - 976 ns mclk low mclk / lrck = 512 t clkl 15 - - ns mclk high mclk / lrck = 512 t clkh 15 - - ns master mode sclk falling to lrck (note 5) t mslr -10 - 10 ns sclk falling to sdata valid (note 5) t sdo -10 - 35 ns sclk duty cycle - 50 - % sclk falling to frame valid (note 5) t sfo -10 - (note 6) ns lrck edge to ovfl valid t ovfl -10 - 30 ns lrck edge to ovfl edge delay t ovfl -10 - (note 10) ns slave mode lrck duty cycle 25 50 75 % sclk period t sclkw (note 7) - - ns sclk pulse width low (note 8) t sclkl (note 11) - - ns sclk pulse width high (note 9) t sclkh 50 - - ns sclk falling to sdata valid (note 5) t dss - - (note 11) ns lrck edge to msb valid t lrdss - - (note 11) ns sclk rising to lrck edge delay (note 12) t slr1 50 - - ns lrck edge to rising sclk setup time (note 12) t slr2 (note 11) - - ns sclk falling to frame delay t sfo - - (note 13) ns notes: 5. sclk rising for mode 1. 6. 1 ( 1024 )( f s ) + 30ns 7. 1 ( 96 )( f s ) 8. pulse width high for mode 1 9. pulse width low for mode 1 10. 1 ( 512 )( f s ) + 20ns 11. 1 ( 512 )( f s ) + 50ns 12. sclk falling for mode 1 13. 1 ( 384 )( f s ) + 35ns cs5334 CS5335 4 ds237pp2
sdata sclk input (slave mode) (slave mode) lrck input sclkh t dss t msb msb-1 sclkl t slr1 t slr2 t t sclkw ovfl t ovfl sclk to lrck & sdata - slave mode format 2 sclk output t mslr sdata t sdo lrck output msb t ovfl ovfl sclk to sdata & lrck - master mode format 2 sclk output* t mslr sdata t sdo lrck output t ovfl ovfl msb msb-1 sclk to sdata & lrck - master mode format 0 and 1 sdata sclk input* (slave mode) (slave mode) lrck input sclkh t dss t msb msb-1 msb-2 lrdss t sclkl t slr1 t slr2 t t sclkw ovfl ovfl t sclk to lrck & sdata - slave mode format 0 & 1 sclk* frame t sfo sclk to frame delay *sclk is inverted for format 1 cs5334 CS5335 ds237pp2 5
+ 1 m f 0.1 m f 2 w + 1 m f 0.1 m f +5v analog vd+ va+ 63 2.2 nf 150 w 150 w left analog input + left analog input - 17 16 2.2 nf 150 w 150 w right analog input + right analog input - 13 14 15 ainl+ ainl- cmout ainr+ ainr- 2 11 peak signal level monitor 1 20 mode settings 19 18 9 audio data processing 12 8 timing, logic & clock 10 7 ovfl pu hp defeat dif0 dif1 rst lrck sclk frame mclk sdata dgnd agnd 54 cs5334 CS5335 a/d converter 47 k w * 47 k w ** required for master mode only required for bar graph mode only * ** 100 w 100 w 100 w 100 w figure 1. typical connection diagram cs5334 CS5335 6 ds237pp2
system design the cs5334 and CS5335 are 20-bit, 2-channel analog-to-digital converters designed for digital audio applications. these devices use two one- bit delta-sigma modulators which simultaneously sample the analog input signals at 128 times the output sample rate (fs). the resulting serial bit streams are digitally filtered, yielding a pair of 20-bit values. this technique yields nearly ideal conversion performance independent of input frequency and amplitude. the converter does not require difficult-to-design or expensive anti-alias filters and does not require external sample-and- hold amplifiers or a voltage reference. very few external components are required to support these adcs. normal power supply decoupling components and a resistor and capacitor on each input for anti-aliasing are all thats required, as shown in figure 1. an on-chip voltage reference provides for a dif- ferential input signal range of 2.0 vrms. output data is available in serial form, coded as 2s complement, 20-bit numbers. typical power consumption is 325 mw which can be reduced to 1.0 mw using the power-down feature. master clock the master clock (mclk) is the clock source for the delta-sigma modulator sampling and digi- tal filters. in master mode, the frequency of this clock must be 256 fs. in slave mode, the mas- ter clock must be either 256 , 384 or 512 fs. table 1 shows some common master clock fre- quencies. serial data interface the cs5334 and CS5335 support three serial data formats, including i 2 s, which are selected via the digital input format pins dif0 and dif1. the digital input format determines the relation- ship between the serial data, left/right clock and serial clock. table 2 lists the three formats, along with the associated figure number. the serial data interface is accomplished via the serial data output, sdata, serial data clock, sclk, and the left/right clock, lrck. serial data the serial data block consists of 20 bits of audio data presented in 2s-complement format with the msb-first, followed by 4 bits of zero and 8 peak signal level, psl, bits as shown in fig- ure 2. the data is clocked from sdata by the serial clock and the channel is determined by the left/right clock. lrck (khz) mclk (mhz) 256 x 384 x 512 x 32 8.1920 12.2880 16.3840 44.1 11.2896 16.9344 22.5792 48 12.2880 18.4320 24.5760 table 1. common clock frequencies sdata frame p7 19 18 1 0 p6 p1 p0 20 audio data bits 4 zeros 8 psl bits figure 2. data block and frame dif1 dif0 format figure 0003 0114 1025 1 1 power-down - table 2. digital input formats cs5334 CS5335 ds237pp2 7
sdata p1 p0 19 18 1 p7 p6 p5 p4 p3 p2 0 19 18 frame sclk lrck p1 p0 19 18 1 p7 p6 p5 p4 p3 p2 0 master slave 20-bit left justified data 20-bit left justified data data valid on rising edge of 64x sclk data valid on rising edge of sclk mclk equal to 256x f s mclk equal to 256x, 384x or 512x f s figure 3. serial data format 0 sdata p1 p0 19 18 1 p7 p6 p5 p4 p3 p2 0 19 18 frame sclk lrck p1 p0 19 18 1 p7 p6 p5 p4 p3 p2 0 master slave 20-bit left justified data 20-bit left justified data data valid on falling edge of 64x sclk data valid on falling edge of sclk mclk equal to 256x f s mclk equal to 256x, 384x or 512x f s figure 4. serial data format 1 sdata p1 p0 19 18 1 p7 p6 p5 p4 p3 p2 0 19 18 frame sclk lrck p1 p0 19 18 1 p7 p6 p5 p4 p3 p2 0 master slave i 2 s 20-bit data i 2 s 20-bit data data valid on rising edge of 64x sclk data valid on rising edge of sclk mclk equal to 256x f s mclk equal to 256x, 384x or 512x f s figure 5. serial data format 2 cs5334 CS5335 8 ds237pp2
serial clock the serial clock shifts the digitized audio data from the internal data registers via the sdata pin. sclk is an output in master mode. internal dividers will divide the master clock by 4 to generate a serial clock which is 64 fs. in slave mode, sclk is an input with a serial clock typically between 4 8 and 128 fs. how- ever, the serial clock must be a minimum of 64 fs to access the peak signal level bits. left / right clock the left/right clock determines which channel, left or right, is to be output on sdata. although the outputs for each channel are transmitted at different times, left/right pairs represent simul- taneously sampled analog inputs. in master mode, lrck is an output whose frequency is equal to fs. in slave mode, lrck is an input whose frequency must be equal to the output sample rate, fs. master mode in master mode, sclk and lrck are outputs which are internally derived from the master clock. internal dividers will divide mclk by 4 to generate a sclk which is 64 fs and by 256 to generate a lrck which is equal to fs. master mode is only supported with a 256 master clock. the cs5334/5 is placed in the master mode with a 47 k w pull-down resistor on the ovfl pin. slave mode lrck and sclk become inputs in slave mode. lrck must be externally derived from mclk and be equal to fs. the serial clock is typically between 64 and 128 fs. a 48 fs serial clock is possible though will not allow ac- cess to the peak signal level bits. master clock frequencies of 256 , 384 and 512 fs are sup- ported. the ratio of the applied master clock to the left/right clock is automatically detected dur- ing power-up and internal dividers are set to gen- erate the appropriate internal clocks. analog connections figure 1 shows the analog input connections. the analog inputs are presented to the modula- tors via the ainr+/- and ainl+/- pins. each analog input pin will accept a maximum of 1 vrms centered at +2.2 volt as shown in fig- ure 6. input signals can be ac or dc coupled and the cmout output may be used as a refer- ence for dc coupling. however, cmout is not buffered and the maximum current is 10 m a. the cs5334 and CS5335 sample the analog in- puts at 128 fs, 6.144 mhz for a 48 khz sample-rate. the digital filter rejects all noise above 26.3 khz except for frequencies right around 6.144 mhz 21.7 khz (and multiples of 6.144 mhz). most audio signals do not have sig- nificant energy at 6.144 mhz. nevertheless, a 150 w resistor in series with each analog input and a 2.2 nf capacitor across the inputs will at- tenuate any noise energy at 6.144 mhz, in addition to providing the optimum source imped- ance for the modulators. the use of capacitors which have a large voltage coefficient must be avoided since these will degrade signal linearity. npo and cog capacitors are acceptable. if ac- tive circuitry precedes the adc, it is recommended that the above rc filter is placed between the active circuitry and the ainr and ainl pins. the above example frequencies scale linearly with sample rate. 3.6 v 2.2 v 0.78 v 3.6 v 2.2 v 0.78 v cs5334 CS5335 ain+ ain- full scale input level= (ain+) - (ain-)= 5.67 vpp figure 6. full scale input levels cs5334 CS5335 ds237pp2 9
high pass filter the operational amplifiers in the input circuitry driving the cs5334/5 may generate a small dc offset into the a/d converter. the cs5334 and CS5335 include a high pass filter after the deci- mator 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 can be disabled with the hp defeat pin. the high pass filter works by continuously subtracting a measure of the dc offset from the output of the decimation filter. if the hp defeat pin is taken high during normal operation, the current value of the dc offset register is frozen and this dc offset will continue to be subtracted from the conversion result. this feature makes it possible to perform a system calibration by; 1. removing the signal source (or grounding the input signal) at the input to the subsystem con- taining the cs5334/5, 2. running the cs5334/5 with the hp defeat pin low (high pass filter enabled) until the filter settles (approximately 1 second), and 3. taking the hp defeat pin high, disabling the high pass filter and freezing the stored dc offset. a system calibration performed in this way will eliminate offsets anywhere in the signal path be- tween the calibration point and the cs5334/5. the characteristics of the first-order high pass filter are outlined below for an output sample rate of 48 khz. this filter response scales line- arly with sample rate. frequency response: -3 db @ 0.9 hz -0.01 db @ 20 hz phase deviation: 2.6 degrees @ 20 hz passband ripple: none input level monitoring the cs5334 and CS5335 include independent peak input level monitoring for each channel. the analog-to-digital converter continually moni- tors the peak digital signal for both channels, prior to the digital limiter, and records these val- ues in the active registers. this information can be transferred to the output registers by a high to low transition on the peak update pin (pu) which will also reset the active register. the ac- tive register contains the peak signal level since the previous peak update request. the 8-bit contents of the output registers are available in all interface modes and are present in the data block as shown in figure 2. the monitoring function can be formatted to indicate either high resolution mode or bar graph mode. the monitoring function is determined on power-up by the presence of a 47 kohm pull- down resistor on frame. the addition of a 47 kohm pull-down resistor on the frame pin sets the monitoring function to the bar graph mode. high resolution mode bits p7-p0 indicate the peak input level since the previous peak update (or low transition on the peak update pin). if the full scale input level is exceeded (bit p7 high), bits p5-p0 represent the peak value up to 3 db above full-scale in 1 db steps. if the adc input level is less than full- scale, bits p5-p0 represent the peak value from -60 db to 0 db of full scale in 1 db steps. the psl outputs are accurate to within 0.25 db. bit p6 provides a coarse means of determining an adc input idle condition. bit p7 indicates an adc overflow condition, if the adc input level is greater than full-scale. cs5334 CS5335 10 ds237pp2
p7 - overrange 0 - analog input less than full-scale level 1 - analog input greater than full-scale p6 - idle channel 0 - analog input >-60 db from full-scale 1 - analog input <-60 db from full-scale p5 to p0 - peak signal level bits (1 db steps) inputs <0 db p5 - p0 0 db 000000 -1 db 000001 -2 db 000010 -60 db 111100 inputs >0 db p5 - p0 0 db 000000 +1 db 000001 +2 db 000010 +3 db 000011 bar graph mode this mode provides a decoded output format which indicates the peak peak signal level in a "bar graph" format. input level p7 - p0 overflow 11111111 0 db to -3 db 01111111 -3 db to -6 db 00111111 -6 db to -10 db 00011111 -10 db to -20 db 00001111 -20 db to -30 db 00000111 -30 db to -40 db 00000011 -40 db to -60 db 00000001 < - 60 db 00000000 overflow overflow indicates analog input overrange, for both the left and right channels, since the last update request on the peak update pin. a value of 1 indicates an overrange condition. the left channel information is output on ovfl during the left channel portion of lrck. the right channel information is available on ovfl during the right channel portion of lrck. initialization upon initial power-up, the digital filters and delta-sigma modulators are reset and the internal voltage reference is powered down. the cs5334/5 will remain in the power-down mode until valid clocks are presented. a valid mclk is required to exit power-down in master mode. however, in slave mode, mclk and lrck of the proper ratio are required to exit power-down. mclk occurrences are also counted over one lrck period to determine the mclk / lrck frequency ratio in slave mode. power is then ap- plied to the internal voltage reference, the analog inputs will move to approximately 2.2v and out- put clocks will begin (master mode only). this process requires 32 periods of lrck and is fol- lowed by the initialization sequence. initialization with high pass filter enabled 28,672 lrck cycles are required for the initiali- zation sequence with the high pass filter enabled. this time is dominated by the settling time re- quired for the high pass filter. initialization and internal calibration with high pass filter disabled if the hp defeat pin is high (high pass filter disabled) during the initialization sequence, the cs5334/5 will perform an internal dc calibration by: 1. disconnecting the internal adc inputs from the input pins, 2. connecting the (differential) adc inputs to a common reference voltage, cs5334 CS5335 ds237pp2 11
3. running the high pass filter with a fast settling time constant, 4. freezing the dc offset register, and 5. reconnecting the internal adc inputs to the input pins. this procedure takes 4,160 cycles of lrck. unlike the system calibration procedure de- scribed in the high pass filter section, a dc calibration performed during start-up will only eliminate offsets internal to the cs5334/5, and should result in output codes which accurately reflect the differential dc signal at the pins. power-down the cs5334 and CS5335 have a power-down mode wherein typical consumption drops to 1.0 mw. this is initiated when a loss of clock is de- tected (either lrck or mclk in slave mode or mclk in master mode), rst is enabled or dif0 / dif1 are at a logic 1. the initialization sequence will begin whenever valid clocks are restored, rst is disabled and dif0 / dif1 are restored. if the mclk / lrck frequency ratio changes during power-down, the cs5334/5 will adapt to these new operating conditions. how- ever, only the rst method of power-down will include the master/slave decision in the initiali- zation sequence. grounding and power supply decoupling as with any high resolution converter, the cs5334 and CS5335 require careful attention to power supply and grounding arrangements to op- timize performance. figure 1 shows the recommended power arrangements with va+ connected to a clean +5 volt supply. vd+ should be derived from va+ through a 2 ohm resistor. vd+ should not be used to power additional digital circuitry. all mode pins which require vd+ should be connected to pin 6 of the cs5334/5. all mode pins which require dgnd should be connected to pin 5 of the cs5334/5. agnd and dgnd, pins 4 and 5, should be con- nected together at the cs5334/5. dgnd for the cs5334/5 should not be confused with the ground for the digital section of the system. the cs5334/5 should be positioned over the analog ground plane near the digital / analog ground plane split. the analog and digital ground planes must be connected elsewhere in the system. the cs5334/5 evaluation board, cdb5334/5, demon- strates this layout technique. this technique minimizes digital noise and insures proper power supply matching and sequencing. decoupling ca- pacitors should be located as near to the cs5334/5 as possible. cs5334 CS5335 12 ds237pp2
digital filter figures 7-10 show the performance of the digital filter included in the cs5334/5. all plots are normalized to fs. assuming a sample rate of 48 khz, the 0.5 frequency point on the plot refers to 24 khz. the filter frequency re- sponse scales precisely with the sample rate. figure 7. cs5334/5 digital filter stopband rejection figure 9. cs5334/5 digital filter passband ripple figure 8. cs5334/5 digital filter transition band figure 10.cs5334/5 digital filter transition band cs5334 CS5335 ds237pp2 13
pin descriptions power supply connections va+ - positive analog power, pin 3. positive analog supply. nominally +5 volts. vd+ - positive digital power, pin 6. positive digital supply. nominally +5 volts. agnd - analog ground, pin 4. analog ground reference. dgnd - digital ground, pin 5. digital ground reference. analog inputs ainr-, ainr+ - differential right channel analog input, pin 14 and pin 13. analog input connections of the right channel differential inputs. typically 2 vrms differential (1vrms for each input pin) for a full-scale analog input signal. ainl-, ainl+ - differential left channel analog input, pin 16 and pin 17. analog input connections of the left channel differential inputs. typically 2 vrms differential (1vrms for each input pin) for a full-scale analog input signal. analog outputs cmout - common mode output, pin 15. this output, nominally 2.2v, can be used to bias the analog input circuitry to the common mode voltage of the cs5334/5. 1 2 3 4 5 6 7 8 9 20 19 18 17 16 15 14 13 12 10 11 high pass filter defeat hp defeat dif0 digital interface format 0 overflow ovfl dif1 digital interface format 1 analog power va+ rst reset analog ground agnd ainl+ non-inverting left channel input digital ground dgnd ainl- inverting left channel input digital power vd+ cmout common mode output master clock mclk ainr- inverting right channel input serial data clock sclk ainr+ non-inverting right channel input serial data output sdata lrck left/ right clock frame signal frame pu peak update cs5334 CS5335 14 ds237pp2
digital inputs mclk - master clock, pin 7. clock source for the delta-sigma modulator sampling and digital filters. in master mode, the frequency of this clock must be 256 the output sample rate, fs. in slave mode, the frequency of this clock must be either 256 , 384 or 512 fs. dif0, dif1 - digital interface format, pins 19 and 20. these two pins select one of 3 digital interface formats or power-down. the format determines the relationship between sclk, lrck and sdata. the formats are detailed in figures 3-5. rst - reset, pin 18. a low logic level on this pin activates reset. hp defeat - high pass filter defeat, pin 1. a high logic level on this pin disables the digital high pass filter. a low logic level on this pin enables the high pass filter. pu - peak update, pin 11. transfers the peak signal level contents of the active registers to the output registers on a high to low transition on this pin. this transition will also reset the active register. digital inputs / outputs lrck - left/right clock, pin 12. lrck determines which channel, left or right, is to be output on sdata. the relationship between lrck, sclk and sdata is controlled by dif0 and dif1. although the outputs for each channel are transmitted at different times, left/right pairs represent simultaneously sampled analog inputs. in master mode, lrck is an output clock whose frequency is equal to the output sample rate, fs. in slave mode, lrck is an input clock whose frequency must be equal to fs. sclk - serial data clock, pin 8. clocks the individual bits of the serial data out from the sdata pin. the relationship between lrck, sclk and sdata is controlled by dif0 and dif1. in master mode, sclk is an output clock with a frequency of 64x the output sample rate, fs. in slave mode, sclk is an input. digital outputs sdata - serial data output, pin 9. two?s complement msb-first serial data of 20 bits is output on this pin. included in the serial data output is the 8-bit input signal level bits. the data is clocked out via the sclk clock and the channel is determined by lrck. the relationship between lrck, sclk and sdata is controlled by dif0 and dif1. cs5334 CS5335 ds237pp2 15
ovfl - overflow, pin 2. overflow indicates analog input overrange, for both the left and right channels, since the last update request on the peak update (pu) pin. a value of 1 in the register indicates an overrange condition. the left channel information is output on ovfl during the left channel portion of lrck. the right channel information is available on ovfl during the right channel portion of lrck. the registers are updated with a high to low transition on the peak update pin. a 47 kohm pull-down resistor on this pin will set the cs5334/5 in master mode. frame - frame signal, pin 10. frames the peak signal level (psl) bits. frame goes high coincident with the leading edge of the first psl bit and falls coincident with the trailing edge of the last psl bit as shown in figures 3-5. a 47 kohm pull-down resistor on this pin will set the peak signal level monitoring format to "bar graph" mode. parameter definitions dynamic range 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 band width made with a -60dbfs signal. 60db 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 effect 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 (thd+n) the ratio of the rms value of the signal to the rms sum of all other spectral components over the specified band width (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 at 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 input for a full-scale digital output. cs5334 CS5335 16 ds237pp2
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. cs5334 CS5335 ds237pp2 17
package dimensions e eb a a1 d e1 a2 see detail 'a' q l 0.25 bsc seating plane gauge plane 3 3 detail 'a' side view end view top view 4 seating plane notes: 1. dimensioning and tolerance per ansi.y14.5m-1982. 2. symbols are defined in the "mo series symbol list" in section 2.2 of jedec publication 95. 3. "d" and "e1" are reference datums and do not include mold flash or protrusions, but do include mold mismatch and are measured at the parting line, mold flash or protrusions shall not exceed 0.20mm per side. 4. dimension b does not include dambar protrusion/intrusion. allowable dambar protrusion shall be 0.13mm total in excess of b dimension at maximum material condition. dambar intrusion shall not reduce dimension b by more than 0.07mm at least material condition. 5. these dimensions apply to the flat section of the lead between 0.10 and 0.25mm from lead tips. n 1 32 ssop package dimensions n d min nom max 14 16 20 24 28 30 5.90 6.20 6.50 5.90 6.20 6.50 6.90 7.20 7.50 7.90 8.20 8.50 9.90 10.20 10.50 9.90 10.20 10.50 note 3 3 3 3 3 3 8 2.70 3.00 3.30 3 18 6.90 7.20 7.50 3 22 7.90 8.20 8.50 3 dim millimeters min nom max a a1 a2 b d e1 e e l n q - - 2.13 0.05 - 0.25 1.62 1.75 1.88 0.22 - 0.38 see other table 5.00 5.30 5.60 0.65 bsc 7.40 7.80 8.20 0.63 0.90 1.03 see other table 0 4 8 note 4, 5 3 3 cs5334 CS5335 18 ds237pp2
? notes ?

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