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[AK4392] ms1045-e-02 2009/04 - 1 - general description AK4392 is a 32-bit dac, which corres ponds to dvd-audio systems. an internal circuit includes newly developed 32bit digital filter for better sound quality achieving low distortion characteristics and wide dynamic range. the AK4392 has full differential scf outputs, removing the need for ac coupling capacitors and increasing performance for systems with excessive clock jitter. the AK4392 accepts 192khz pcm data and 1-bit dsd data, ideal for a wide range of ap plications including blu-ray, dvd-audio and sacd. features ? 128x over sampling ? sampling rate: 30khz 216khz ? 32bit 8x digital filter (min imum delay option gd=7/fs) - ripple: 0.005db, attenuation: 100db ? high tolerance to clock jitter ? low distortion differential output ? dsd data input ? digital de-emphasis fo r 32, 44.1, 48khz sampling ? soft mute ? digital attenuator (255 levels and 0.5db step) ? mono mode ? external digital filter mode ? thd+n: -103db ? dr, s/n: 120db ? i/f format: 24/32bit msb justified, 16/20/24/32bit lsb justified, i 2 s, dsd ? master clock: 30khz ~ 32khz: 1152fs 30khz ~ 54khz: 512fs or 768fs 30khz ~ 108khz: 256fs or 384fs 108khz ~ 216khz: 128fs or 192fs ? power supply: 4.75 5.25v ? digital input level: ttl ? package: 44pin lqfp AK4392 high performance 120db premium 32-bit dac
[AK4392] ms1045-e-02 2009/04 - 2 - block diagram mcl k sdata/dsdl lrck/dsdr/wc k csn/smute bick/dclk cclk/dem0 cdti/dem1 dzfr vss1 vddr pdn avdd scf scf clock divider vss3 dvdd dinr dinl bck cad0 cad1/dif0 psn dzfl/dif1 dif2 vss2 vddl vcml aoutrn vcmr vrefhl vrefll vreflr vrefll vss4 aoutlp aoutln aoutrp pcm data interface dsd data interface external df interface 8x interpolator control register datt soft mute '6 modulator bias vref block diagram
[AK4392] ms1045-e-02 2009/04 - 3 - ordering guide AK4392eq 10 a +70 q c 44pin lqfp (0.8mm pitch) akd4392 evaluation board for AK4392 pin layout aoutlp aoutl n 34 vcml 33 35 nc 36 nc 37 nc 38 nc 39 vss3 40 avdd 41 mclk 42 vss4 43 nc 44 vss2 32 vdd l 31 vrefhl 30 vrefll 2 9 nc 28 vreflr 27 vrefh r 26 vddr 2 5 vss1 24 aoutrn 23 dvd d 1 pd n 2 bick/dcl k 3 sdata/dsdl 4 lrck/dsdr/wc k 5 sm ute/csn 6 tst1/cad0 7 dem0/ccl k 8 dem1/cdt i 9 dif0/cad1 10 dif1/dzf l 11 22 21 20 19 18 17 16 15 14 13 12 a outrp vcmr nc dinl dinr nc bck tst2/dzfr psn nc dif2 AK4392 top vi ew
[AK4392] ms1045-e-02 2009/04 - 4 - pin/function no. pin name i/o function 1 dvdd - digital power supply pin, 4.75 5.25v 2 pdn i power-down mode pin when at ?l?, the AK4392 is in power-down mode and is held in reset. the AK4392 should always be reset upon power-up. bick i audio serial data clock pin in pcm mode 3 dclk i dsd clock pin in dsd mode sdata i audio serial data input pin in pcm mode 4 dsdl i dsd lch data input pin in dsd mode lrck i l/r clock pin in pcm mode dsdr i dsd rch data input pin in dsd mode 5 wck i word clock input pin smute i soft mute pin in parallel control mode when this pin is changed to ?h?, soft mute cycle is initiated. when returning ?l?, the output mute releases. 6 csn i chip select pin in serial control mode tst1 i test pin in parallel control mode (internal pull-down pin) 7 cad0 i chip address 0 pin in serial control mode (internal pull-down pin) dem0 i de-emphasis enable 0 pin in parallel control mode 8 cclk i control data clock pin in serial control mode dem1 i de-emphasis enable 1 pin in parallel control mode 9 cdti i control data input pin in serial control mode dif0 i digital input format 0 pin in pcm mode 10 cad1 i chip address 1 pin in serial control mode dif1 i digital input format 1 pin in pcm mode 11 dzfl o lch zero input detect pin in serial control mode 12 dif2 i digital input format 2 pin in pcm mode 13 nc - no internal bonding. connect to gnd. note: all input pins except internal pull-up/down pins must not be left floating.
[AK4392] ms1045-e-02 2009/04 - 5 - 14 psn i parallel or serial select pin (internal pull-up pin) ?l?: serial control mode, ?h?: parallel control mode tst2 i test pin in parallel control mode. connect to gnd. 15 dzfr o rch zero input detect pin in serial control mode 16 bck i audio serial data clock pin (internal pull-down pin) 17 nc - no internal bonding. connect to gnd. 18 dinr i rch audio serial data input pin (internal pull-down pin) 19 dinl i lch audio serial data input pin (internal pull-down pin) 20 nc - no internal bonding. connect to gnd. 21 vcmr - right channel common voltage pin, normally connected to vs s with a 10uf electrolytic cap. 22 aoutrp o rch positive analog output pin 23 aoutrn o rch negative analog output pin 24 vss1 - ground pin 25 vddr - rch analog power supply pin, 4.75 5.25v 26 vrefhr i rch high level voltage reference input pin 27 vreflr i rch low level voltage reference input pin 28 nc - no internal bonding. connect to gnd. 29 vrefll i lch low level voltage reference input pin 30 vrefhl i lch high level voltage reference input pin 31 vddl - lch analog power supply pin, 4.75 5.25v 32 vss2 - ground pin 33 aoutln o lch negative analog output pin 34 aoutlp o lch positive analog output pin 35 vcml - left channel common voltage pin, normally connected to vs s with a 10uf electrolytic cap. 36 nc - no internal bonding. connect to gnd. 37 nc - no internal bonding. connect to gnd. 38 nc - no internal bonding. connect to gnd. 39 nc - no internal bonding. connect to gnd. 40 vss3 - ground pin 41 avdd - analog power supply pin, 4.75 5.25v 42 mclk i master clock input pin 43 vss4 - ground pin 44 nc - no internal bonding. connect to gnd. note: all input pins except internal pull-up/down pins must not be left floating.
[AK4392] ms1045-e-02 2009/04 - 6 - handling of unused pin the unused i/o pins should be processed appropriately as below. (1) parallel mode (pcm mode only) classification pin name setting aoutlp, aoutln these pins must be open. analog aoutrp, aoutrn these pins must be open. smute this pin must be connected to vss4. tst1 this pin must be open. digital tst2 this pin must be connected to vss4. (2) serial mode 1. pcm mode classification pin name setting aoutlp, aoutln these pins must be open. analog aoutrp, aoutrn these pins must be open. dif2 these pins must be connected to vss4. digital dzfl, dzfr these pins must be open. 2. dsd mode classification pin name setting aoutlp, aoutln these pins must be open. aoutrp, aoutrn these pins must be open. analog dzfl, dzfr these pins must be open.
[AK4392] ms1045-e-02 2009/04 - 7 - absolute maximum ratings (vss1-4 =0v; note 1 ) parameter symbol min max units power supplies: analog analog digital avdd vddl/r dvdd ? 0.3 ? 0.3 ? 0.3 6.0 6.0 6.0 v v v input current, any pin except supplies iin - 10 ma digital input voltage vind ? 0.3 dvdd+0.3 v ambient temperature (power applied) ta ? 10 70 c storage temperature tstg ? 65 150 c note 1. all voltages with respect to ground. note 2. vss1-4 must be connected to the same analog ground plane. warning: operation at or beyond these limits may result in permanent damage to the device. normal operation is not guaranteed at these extremes. recommended operating conditions (vss1-4 =0v; note 1 ) parameter symbol min typ max units power supplies ( note 3 ) analog analog digital avdd vddl/r dvdd 4.75 4.75 4.75 5.0 5.0 5.0 5.25 5.25 5.25 v v v voltage reference ( note 4 ) ?h? voltage reference ?l? voltage reference vrefh ? vrefl vrefhl/r vrefll/r vref avdd ? 0.5 vss 3.0 - - - avdd - avdd v v v note 1. all voltages with respect to ground. note 3. the power up sequence between avdd, vddl/r and dvdd is not critical. note 4. the analog output voltage s cales with the vo ltage of (vrefh ? vrefl). aout (typ.@0db) = (aout+) ? (aout ? ) = 2.8vpp (vrefhl/r ? vrefll/r)/5. * akm assumes no responsibility for the usage beyond the conditions in this data sheet.
[AK4392] ms1045-e-02 2009/04 - 8 - analog characteristics (ta=25 c; avdd=vddl/r=dvdd=5.0v; vss1-4 =0 v; vrefhl/r=avdd, vrefll/r= vss; input data = 24bit; r l 1k ; bick=64fs; signal frequency = 1khz; sampling frequency = 44.1khz; measurement bandwidth = 20hz ~ 20khz; external circuit: figure 20 ; unless otherwise specified.) parameter min typ max units resolution - - 24 bits dynamic characteristics ( note 5 ) fs=44.1khz bw=20khz 0dbfs ? 60dbfs - - -103 -57 93 - db db fs=96khz bw=40khz 0dbfs ? 60dbfs - - 100 -54 - - db db thd+n fs=192khz bw=40khz bw=80khz 0dbfs ? 60dbfs ? 60dbfs 100 -54 -51 - - - db db db dynamic range ( ? 60dbfs with a-weighted) ( note 6 ) 114 120 db s/n (a-weighted) ( note 7 ) 114 120 db interchannel isolation (1khz) 110 120 db dc accuracy interchannel gain mismatch - 0.15 0.3 db gain drift ( note 8 ) - 20 - ppm/ c output voltage ( note 9 ) 2.65 2.8 2.95 vpp load capacitance - - 25 pf load resistance ( note 10 ) 1 - - k power supplies power supply current normal operation (pdn pin = ?h?) avdd + vddl/r dvdd (fs 96khz) dvdd (fs = 192khz) - - - 60 43 46 90 - 70 ma ma ma power down (pdn pin = ?l?) ( note 11 ) avdd+vddl/r+dvdd - 10 100 a note 5. measured by audio precision, system two. averaging mode. refer to the evaluation board manual. note 6. figure 20 external lpf circuit example 2. 101db for 16-bit data and 118db for 20-bit data. note 7. figure 20 external lpf circuit example 2. s/n does not depend on input data size. note 8. the voltage on (vrefh ? vrefl) is held +5v externally. note 9. full-scale voltage(0db). output volta ge scales with the voltage of (vrefhl/r ? vrefll/r). aout (typ.@0db) = (aout+) ? (aout ? ) = 2.8vpp (vrefhl/r ? vrefll/r)/5. note 10. regarding load resistance, ac load is 1k (min) with a dc cut capacitor ( figure 20 ) . dc load is 1.5k ohm (min) without a dc cut capacitor ( figure 19 ) . the load resistance value is w ith respect to ground. analog characteristics are sensitive to capacitive load that is conn ected to the output pin. therefore the capacitive load must be minimized. note 11. in the power down mode. the p/s pin = dvdd, and all other digital input pins including clock pins (mclk, bick and lrck) are held vss4.
[AK4392] ms1045-e-02 2009/04 - 9 - sharp roll-off filter characteristics (fs = 44.1khz) (ta=25 c; avdd=vddl/r=4.75 5.25v, dvdd=4.75 5.25v; normal speed mode; dem=off; sd bit=?0?) parameter symbol min typ max units digital filter passband ( note 12 ) 0.01db ? 6.0db pb 0 - 22.05 20.0 - khz khz stopband ( note 12 ) sb 24.1 khz passband ripple pr 0.005 db stopband attenuation sa 100 db group delay ( note 13) gd - 36 - 1/fs digital filter + scf frequency response: 0 20.0khz - 0.2 - db sharp roll-off filter characteristics (fs = 96khz) (ta=25 c; avdd=vddl/r=4.75 5.25v, dvdd=4.75 5.25v; double speed mode; dem=off; sd bit=?0?) parameter symbol min typ max units digital filter passband ( note 12) 0.01db ? 6.0db pb 0 - 48.0 43.5 - khz khz stopband ( note 12) sb 52.5 khz passband ripple pr 0.005 db stopband attenuation sa 95 db group delay ( note 13) gd - 36 - 1/fs digital filter + scf frequency response: 0 40.0khz - 0.3 - db sharp roll-off filter characteristics (fs = 192khz) (ta=25 c; avdd=vddl/r=4.75 5.25v, dvdd=4.75 5.25v; quad speed mode; dem=off; sd bit=?0?) parameter symbol min typ max units digital filter passband ( note 12) 0.01db ? 6.0db pb 0 - 96.0 87.0 - khz khz stopband ( note 12) sb 105 khz passband ripple pr 0.005 db stopband attenuation sa 90 db group delay ( note 13) gd - 36 - 1/fs digital filter + scf frequency response: 0 80.0khz - +0/ ? 1 - db note 12. the passband and stopband frequencies scale with fs. for example, pb=0.4535fs (@ 0.01db), sb=0.546fs. note 13. the calculating delay time which occurred by digita l filtering. this time is from setting the 16/20/24bit data of both channels to input register to the output of analog signal.
[AK4392] ms1045-e-02 2009/04 - 10 - minimum delay filter characteristics (fs = 44.1khz) (ta=25 c; avdd=vddl/r=4.75 5.25v, dvdd=4.75 5.25v; normal speed mode; dem=off; sd bit=?1?) parameter symbol min typ max units digital filter passband ( note 12) 0.01db ? 6.0db pb 0 - 22.05 20.0 - khz khz stopband ( note 12) sb 24.1 khz passband ripple pr 0.005 db stopband attenuation sa 100 db group delay ( note 13) gd - 7 - 1/fs digital filter + scf frequency response : 0 20.0khz - 0.2 - db minimum delay filter characteristics (fs = 96khz) (ta=25 c; avdd=vddl/r=4.75 5.25v, dvdd=4.75 5.25v; double speed mode; dem=off; sd bit=?1?) parameter symbol min typ max units digital filter passband ( note 12) 0.01db ? 6.0db pb 0 - 48.0 43.5 - khz khz stopband ( note 12) sb 52.5 khz passband ripple pr 0.005 db stopband attenuation sa 95 db group delay ( note 13) gd - 7 - 1/fs digital filter + scf frequency response : 0 40.0khz - 0.3 - db minimum delay filter characteristics (fs = 192khz) (ta=25 c; avdd=vddl/r=4.75 5.25v, dvdd=4.75 5.25v; quad speed mode; dem=off; sd bit=?1?) parameter symbol min typ max units digital filter passband ( note 12) 0.01db ? 6.0db pb 0 - 96.0 87.0 - khz khz stopband ( note 12) sb 105 khz passband ripple pr 0.005 db stopband attenuation sa 90 db group delay ( note 13) gd - 7 - 1/fs digital filter + scf frequency response : 0 80.0khz - +0/ ? 1 - db
[AK4392] ms1045-e-02 2009/04 - 11 - dc characteristics (ta=25 c; avdd=vddl/r=4.75 5.25v, dvdd=4.75 5.25v) parameter symbol min typ max units high-level input voltage low-level input voltage vih vil 2.4 - - - - 0.8 v v high-level output voltage (iout= ? 100 a) low-level output voltage (iout=100 a) voh vol dvdd ? 0.5 - - - - 0.5 v v input leakage current ( note 14) iin - - 10 a note 14. the tst1/cad0 and psn pins have internal pull-up devices, nominally 100k . therefore the tst1/cad0 and psn pins are not included.
[AK4392] ms1045-e-02 2009/04 - 12 - switching characteristics (ta=25 c; avdd=vddl/r=4.75 5.25v, dvdd=4.75 5.25v) parameter symbol min typ max units master clock timing frequency duty cycle fclk dclk 7.7 40 41.472 60 mhz % lrck frequency ( note 15 ) 1152fs, 512fs or 768fs 256fs or 384fs 128fs or 192fs duty cycle fsn fsd fsq duty 30 54 108 45 54 108 216 55 khz khz khz % pcm audio interface timing bick period 1152fs, 512fs or 768fs 256fs or 384fs 128fs or 192fs bick pulse width low bick pulse width high bick ? ? to lrck edge ( note 16 ) lrck edge to bick ? ? ( note 16 ) sdata hold time sdata setup time tbck tbck tbck tbckl tbckh tblr tlrb tsdh tsds 1/128fsn 1/64fsd 1/64fsq 30 30 20 20 20 20 ns ns ns ns ns ns ns ns ns external digital filter mode bick period bck pulse width low bck pulse width high bck ? ? to wck edge wck edge to bck ? ? wck pulse width low wck pulse width high data hold time data setup time tb tbl tbh tbw twb twck twch tdh tds 27 10 10 5 5 54 54 5 5 ns ns ns ns ns ns ns ns ns dsd audio interface timing dclk period dclk pulse width low dclk pulse width high dclk edge to dsdl/r ( note 17 ) tdck tdckl tdckh tddd 1/64fs 160 160 ? 20 20 ns ns ns ns control interface timing cclk period cclk pulse width low pulse width high cdti setup time cdti hold time csn high time csn ? ? to cclk ? ? cclk ? ? to csn ? ? tcck tcckl tcckh tcds tcdh tcsw tcss tcsh 200 80 80 50 50 150 50 50 ns ns ns ns ns ns ns ns reset timing pdn pulse width ( note 18) tpd 150 ns
[AK4392] ms1045-e-02 2009/04 - 13 - note 15. when the 1152fs, 512fs or 768fs /256fs or 384fs /128fs or 192fs are switched, the AK4392 should be reset by the pdn pin or rstn bit. note 16. bick rising edge must not occur at the same time as lrck edge. note 17. dsd data transmitting device must meet this time. note 18. the AK4392 can be reset by bringing the pdn pin ?l? to ?h? upon power-up. timing diagram 1/fclk tclkl vih tclkh mclk vil dclk=tclkh x fclk, tclkl x fclk 1/fs vih lrck vil tbck tbckl vih tbckh bick vil 1/fs vih wck vil tb tbl vih tbh bck vil clock timing
[AK4392] ms1045-e-02 2009/04 - 14 - tlrb lrck vih bick vil tsds vih sdata vil tsdh vih vil tblr audio interface timing (pcm mode) vih dclk vil tddd vih dsdl dsdr vil tdckh tdckl tdck audio serial interface timing (dsd normal mode, dckb bit = ?0?) vih dclk vil tddd vih dsdl dsdr vil tdckh tdckl tdck tddd audio serial interface timing (dsd ph ase modulation mode, dckb bit = ?0?)
[AK4392] ms1045-e-02 2009/04 - 15 - tcss csn vih cclk vil vih cdti vil vih vil c1 c0 r/w a4 tcckl tcckh tcds tcdh write command input timing csn vih cclk vil vih cdti vil vih vil d3 d2 d1 d0 tcsw tcsh write data input timing
[AK4392] ms1045-e-02 2009/04 - 16 - tpd pdn vil power down & reset timing twb wck vih bck vil tds vih data vil tdh vih vil tbw external digital filter i/f mode
[AK4392] ms1045-e-02 2009/04 - 17 - operation overview d/a conversion mode in serial mode, the AK4392 can perform d/a conversion for either pcm data or dsd data. the d/p bit controls pcm/dsd mode. when dsd mode, dsd data can be input from dclk, dsdl and dsdr pins. when pcm mode, pcm data can be input from bick, lrck and sdata pins. when pcm/dsd mode is changed by d/p bit, the AK4392 should be reset by rstn bit. it takes about 2/fs to 3/fs to change the mode. in parallel mode, the AK4392 performs for only pcm data. dp bit interface 0 pcm 1 dsd table 1. pcm/dsd mode control when dp bit= ?0?, an internal digital filter or external digi tal filter can be selected. when using an external digital filter (ex df i/f mode), data is input to each mclk, bck, wck, dinl and dinr pin. exdf bit controls the modes. when switching internal and external digital f ilters, the AK4392 must be reset by rstn bit. a digital filter switching takes 2~3k/fs. ex df bit interface 0 pcm 1 ex df i/f table 2. digital filter control (dp bit = ?0?) system clock [1] pcm mode the external clocks, which are required to operate th e AK4392, are mclk, bick and lrck. mclk should be synchronized with lrck but the phase is not critical. the mclk is used to operate the digital interpolation filter and the delta-sigma modulator. sampling speed and mclk frequency ar e detected automatically and then the initial master clock is set to the appropriate frequency ( table 3 ). when external clocks are changed, the AK4392 should be reset by the pdn pin or rstn bit. the AK4392 is automatically placed in reset state when mclk and lrck are stopped during a normal operation (pdn pin =?h?), and the analog output becomes hi-z. when mclk and lrck are input again, the AK4392 exit reset state and starts the operation. after exit ing system reset (pdn pin =?l? ?h?) at power-up and other situations, the AK4392 is in power-down mode until mclk and lrck are supplied. the mclk frequency corresponding to each sampling speed should be provided ( table 4 ). mclk mode sampling rate 1152fs normal 30khz~32khz 512fs 768fs normal 30khz~54khz 256fs 384fs double 30khz~108khz 128fs 192fs quad 108khz~216khz table 3. sampling speed
[AK4392] ms1045-e-02 2009/04 - 18 - lrck mclk (mhz) fs 128fs 192fs 256fs 384fs 512fs 768fs 1152fs 32.0khz n/a n/a 8.1920 12.2880 16.3840 24.5760 36.8640 44.1khz n/a n/a 11.2896 16.9344 22.5792 33.8688 n/a 48.0khz n/a n/a 12.2880 18.4320 24.5760 36.8640 n/a 88.2khz n/a n/a 22.57 92 33.8688 n/a n/a n/a 96.0khz n/a n/a 24.57 60 36.8640 n/a n/a n/a 176.4khz 22.5792 33.86 88 n/a n/a n/a n/a n/a 192.0khz 24.5760 36.86 40 n/a n/a n/a n/a n/a table 4. system clock example (parallel control mode) (n/a: not available) mclk= 256fs/384fs supports sampling rate of 30khz~108khz ( table 5 ). but, when the sampling rate is 30khz~54khz, dr and s/n will degrade by approximately 3db as compared to when mclk= 512fs/768fs. mclk dr,s/n 256fs/384fs 117db 512fs/768fs 120db table 5. relationship between mclk frequency and dr, s/n (fs= 44.1khz) [2] dsd mode the external clocks, which ar e required to operate the AK4392, are mclk and dclk. mclk should be synchronized with dclk but the phase is not critical. th e frequency of mclk is set by dcks bit. the AK4392 is automatically placed in reset state when mclk is stopped during a normal operation (pdn pin =?h?), and the analog output becomes hi-z. after exiting system reset (pdn pin =?l? ?h?) at power-up and other situations, the AK4392 is in power-down m ode until mclk is supplied. dcks bit mclk frequency dclk frequency 0 512fs 64fs (default) 1 768fs 64fs table 6. system clock (dsd mode)
[AK4392] ms1045-e-02 2009/04 - 19 - audio interface format [1] pcm mode data is shifted in via the sdata pin using bick and lrck inputs. eight data formats are supported and selected by the dif2-0 pins (parallel control mode) or dif2-0 bits (serial control mode) as shown in table 7 . in all formats the serial data is msb-first, 2's compliment format and is latched on the rising edge of bick. mode 2 can be used for 20-bit and 16-bit msb justified formats by zeroing the unused lsbs. settings shou ld be made by dif2-0 pins in parallel mode and dif2-0 bits in serial mode. mode dif2 dif1 dif0 i nput format bick figure 0 0 0 0 16bit lsb justified 32fs figure 1 1 0 0 1 20bit lsb justified 48fs figure 2 2 0 1 0 24bit msb justified 48fs figure 3 (default) 3 0 1 1 24bit i 2 s compatible 48fs figure 4 4 1 0 0 24bit lsb justified 48fs figure 2 5 1 0 1 32bit lsb justified 64fs figure 5 6 1 1 0 32bit msb justified 64fs figure 6 7 1 1 1 32bit i 2 s compatible 64fs figure 7 table 7. audio interface format sdat a bick lrck sdat a 15 14 6 5 4 bick 0 1 10 11 12 13 14 15 0 1 10 11 12 13 14 15 0 1 3210 1514 ( 32fs ) ( 64fs ) 014 1 15 16 17 31 0 1 14 15 16 17 31 0 1 15 14 0 15 14 0 mode 0 don?t care don?t care 15:msb, 0:lsb mode 0 15 14 6 5 4 3 2 1 0 lch data rch data figure 1. mode 0 timing sdat a lrck bick ( 64fs ) 09 1 10 11 12 31 0 1 9 10 11 12 31 0 1 19 0 19 0 mode 1 don?t care don?t care 19:msb, 0:lsb sdat a mode 4 23:msb, 0:lsb 20 19 0 20 19 0 don?t care don?t care 22 21 22 21 lch data rch data 8 23 23 8 figure 2. mode 1/4 timing
[AK4392] ms1045-e-02 2009/04 - 20 - lrck bick ( 64fs ) sdat a 022 1 2 24 31 0 1 31 0 1 23:msb, 0:lsb 22 1 0 don?t care 23 lch data rch data 23 30 22 224 23 30 22 1 0 don?t care 23 22 23 figure 3. mode 2 timing lrck bick ( 64fs ) sdat a 03 1 2 24 31 0 1 31 0 1 23:msb, 0:lsb 22 1 0 don?t care 23 lch data rch data 23 25 3 224 23 25 22 1 0 don?t care 23 23 figure 4. mode 3 timing lrck bick(128fs) sdata 0 1 2 20 21 22 32 33 63 0 1 2 20 21 22 32 33 63 0 1 0 31 1 bick(64fs) sdata 0 1 2 12 13 14 23 24 31 0 1 2 12 13 14 23 24 31 0 31 1 30 9 31 30 20 19 18 9 31 20 19 18 31: msb, 0:lsb 8 0 1 8 0 1 lch data rch data 0 31 1 figure 5. mode 5 timing
[AK4392] ms1045-e-02 2009/04 - 21 - lrck bick(128fs) sdata 0 1 2 20 21 22 32 33 63 0 1 2 20 21 22 32 33 63 0 31 1 30 0 31 30 12 11 10 0 31 12 11 10 bick(64fs) sdata 0 1 2 12 13 14 23 24 31 0 1 2 12 13 14 23 24 31 0 31 1 30 9 31 30 20 19 18 9 31 20 19 18 31: msb, 0:lsb 8 0 1 8 0 1 lch data rch data figure 6. mode 6 timing lrck bick(128fs) sdata 0 1 2 20 21 22 33 34 63 0 1 2 20 21 22 33 34 63 0 1 31 0 31 13 12 11 0 13 12 11 bick(64fs) sdata 0 1 2 12 13 14 24 25 31 0 1 2 12 13 14 24 25 31 0 0 1 31 9 031 212019 9 0 21 20 19 31: msb, 0:lsb 8 1 2 8 1 2 lch data rch data figure 7. mode 7 timing [2] dsd mode in case of dsd mode, dif2-0 pins and dif2-0 bits are ignored. the frequency of dclk is fixed to 64fs. dckb bit can invert the polarity of dclk. dclk (64fs) dckb=1 dclk (64fs) dckb=0 dsdl,dsdr normal dsdl,dsdr phase modulation d1 d0 d1 d2 d0 d2 d3 d1 d2 d3 figure 8. dsd mode timing
[AK4392] ms1045-e-02 2009/04 - 22 - [3] external digital filter mode (ex df i/f mode) dw indicates the number of bck in one wck cycle. the audio data is input by mclk, bck and wck from the dinl and dinr pins. three formats are available ( table 9 ) by dif2-0 bits setting. the data is latched on the rising edge of bck. the bck and mclk clocks must be the same frequency and must not burst. bck and mclk frequencies for each sampling speed are shown in table 8 . the AK4392 is automatically placed in reset state when mclk and wck are st opped during a norm al operation (pdn pin =?h?), and the analog output becomes hi-z. when mclk and wck are input again, the AK4392 exit reset state and starts the operation. after exit ing system reset (pdn pin =?l? ?h?) at power-up and other situations, the AK4392 is in power-down mode until mclk and wck are supplied. mclk&bck [mhz] sampling speed[khz] 128fs 192fs 256fs 384fs 512fs 768fs wck ecs n/a n/a n/a n/a 22.5792 33.8688 16fs 44.1(30~54) 32 48 dw 0 n/a n/a 11.2896 16.9344 n/a 33.8688 8fs 44.1(30~54) 32 48 96 dw 1 n/a n/a 24.576 36.864 n/a n/a 8fs 96(54~108) 32 48 dw 0 12.288 18.432 n/a 36.864 n/a n/a 4fs 96(54~108) 32 48 96 dw 1 24.576 36.864 n/a n/a n/a n/a 4fs 192(108~216) 32 48 dw 0 n/a 36.864 n/a n/a n/a n/a 2fs 192(108~216) 96 dw 1 table 8 system clock example (ex df i/f mode) (n/a: not available) mode dif2 dif1 dif0 input format 0 0 0 0 16bit lsb justified 1 0 0 1 n/a 2 0 1 0 n/a 3 0 1 1 n/a 4 1 0 0 24bit lsb justified 5 1 0 1 32bit lsb justified 6 1 1 0 n/a 7 1 1 1 n/a table 9 audio interface format (ex df i/f mode) (n/a: not available)
[AK4392] ms1045-e-02 2009/04 - 23 - bck wck dinl or dinr 23 22 bck 0 1 8 9 10 11 16 17 26 27 28 29 30 31 0 1 21 20 17 16 0 5 1 6 7 8 47 48 49 65 92 93 94 95 0 1 31 30 3 1 0 15 14 6 5 4 3 2 1 0 don?t care don?t care dinl or dinr 2 31 24 don?t care don?t care bck 0 5 1 6 7 8 23 24 25 17 44 45 46 47 0 1 3 1 0 don?t care dinl or dinr 2 31 don?t care don?t care don?t car e 1/16fs or 1/8fs or 1/4fs or 1/2fs figure 9 ex df i/f mode timing
[AK4392] ms1045-e-02 2009/04 - 24 - d/a conversion mode switching timing rstn bit d/a data d/a mode 4/fs 0 pcm data dsd data pcm mode dsd mode figure 10. d/a mode switching timing (pcm to dsd) rstn bit d/a data d/a mode 4/fs dsd data pcm data dsd mode pcm mode figure 11. d/a mode switching timing (dsd to pcm) note. the signal range is identified as 25% ~ 75% duty ratios in dsd mode. dsd signal must not go beyond this duty range at the sacd format book (scarlet book). de-emphasis filter a digital de-emphasis filter is available for 32khz, 44.1khz or 48khz sampling rates (tc = 50/15s) and is enabled or disabled with dem1-0 pins or dem1-0 bits. in case of 256fs/384fs and 128fs/192fs, the digital de-emphasis filter is always off. when dsd mode, dem1-0 bits are ignored. the setting value is held even if pcm mode and dsd mode are switched. dem1 dem0 mode 0 0 44.1khz 0 1 off (default) 1 0 48khz 1 1 32khz table 10. de-emphasis control output volume the AK4392 includes channel independent digital output volumes (att) with 255 levels at linear step including mute. these volume control is in front of the dac and it can attenuate the input data from 0db to ?127db and mute. when changing output levels, transitions are executed in soft chan ge; thus no switching noise occurs during these transitions.
[AK4392] ms1045-e-02 2009/04 - 25 - zero detection (pcm mode, dsd mode) the AK4392 has channel-independent zeros detect function. when the input data at each channel is continuously zeros for 8192 lrck cycles, the dzf pin of eac h channel goes to ?h?. the dzf pin of each channel immediately return to ?l? if the input data of each channel is not zero after going to ?h?. if the rstn bit is ?0?, the dzf pins of both channels go to ?h?. the dzf pins of both channels go to ?l? at 4 ~ 5/fs after rstn bit returns to ?1?. if dzfm bit is set to ?1?, the dzf pins of both channels go to ?h? only when the input data for both channels are continuously zeros for 8192 lrck cycles. the zero detect function can be disabled by setting the dzfe bit. in this case, dzf pins of both channels are always ?l?. the dzfb bit can invert the polarity of the dzf pin. mono output the AK4392 can select input/output for both output channels by setting the mono bit and s ellr bit. this function is available for any audio format. mono bit sellr bit lch out rch out 0 0 lch in rch in 0 1 rch in lch in 1 0 lch in lch in 1 1 rch in rch in table 11 mono mode output select
[AK4392] ms1045-e-02 2009/04 - 26 - soft mute operation the soft mute operation is performed at digital domain. when the smute pin goes to ?h? or the smute bit set to ?1?, the output signal is attenuated by ? during att_data att transition time from the current att level. when the smute pin is returned to ?l? or the smute bit is returned to ?0?, the mute is cancelled and the output attenuation gradually changes to the att level during att_data att transition time. if the soft mute is cancelled before attenuating ? after starting the operation, the attenuation is discontinued and returned to att level by the same cycle. the soft mute is effective for changing the signa l source without stopping the signal transmission. smute pin or smute bit a ttenuation dzf pin att_level - a out 8192/fs gd gd (1) (2) (3) (4) (1) (2) notes: (1) att_data att transition time. for example, this time is 1020lrck cycles (1020/fs) at att_data=255 in normal speed mode. (2) the analog output corresponding to the digital input has group delay (gd). (3) if the soft mute is cancelled before attenuating ? after starting the operation, the attenuation is discontinued and returned to att level by the same cycle. (4) when the input data for each channel is continuously zeros for 8192 lrck cycles, the dzf pin for each channel goes to ?h?. the dzf pin immediately retu rns to ?l? if input data are not zero. figure 12. soft mute function system reset the AK4392 should be reset once by bringing the pdn pin = ?l? upon power-up. it initializes register settings of the device. the AK4392 exits this system reset (power-down mode) by mclk and lrck after the pdn pin = ?h?, and the analog block exits power-down mode. the digital block exits power-down mode after the internal counter counts mclk for 4/fs.
[AK4392] ms1045-e-02 2009/04 - 27 - power on/off timing the AK4392 is placed in the power-down mode by bringing the pdn pin ?l? and the registers are initialized. the analog outputs are floating (hi-z). as some click noise occurs at the edge of the pdn pin signal, the analog output should be muted externally if the click noise influences system application. the dac can be reset by setting rstn bit to ?0?. in this case, the registers are not initialized and the corresponding analog outputs go to vcml/r. as some click noise occurs at th e edge of rstn signal, the an alog output should be muted externally if click noise averse ly affect system performance. pdn pin power reset normal operation clock in mclk,lrck,bick dac in (digital) dac out (analog) external mute mute on (6) dzfl/dzfr don?t care ?0?data gd (2) (4) (5) (7) gd (4) mute on ?0?data don?t care internal state (3) (3) (1) notes: (1) after avdd and dvdd are powered-up, the pdn pin should be ?l? for 150ns. (2) the analog output corresponding to digital input has group delay (gd). (3) analog outputs are floating (hi-z) in power-down mode. (4) click noise occurs at the edge of pdn signal. th is noise is output even if ?0? data is input. (5) mclk, bick and lrck clocks can be stopped in power-down mode (pdn pin= ?l?). (6) mute the analog output externally if click noise (3) adversely affect system performance the timing example is shown in this figure. (7) dzfl/r pins are ?l? in the power-down mode (pdn pin = ?l?). figure 13. power-down/up sequence example
[AK4392] ms1045-e-02 2009/04 - 28 - reset function (1) reset by rstn bit = ?0? when the rstn bit = ?0?, the AK4392?s di gital block is powered down, but the internal register values are not initialized. in this time, the analog outputs go to vc ml/r voltage and dzfl/dzfr pins are ?h?. figure 14 shows an example of reset by rstn bit. internal state rstn bit d igital block p d normal o peration gd gd ?0 ? d a t a d/a out (analog) d/a in (digital) (1) (3) dzf (3) (1) (2) normal operation 2/ fs(4 ) internal rstn bit 2~3/fs (5) 3~4/fs (5) (6) notes: (1) the analog output corresponding to digital input has group delay (gd). (2) analog outputs settle to vcom voltage. (3) small pop noise occurs at the edges(? ?) of the internal timing of rstn bit. this noise is output even if ?0? data is input. (4) the dzf pins change to ?h? when the rstn bit becomes ?0?, and return to ?l? at 2/fs after rstn bit becomes ?1?. (5) there is a delay, 3~4/fs from rstn bit ?0? to the inte rnal rstn bit ?0?, and 2~3/fs from rstn bit ?1? to the internal rstn bit ?1?. (6) mute the analog output externally if click noise (3) and hi-z (2) adversely affect system performance figure 14. reset sequence example 1
[AK4392] ms1045-e-02 2009/04 - 29 - (2) reset by mclk or lrck/wck stop the AK4392 is automatically placed in reset state when mclk or lrck is stopped during pdm mode (rstn pin =?h?), and the analog outputs are floating (hi-z). when mclk and lrck are input again, the AK4392 exits reset state and starts the operation. zero detect function is disable when mclk or lrck is stopped. in dsd mode the AK4392 is in reset state when mclk is stopped, and it is in reset stat e when mclk and wck are stopped in external digital filter mode. normal o peration internal state digital circuit p ower-down normal operation gd gd d/a out (analog) d/a in (digital) clock in mclk , bick, lrck (2) (3) externa l mute (6) (5) (2) mclk, bick, lrck stop rstb pin power-down power-down (4) (4) (4) hi-z (6) (5) (1) avdd pin dvdd pin (6) notes: (1) after avdd and dvdd are powered-up, the pdn pin should be ?l? for 150ns. (2) the analog output corresponding to digital input has group delay (gd). (3) the digital data can be stopped. click noise after mclk, bick and lrck are input again can be reduced by inputting ?0? data during this period. (4) click noise occurs within 3 ~ 4lrck cycles from the riding edge (? ?) of the pdn pin or mclk inputs. this noise occurs even when ?0? data is input. (5) clocks (mclk, bick, lrck) can be stopped in the reset state (mclk or lrck is stopped). (6) mute the analog output externally if click noise (4) in fluences system applications. the timing example is shown in this figure. figure 15. reset sequence example 2
[AK4392] ms1045-e-02 2009/04 - 30 - register control interface pins (parallel control mode) or registers (serial control mode ) can control the functions of the AK4392. in parallel control mode, the register setting is ignored, and in serial control mode the pin settings are ignored. when the state of the psn pin is changed, the AK4392 should be reset by the pdn pin. the se rial control interface is enabled by the psn pin = ?l?. in this mode, pin settings must be all ?l?. internal registers may be written to through3-wire p interface pins: csn, cclk and cdti. the data on this in terface consists of chip addres s (2-bits, c1/0), read/write (1 -bit; fixed to ?1?), register address (msb first, 5-bits) and control data (msb first, 8-b its). the AK4392 latches the data on the rising edge of cclk, so data should be clocked in on the falling edge. the writing of data is valid when csn ? ?. the clock speed of cclk is 5mhz (max). function parallel control mode serial control mode audio format y y de-emphasis y y smute y y dsd mode - y ex df i/f - y minimum delay filter - y digital attenuator - y table 12. function list1 (y: available, -: not available) setting the pdn pin to ?l? resets the registers to their default values. in serial control mode , the internal timing circuit is reset by the rstn bit, but the registers are not initialized. cdti cclk c1 0 1234567 8 9 10 11 12 13 14 15 d4 d5 d6 d7 a1 a2 a3 a4 r/w c0 a0 d0 d1 d2 d3 csn c1-c0: chip address (c1 bit =cad1 pin, c0 bit =cad0 pin) r/w: read/write (fixed to ?1?, write only) a4-a0: register address d7-d0: control data figure 16. control i/f timing * the AK4392 does not support the read command. * when the AK4392 is in power down mode (pdn pin = ?l?) or the mclk is not provided, a writing into the control registers is prohibited. * the control data can not be written when the cclk rising edge is 15 times or less or 17 times or more during csn is ?l?.
[AK4392] ms1045-e-02 2009/04 - 31 - function list function default address bit pcm dsd ex df i/f attenuation level 0db 03h 04h att7-0 y y y external digital filter i/f mode disable 00h exdf y - y ex df i/f mode clock setting 16fs(fs=44.1khz) 00h esc - - y audio data interface modes 24bit msb justified 00h dif2-0 y - - data zero detect enable disable 01h dzfe y y - data zero detect mode separated 01h dzfm y y minimum delay filter enable sharp roll-off filter 01h sd y - - de-emphasis response off 01h dem1-0 y - - soft mute enable normal operation 01h smute y y y dsd/pcm mode select pc m mode 02h dp y y - master clock frequency select at dsd mode 512fs 02h dcks - y - mono mode stereo mode sel ect stereo 02h mono y y y inverting enable of dzf ?h? active 02h dzfb y y - the data selection of l channel and r channel r channel 02h sellr y y y table 13. function list2 (y: available, -: not available)
[AK4392] ms1045-e-02 2009/04 - 32 - register map addr register name d7 d6 d5 d4 d3 d2 d1 d0 00h control 1 0 exdf ecs 0 dif2 dif1 dif0 rstn 01h control 2 dzfe dzfm sd 0 0 dem1 dem0 smute 02h control 3 dp 0 dcks dckb mono dzfb sellr 0 03h lch att att7 att6 att5 att4 att3 att2 att1 att0 04h rch att att7 att6 att5 att4 att3 att2 att1 att0 notes: data must not be written into addresses from 05h to 1fh. when the pdn pin goes to ?l?, the regist ers are initialized to their default values. when rstn bit is set to ?0?, only the internal timing is re set, and the registers are not initialized to their default values. when the state of the psn pin is changed, the AK4392 should be reset by the pdn pin. register definitions addr register name d7 d6 d5 d4 d3 d2 d1 d0 00h control 1 0 exdf ecs 0 dif2 dif1 dif0 rstn default 0 0 0 0 0 1 0 1 rstn: internal timing reset 0: reset. all registers are not initialized. 1: normal operation (default) when internal clocks are changed, the AK4392 should be reset by the pdn pin or rstn bit. dif2-0: audio data interface modes ( table 7 ) initial value is ?010? (mode 2: 24-bit msb justified). ecs: ex df i/f mode clock setting ( table 8 ) 0: disable: internal digital filter mode (default) 1: enable: external digital filter mode exdf: external digital filter i/f mode (serial mode only) 0: disable: internal digital filter mode (default) 1: enable: external digital filter mode
[AK4392] ms1045-e-02 2009/04 - 33 - addr register name d7 d6 d5 d4 d3 d2 d1 d0 01h control 2 dzfe dzfm sd 0 0 dem1 dem0 smute default 0 0 0 0 0 0 1 0 smute: soft mute enable 0: normal operation (default) 1: dac outputs soft-muted. dem1-0: de-emphasis response ( table 10 ) initial value is ?01? (off). sd: minimum delay filter enable 0: sharp roll-off filter (default) 1: minimum delay filter dzfm: data zero detect mode 0: channel separated mode (default) 1: channel anded mode if the dzfm bit is set to ?1?, the dzf pins of both channels go to ?h? only when the input data at both channels are continuously zeros for 8192 lrck cycles. dzfe: data zero detect enable 0: disable (default) 1: enable zero detect function can be disabled by dzfe bit ?0?. in this case, the dzf pins of both channels are always ?l?.
[AK4392] ms1045-e-02 2009/04 - 34 - addr register name d7 d6 d5 d4 d3 d2 d1 d0 02h control 3 dp 0 dcks dckb mono dzfb sellr 0 default 0 0 0 0 0 0 0 0 sellr: the data selection of l channel and r channel, when mono mode 0: all channel output r channel data, when mono mode. (default) 1: all channel output l channel data, when mono mode. it is enabled when mono bit is ?1?, and outputs rch date to both channels when ?0?,outputs lch data to both channels when ?1?. dzfb: inverting enable of dzf 0: dzf pin goes ?h? at zero detection (default) 1: dzf pin goes ?l? at zero detection mono: mono mode stereo mode select 0: stereo mode (default) 1: mono mode when mono bit is ?1?, mono mode is enabled. dckb: polarity of dclk (dsd only) 0: dsd data is output from dclk falling edge. (default) 1: dsd data is output from dclk rising edge. dcks: master clock frequency select at dsd mode (dsd only) 0: 512fs (default) 1: 768fs dp: dsd/pcm mode select 0: pcm mode (default) 1: dsd mode when d/p bit is changed, the AK4392 should be reset by rstn bit. addr register name d7 d6 d5 d4 d3 d2 d1 d0 03h lch att att7 att6 att5 att4 att3 att2 att1 att0 04h rch att att7 att6 att5 att4 att3 att2 att1 att0 default 1 1 1 1 1 1 1 1 att7-0: attenuation level 256 levels, 0.5db step data attenuation ffh 0db feh -0.5db fdh -1.0db : : : : 02h -126.5db 01h -127.0db 00h mute (- ) the transition between set values is soft transition of 7425 levels. it takes 7424/fs (168ms@fs=44.1khz) from ffh (0db) to 00h (mute). if the pdn pin goes to ?l?, the atts are initialized to ffh. the atts are ffh when rstn bit= ?0?. when rstn return to ?1?, the atts fade to their current value. this digital attenuator is independent of soft mute function.
[AK4392] ms1045-e-02 2009/04 - 35 - system design figure 17 shows the system connection diagram. figure 19, figure 20 and figure 21 show the analog output circuit examples. the evaluation board (akd4392) demonstrates the optimum layout, power supply arrangements and measurement results. dvdd nc 1 pdn 44 2 bic k 3 sdata 4 lrck 5 csn 6 cad0 7 cclk 8 cdti 9 cad1 10 dzfl 11 vss4 43 mcl k 42 av d d 41 vss3 40 nc 39 nc 38 nc 37 nc 36 vcm l 35 aoutlp 34 dif2 12 nc 13 psn 14 dzfr 15 bck 16 nc 17 dinr 18 dinl 19 nc 20 vcmr 21 a outrp 22 33 32 31 30 29 28 27 26 25 24 23 aoutln vss2 vddl vre fhl vre fll nc vre flr vr efhr vddr vss1 aoutrn AK4392eq to p v i e w analog5.0v + 10u 0 .1u digital 5.0v 10u 0.1u + ceramic capacitor + electrolytic capacitor + 0.1 u + 10u + 10u 0 .1u + 10u 0 .1u + 10u 0.1u lch lpf rch lpf rch mute lch mute micro - controller rch out lch out reset & pd 64fs aud io data fs master cloc k 10u + 10u + a nalog gd digital notes: - chip address = ?00?. bi ck = 64fs, lrck = fs - power lines of avdd and dvdd should be distributed separa tely from the point with low impedance of regulator etc. - vss1-4 must be connected to the same analog ground plane. - when aout drives a capacitive load, some resistance should be connected in series between aout and the capacitive load. - all input pins except pull-down/pull-up pins should not be allowed to float. figure 17. typical connection diagram (avdd=vddl/r=5v, dvdd=5v, serial control mode)
[AK4392] ms1045-e-02 2009/04 - 36 - analog ground digital ground system controller dvdd nc 1 pdn 44 2 bick / dclk 3 sdata / dsdl 4 lrck / dsdr/wck 5 smute/csn 6 dfs0/cad0 7 dem0/cclk 8 dem1/cdti 9 dif0/cad1 10 dif1 / dzfl 11 dif2 12 33 a outln AK4392eq 13 14 15 16 17 18 19 20 21 22 nc psn a cks / dzfr bck nc din r dinl nc vcmr a outrp 32 vss2 31 vddl 30 vrefhl 29 vrefll 28 nc 27 vreflr 26 vrefhr 25 vddr 24 vss1 23 a outr n vss4 43 mcl k 42 avd d 41 vss3 40 nc 39 nc 38 nc 37 n c 36 vcml 35 aoutl p 34 figure 18. ground layout 1. grounding and power supply decoupling to minimize coupling by digital noise, decoupling capacitors should be connected to avdd, vddl/r and dvdd respectively. avdd and vddl/r are supplied from analog supply in system and dvdd is supplied from digital supply in system. power lines of avdd, vddl/r and dvdd should be distributed separately from the point with low impedance of regulator etc. the power up sequence between avdd, vddl/r and dvdd is not critical. vss1-4 must be connected to the same analog ground plane. decoupling capacitors for high freq uency should be placed as near as possible to the supply pin. 2. voltage reference the differential voltage between vrefhl/r and vrefll/r sets the analog output range. the vrefhl/r pin is normally connected to avdd, and the vrefll/r pin is no rmally connected to vss1/2 /3. vrefhl/r and vrefll/r should be connected with a 0.1f ceramic capacitor as near as possible to the pin to eliminat e the effects of high frequency noise. no load current may be drawn from vcml/r pin. all signals, especially clocks, should be kept away from the vrefhl/r and vrefll/r pins in order to avoid unwanted noise coupling into the AK4392. 3. analog outputs the analog outputs are full differential outputs and 2.8vpp (typ, vrefhl/r ? vrefll/r = 5v) centered around avdd/2. the differential outputs are summed externally, v aout = (aout+) ? (aout ? ) between aout+ and aout ? . if the summing gain is 1, the output range is 5.6vpp (typ, vrefhl/r ? vrefll/r = 5v). the bias voltage of the external summing circuit is supplied externally. the input data format is 2's complement. the output voltage (v aout ) is a positive full scale for 7fffffh (@24bit) and a negativ e full scale for 800000h (@24bit). the ideal v aout is 0v for 000000h(@24bit). the internal switched-capacitor filters attenuate the noise generated by the delta-sigma modulator beyond the audio passband. figure 19 shows an example of external lpf circuit su mming the differential outputs by an op-amp. figure 20 shows an example of differential outputs and lpf circuit example by three op-amps.
[AK4392] ms1045-e-02 2009/04 - 37 - 1.5k 1.5k 390 1.5k 390 1.5k 1n +vop 1n -vo p aout- aout+ 2.2n ana log ou t AK4392 figure 19. external lpf circuit example 1 for pcm (fc = 99.2khz, q=0.704) frequency response gain 20khz ? 0.011db 40khz ? 0.127db 80khz ? 1.571db table 14. frequency response of external lpf circuit example 1 for pcm 330 100u 180 a outl- 10k 3.9 n 1.2k 680 3.3n 6 4 3 2 7 10u 0.1u 0.1u 10u 10u njm5534d 330 100u 180 a outl+ 10k 3.9n 1.2k 680 3.3n 6 4 3 2 7 10u 0.1u 0.1 u 10u njm5534d 0.1u + njm5534d 0.1u 10u 100 4 3 2 1.0n 620 620 560 7 + + + + - + - + + + - + + 1.0n lch -15 +15 6 560 figure 20. external lpf circuit example 2 for pcm 1 st stage 2 nd stage total cut-off frequency 182khz 284khz - q 0.637 - - gain +3.9db -0.88db +3.02db 20khz -0.025 -0.021 -0.046db 40khz -0.106 -0.085 -0.191db frequency response 80khz -0.517 -0.331 -0.848db table 15. frequency response of external lpf circuit example 2 for pcm
[AK4392] ms1045-e-02 2009/04 - 38 - it is recommended for sacd format book (scarlet book) that th e filter response at sacd playback is an analog low pass filter with a cut-off frequency of maximum 50khz and a sl ope of minimum 30db/oct. the ak 4392 can achieve this filter response by combination of the internal filter ( table 16 ) and an external filter ( figure 21 ). frequency gain 20khz ? 0.4db 50khz ? 2.8db 100khz ? 15.5db table 16. internal filter response at dsd mode 1.8k 4.3k 1.0k 1.8k 1.0k 4.3k 270p +vop 270p -vop aout- aout+ 3300p analog out 2.0k 2.0k 2200p - + 2.8vpp 6.34vpp 2.8vpp figure 21. external 3rd order lpf circuit example for dsd frequency gain 20khz ? 0.05db 50khz ? 0.51db 100khz ? 16.8db dc gain = 1.07db table 17. 3rd order lpf ( figure 21 ) response
[AK4392] ms1045-e-02 2009/04 - 39 - package 0.10 0.145 0.055 0.37 10.0 1.60max 1 11 23 33 44pin lqfp (unit: mm) 10.0 12.0 34 44 0.80 22 12 12.0 0.10 0.05 0 ? 7 0.6 0.15 1.40 0.05 0.20 m +0.08 ?0.07 s s 1.00 material & lead finish package molding compound: epoxy, halogen (bromine and chlorine) free lead frame material: cu lead frame surface treatment: solder (pb free) plate
[AK4392] ms1045-e-02 2009/04 - 40 - marking AK4392eq xxxxxxx a km 1 1) pin #1 indication 2) akm logo 3) date code: xxxxxxx(7 digits) 4) marking code: AK4392 5) audio 4 pro logo revision history date (yy/mm/dd) revision reason page contents 09/01/09 00 first edition 09/02/25 01 error correct 37 figure 19 was changed. table 14 was changed. 09/04/27 02 description change short delay filter minimum delay filter
[AK4392] ms1045-e-02 2009/04 - 41 - important notice z these products and their specifications ar e subject to change without notice. when you consider any use or application of these produc ts, please make inquiries the sales office of asahi kasei microdevices corporation (akm) or authorized distributors as to current status of the products. z akm assumes no liability for infringement of any patent, intellect ual property, or other rights in the application or use of any information contained herein. z any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. z akm products are neither intended nor auth orized for use as critical components note1) in any safety, life support, or other hazard related device or system note2) , and akm assumes no responsibility for such use, except for the use approved with the express written consent by representative director of akm. as used here: note1) a critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. note2) a hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. z it is the responsibility of the buyer or distributor of akm products , who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility a nd liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification.

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