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asahi kasei [AK4620B] ms0401-e-00 2005/07 - 1 - general description the AK4620B is a high performance 24-bit codec that supports up to 192khz record and playback. the on-board analog-to-digital converter has a high dynamic range due to akm?s enhanced dual-bit architecture. the dac utilizes akm?s advanced multi-bi t architecture that achieves low out-of-band noise and high jitter tolerance through the use of switched capacitor filter (scf) technology. the AK4620B has an input programmable gain amplifier and is ideal for pro audio sound cards, digital audio workstations, dvd-r, hard disk, cd-r record ing/playback systems, and musical instrument recording. features ? 24-bit 2-channel adc - selectable single-ended or differential input - high performance linear phase digital anti-alias filter passband: 0 ~ 20.25khz (@fs=44.1khz) ripple: 0.005db stopband attenuation: 100db - s/(n+d): 90db (single-ended) 100db (differential) - s/n: 110db (single-ended) 113db (differential) - digital high-pass filter for offset cancellation - input pga: 0db to +18db, 0.5db/step (for single-ended input) - input digital attenuator: 0db to ? 63db, 0.5db/step - overflow flag - audio interface format: msb justified or i 2 s ? 24-bit 2-channel dac - 24-bit 8 times oversampling linear phase digital filter ripple: 0.005db stopband attenuation: 75db - switched-cap low pass filter - differential outputs - s/(n+d): 97db - s/n: 115db - de-emphasis for 32khz, 44.1khz, 48khz sampling - output digital attenuator: linear 255 steps - soft mute - zero detection function - audio interface format: msb justified, lsb justified, i 2 s, or dsd ? high jitter tolerance ? sampling rate: up to 216khz ? p interface: 3-wire serial interface ? master clock - 128fs/192fs/256fs/384f s/512fs/768fs/1024fs ? power supply: 5v 5%(analog), 3v~3.6v with 5v tolerant i/o(digital) ? small 30-pin vsop package ? ta: -10 to 70 c 24-bit 192khz audio codec with ipga AK4620B
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 2 - ? block diagram a inl+ vcom a outl+ a outl- a outr- a outr+ csn/ dif cclk / cks1 cdti/ cks0 sdti sdto bick lrck dgnd vt vd a dc dac hpf datt smute a udio i/f controller control register i/f pdn mclk ovfl/dzfl vref va a gnd ovfr/dzf r a inl-/nc a inr+ a inr-/nc a dmode dfs0 dem0 p/s datt ovf figure 1. block diagram ? compatibility with ak4528 / ak4524 function ak4524 ak4 528 AK4620B max fs 96khz 108khz 216khz adc inputs single-ended differential single-ended differential input analog pga 0db ~ +18db 0.5db/step - 0 ~ +18db 0.5db/step - input digital att mute, -72db ~ 0db pseudo-log step mute, -72db ~ 0db pseudo-log step mute,-63.5db ~ 0db 0.5db/step mute,-63.5db ~ 0db 0.5db/step adc s/(n+d) 90db 94db 90db 100db adc dr, s/n 100db 108db 110db 113db adc digital filter sa 75db 75db 100db adc overflow detection - - x dac s/(n+d) 94db 94db 97db dac dr, s/n 110db 110db 115db output digital attenuator mute, -72db ~ 0db pseudo-log step mute, -72db ~ 0db pseudo-log step mute, -48db ~ 0db linear 256 steps mute, -48db ~ 0db linear 256 steps dac dsd mode - - x dac zero-data detection - - x x?tal oscillating circuit x - - master mode x - - parallel mode - x x x: available, -: not available
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 3 - ? ordering guide AK4620Bvf -10 +70 c 30pin vsop (0.65mm pitch) akd4620b evaluation board ? pin layout 6 5 4 3 2 1 vcom a inr+ a inl+ a in r -/nc a inl-/nc vref a gnd 7 va 8 top view 10 9 p/s mclk lrck/dsdr 11 bick/dclk 12 13 14 sdto sdti/dsdl a outr+ a out r - a outl+ a outl- dgnd vd vt a dmode dem0 pdn dfs0 csn/dif 25 26 27 28 29 30 24 23 21 22 20 19 18 17 cclk/cks1 cdti/cks0 15 ovfr/dzfr 16 ovfl/dzfl
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 4 - pin/function no. pin name i/o function 1 vcom o common voltage output pin, va/2 bias voltage of adc inputs and dac outputs. 2 ainr+ i rch positive input pin i rch negative input pin (when admode pin=?h?) 3 ainr- i no connect pin (when admode pin=?l?) no internal bonding. this pin should be open. 4 ainl+ i lch positive input pin i lch negative input pin (when admode pin=?h?) 5 ainl- i no connect pin (when admode pin=?l?) no internal bonding. this pin should be open. 6 vref i voltage reference input pin, va used as a voltage reference by adc & dac. vref is connected externally to filtered va. 7 agnd - analog ground pin 8 va - analog power supply pin, 4.75 5.25v 9 p/s i parallel/serial mode select pin ?l?: serial mode, ?h?: parallel mode do not change this pin during pdn pin = ?h?. 10 mclk i master clock input pin lrck i input/output channel clock pin (in parallel mode or when d/p bit=?0? in serial mode) 11 dsdr i dsd rch data input pin (when d/p bit=?1? in serial mode) bick i audio serial data clock pin (in parallel mode or when d/p bit=?0? in serial mode) 12 dclk i dsd clock pin (when d/p bit=?1? in serial mode) 13 sdto o audio serial data output pin sdti i audio serial data input pin (in parallel mode or when d/p bit=?0? in serial mode) 14 dsdl i dsd lch data input pin (when d/p bit=?1? in serial mode) ovfr o rch over flow flag pin (in parallel mode or when zos bit=?0? in serial mode) 15 dzfr o rch zero detection flag pin (when zos bit=?1? in serial mode) ovfl o lch over flow flag pin (in parallel mode or when zos bit=?0? in serial mode) 16 dzfl o lch zero detection flag pin (when zos bit=?1? in serial mode) cdti i control data input pin (in serial mode) 17 cks0 i master clock select pin (in parallel mode) cclk i control data clock pin (in serial mode) 18 cks1 i master clock select pin (in parallel mode) csn i chip select pin in serial mode (in serial mode) 19 dif i digital audio interface select pin (in parallel mode) ?l?: 24bit msb justified, ?h?: i 2 s compatible 20 dfs0 i double speed sampling mode pin 21 pdn i power-down mode pin ?l?: power down reset and initialize the control register, ?h?: power up 22 dem0 i de-emphasis control pin 23 admode i analog input mode select pin ?l?: single-ended input & ipga enable ?h?: differential input & ipga bypass
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 5 - pin/function (continued) 24 vt - input buffer tolerant pin, 3.0 5.25v 25 vd - digital power supply pin, 3.0 3.6v 26 dgnd - digital ground pin 27 aoutl- o lch negative analog output pin 28 aoutl+ o lch positive analog output pin 29 aoutr- o rch negative analog output pin 30 aoutr+ o rch positive analog output pin note. do not allow digital input pins (p/s, mclk, lrck/dsdr, bick/dclk, sdti/dsdl, cdti/cks0, cclk/cks1, csn/dif, dfs0, pdn, dem0 and admode pins) to float. ? handling of unused pin the unused i/o pin should be processed appropriately as below. classification pin name setting ainl+, ainl-/nc, ainr+, ainr+nc these pins should be open when admode pin = ?l?. ainl+, ainl-/nc ainl+ pin is connected to ainl-/nc pin when admode pin = ?h?. analog input ainr+, ainr-/nc ainr+ pin is connected to ainr-/nc pin when admode pin = ?h?. analog output aoutl+, aoutl-, aoutr+, aoutr- these pins should be open. digital input dem0 this pin should be connected to dvss. digital output ovfl/dzfl, ovfr/dzfr these pins should be open.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 6 - absolute maximum ratings (agnd, dgnd=0v;note 1) parameter symbol min max units power supplies: analog digital input tolerant |agnd ? dgnd| (note 2) va vd vt ? gnd -0.3 -0.3 -0.3 - 6.0 6.0 6.0 0.3 v v v v input current, any pin except supplies iin - 10 ma analog input voltage (note 3) vina -0.3 va+0.3 v digital input voltage (note 4) vind -0.3 vt+0.3 v ambient temperature (powered applied) ta -10 70 c storage temperature tstg -65 150 c note 1. all voltages with respect to ground. note 2. agnd and dgnd must be connected to the same analog ground plane. note 3. ainl+, ainl-/nc, ainr+ and ainr-/nc pins note 4. p/s, mclk, lrck/dsdr, bick/dclk, sdti/dsdl, cdti/cks0, cclk/cks1, csn/dif, dfs0, pdn, dem0 and admode pins. 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 (agnd, dgnd=0v;note 1) parameter symbol min typ max units power supplies (note 5) analog digital input tolerant va vd vt 4.75 3.0 vd 5.0 3.3 5.0 5.25 3.6 5.25 v v v voltage reference vref 3.0 - va v note 5. the power up sequence among va, vd and vt is not critical. *akm assumes no responsibility for the usage beyond the conditions in this datasheet.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 7 - analog characteristics (adc: single-ended input) (ta=25 c; va=5v, vd=3.3v, vt=5v; agnd=dgnd=0v; vref=va; fs=44.1khz; signal frequency =1khz; 24bit data; measurement frequency=20hz 20khz at fs=44.1khz, 40hz 40khz at fs=96khz, 40hz 40khz at fs=192khz; unless otherwise specified) parameter min typ max units input pga characteristics: input voltage (note 6) 2.77 3.07 3.37 vpp input resistance (note 7) 0.7 5.1 - k ? step size 0.2 0.5 0.8 db gain control range 0 18 db adc analog input characteristics: ipga=0db resolution 24 bits fs=44.1khz bw=20khz -1dbfs -60dbfs 80 - 90 47 db db fs=96khz bw=40khz -1dbfs -60dbfs - - 90 44 db db s/(n+d) fs=192khz bw=40khz -1dbfs -60dbfs - - 90 44 db db dynamic range (-60dbfs with a-weighted) - 110 db s/n (a-weighted) 101 110 db interchannel isolation 90 105 db interchannel gain mismatch 0.2 0.5 db gain drift 150 - ppm/ c power supply rejection (note 8) - 50 db analog characteristics (adc: differential input) (ta=25 c; va=5v, vd=3.3v, vt=5v; agnd=dgnd=0v; vref=va; fs=44.1khz; signal frequency =1khz; 24bit data; measurement frequency=20hz 20khz at fs=44.1khz, 40hz 40khz at fs=96khz, 40hz 40khz at fs=192khz; unless otherwise specified) parameter min typ max units adc analog input characteristics: resolution 24 bits input voltage ( note 9 ) 2.62 2.82 3.02 vpp input resistance fs=44.1khz 8 14 - k ? fs=48khz - 13 - k ? fs=96khz - 13 - k ? fs=192khz - 13 - k ? fs=44.1khz bw=20khz -1dbfs -60dbfs 90 - 100 50 db db fs=96khz bw=40khz -1dbfs -60dbfs - - 100 46 db db s/(n+d) fs=192khz bw=40khz -1dbfs -60dbfs - - 100 46 db db dynamic range (-60dbfs with a-weighted) - 113 db s/n (a-weighted) 103 113 db interchannel isolation 90 120 db interchannel gain mismatch 0.1 0.5 db gain drift 20 - ppm/ c power supply rejection (note 8) - 50 db
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 8 - note 6. full scale (0db) of the input voltage at pga=0db. this voltage is proportional to vref. vin(typ) = 3.07vpp x vref/5. note 7. these values become smaller when a gain of ipga is large. ipga=0db; typ. 5.1k ? , ipga=+18db; typ. 1.18k ? note 8. psr is applied to va, vd, vt with 1khz, 50mvpp. vref pin is held a constant voltage. note 9. full scale (0db) of the input voltage at 0db. this voltage is proportional to vref. vin (typ) = 2.82vpp x vref/5. analog characteristics (dac) (ta=25 c; va=5v, vd=3.3v, vt=5v; agnd=dgnd=0v; vref=va; fs=44.1khz; signal frequency =1khz; 24bit data; measurement frequency=20hz 20khz at fs=44.1khz, 40hz 40khz at fs=96khz, 40hz 40khz at fs=192khz; unless otherwise specified) dac analog output characteristics: parameter min typ max units resolution 24 bits dynamic characteristics fs=44.1khz bw=20khz 0dbfs ? 60dbfs 87 - 97 52 db db fs=96khz bw=40khz 0dbfs ? 60dbfs - - 97 49 db db s/(n+d) fs=192khz bw=40khz 0dbfs ? 60dbfs - - 97 49 db db dynamic range ( ? 60dbfs with a-weighted) (note 10, note 11) - 115 db s/n (a-weighted) (note 11, note 12) 107 115 db interchannel isolation (1khz) 90 110 db dc accuracy interchannel gain mismatch 0.15 0.3 db gain drift (note 13) 20 - ppm/ c output voltage (note 14) 2.6 2.8 3.0 vpp load capacitance 25 pf load resistance (note 15) 3 k ? note 10. 100db at 16bit data and 114db at 20bit data. note 11. by figure 19. external lpf circuit example 2 for pcm. note 12. s/n does not depend on input bit length. note 13. the voltage on vref is held +5v externally. note 14. full-scale voltage(0db). output voltage scales with the voltage of vref. aout (typ.@0db) = (aout+) - (aout-) = 5.6vpp x vref/5. note 15. for ac-load. parameter min typ max units power supplies power supply current normal operation (pdn pin = ?h?) va: adc single-ended mode adc differential mode 60 55 90 83 ma ma vd+vt (fs=44.1khz) (fs=96khz) (fs=192khz) 11 21 27 - - 41 ma ma ma power-down mode (pdn pin = ?l?) (note 16) va vd+vt 10 10 100 100 a a note 16. all digital input pins are held vt or dgnd.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 9 - adc filter characteristics (fs=44.1khz) (ta=25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v; normal speed mode) parameter symbol min typ max units adc digital filter (decimation lpf): passband (note 17) ? 0.005db ? 0.02db ? 0.06db ? 6.0db pb 0 - - - 20.25 20.4 22.05 19.8 - - - khz khz khz khz stopband (note 17) sb 24.3 khz passband ripple pr 0.005 db stopband attenuation sa 100 db group delay (note 18) gd 43.2 1/fs group delay distortion ? gd 0 s adc digital filter (hpf): frequency response (note 17) ? 3db ? 0.1db fr 0.9 6.0 hz hz adc filter characteristics (fs=96khz) (ta=25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v; double speed mode) parameter symbol min typ max units adc digital filter (decimation lpf): passband (note 17) ? 0.005db ? 0.02db ? 0.06db ? 6.0db pb 0 - - - 44.08 44.5 48.0 43.0 - - - khz khz khz khz stopband (note 17) sb 53.0 khz passband ripple pr 0.005 db stopband attenuation sa 100 db group delay (note 18) gd 43.1 1/fs group delay distortion ? gd 0 s adc digital filter (hpf): frequency response (note 17) ? 3db ? 0.1db fr 2.0 13.0 hz hz filter characteristics (fs=192khz) (ta=25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v; quad speed mode) parameter symbol min typ max units adc digital filter (decimation lpf): passband (note 17) ? 0.005db ? 0.02db ? 0.06db ? 6.0db pb 0 - - - 88.18 89.0 96.0 86.0 - - - khz khz khz khz stopband (note 17) sb 106.0 khz passband ripple pr 0.005 db stopband attenuation sa 100 db group delay (note 18) gd 38.2 1/fs group delay distortion ? gd 0 s adc digital filter (hpf): frequency response (note 17) ? 3db ? 0.1db fr 4.0 26.0 hz hz note 17. the passband and stopband frequencies scale with fs. the reference frequency of these responses is 1khz. note 18. the calculated delay time induced by digital filtering. this time is from the input of an analog signal to the setting of 24bit data both channels to the adc output register for adc.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 10 - dac sharp roll-off filter characteristics (fs = 44.1khz) (ta = 25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v; fs = 44.1khz; normal speed mode; dem = off; slow = ?0?) parameter symbol min typ max units digital filter passband 0.01db (note 19) -6.0db pb 0 - 22.05 20.0 - khz khz stopband (note 19) sb 24.1 khz passband ripple pr 0.005 db stopband attenuation sa 75 db group delay (note 20) gd - 28 - 1/fs digital filter + scf frequency response: 0 20.0khz - 0.2 - db dac sharp roll-off filter characteristics (fs = 96khz) (ta = 25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v; fs = 96khz; double speed mode; dem = off; slow = ?0?) parameter symbol min typ max units digital filter passband 0.01db (note 19) -6.0db pb 0 - 48.0 43.5 - khz khz stopband (note 19) sb 52.5 khz passband ripple pr 0.005 db stopband attenuation sa 75 db group delay (note 20) gd - 28 - 1/fs digital filter + scf frequency response: 0 40.0khz - 0.3 - db dac sharp roll-off filter characteristics (fs = 192khz) (ta = 25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v; fs = 192khz; quad speed mode; dem = off; slow = ?0?) parameter symbol min typ max units digital filter passband 0.01db (note 19) -6.0db pb 0 - 96.0 87.0 - khz khz stopband (note 19) sb 105 khz passband ripple pr 0.005 db stopband attenuation sa 75 db group delay (note 20) gd - 28 - 1/fs digital filter + scf frequency response: 0 80.0khz - +0/-1 - db note 19. the passband and stopband frequencies scale with fs. for example, pb = 0.4535fs (@ 0.01db), sb = 0.546fs. note 20. delay time caused by digital filtering. this time is from setting the 16/20/24bit data of both channels to input register to the output of analog signal.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 11 - dac slow roll-off filter characteristics (fs = 44.1khz) (ta = 25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v; fs = 44.1khz; normal speed mode; dem = off; slow = ?1?) parameter symbol min typ max units digital filter passband 0.04db (note 21) -3.0db pb 0 - 18.2 8.1 - khz khz stopband (note 21) sb 39.2 khz passband ripple pr 0.005 db stopband attenuation sa 72 db group delay (note 20) gd - 28 - 1/fs digital filter + scf frequency response: 0 20.0khz - +0/-5 - db dac slow roll-off filter characteristics (fs = 96khz) (ta = 25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v; fs = 96khz; double speed mode; dem = off; slow = ?1?) parameter symbol min typ max units digital filter passband 0.04db (note 21) -3.0db pb 0 - 39.6 17.7 - khz khz stopband (note 21) sb 85.3 khz passband ripple pr 0.005 db stopband attenuation sa 72 db group delay (note 20) gd - 28 - 1/fs digital filter + scf frequency response: 0 40.0khz - +0/-4 - db dac slow roll-off filter characteristics (fs = 192khz) (ta = 25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v; fs = 192khz; quad speed mode; dem = off; slow = ?1?) parameter symbol min typ max units digital filter passband 0.04db (note 21) -3.0db pb 0 - 79.1 35.5 - khz khz stopband (note 21) sb 171 khz passband ripple pr 0.005 db stopband attenuation sa 72 db group delay (note 20) gd - 28 - 1/fs digital filter + scf frequency response: 0 80.0khz - +0/-5 - db note 21. the passband and stopband frequencies scale with fs. for example, pb = 0.185fs (@ 0.04db), sb = 0.888fs.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 12 - digital characteristics (ta=25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v) parameter symbol min typ max units high-level input voltage low-level input voltage vih vil 70%vd - - - vt 30%vd v v high-level output voltage (iout=-100 a) low-level output voltage (iout=100 a) voh vol vd-0.5 - - - - 0.5 v v input leakage current iin - - 10 a switching characteristics (ta=25 c; va=4.75 5.25v; vd=3.0 3.6v, vt=3.0 5.25v; c l =20pf) parameter symbol min typ max units master clock timing frequency pulse width low pulse width high fclk tclkl tclkh 8.192 0.4/fclk 0.4/fclk 55.296 mhz ns ns lrck frequency (note 22) normal speed mode (dfs0=?0?, dfs1=?0?) double speed mode (dfs0=?1?, dfs1=?0?) quad speed mode (dfs0=?0?, dfs1=?1?) duty cycle fsn fsd fsq 32 54 108 45 54 108 216 55 khz khz khz % pcm audio interface timing bick period normal speed mode double speed mode quad speed mode bick pulse width low pulse width high lrck edge to bick ? ? (note 23) bick ? ? to lrck edge (note 23) lrck to sdto (msb) (except i 2 s mode) bick ? ? to sdto sdti hold time sdti setup time tbck tbck tbck tbckl tbckh tlrb tblr tlrs tbsd tsdh tsds 1/128fsn 1/64fsd 1/64fsq 33 33 20 20 20 20 20 20 ns ns ns ns ns ns ns ns ns ns ns dsd audio interface timing dclk period dclk pulse width low pulse width high dclk edge to dsdl/r (note 24) tdck tdckl tdckh tddd 1/64fs 160 160 -20 20 ns ns ns ns note 22. when the normal/double/quad speed modes are switched, the AK4620B should be reset by pdn pin or rstn bit. note 23. bick rising edge must not occur at the same time as lrck edge. note 24. dsd data transmitting device must meet this time.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 13 - parameter symbol min typ max units control interface timing cclk period cclk pulse width low pulse width high cdti setup time cdti hold time csn ?h? 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 25) rstad ? ? to sdto valid (note 26) tpd tpdv 150 516 ns 1/fs note 25. the AK4620B can be reset by bringing pdn pin ?l?. note 26. these cycles are the number of lrck rising from rstad bit.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 14 - ? timing diagram 1/fclk tclkl vih tclkh mclk vil 1/fs lrck vih vil tbck tbckl vih tbckh bick vil clock timing lrck bick sdto sdti tblr tlrb tlrs tbsd tsds tsdh vih vil vih vil 50%vd vih vil audio interface timing (pcm mode)
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 15 - 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 phase modulation mode, dckb bit = ?0?)
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 16 - 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 tpd pdn vil power down & reset timing
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 17 - operation overview ? d/a conversion mode in serial mode, the AK4620B can digitize either pcm data or dsd data. the p/d bit controls pcm/dsd mode. when dsd mode, dsd data input occurs on dclk, dsdl and dsdr pins. the adc and ipga are in power down mode. in pcm mode, pcm data input occurs on bick, sdti and lrck pins. when pcm/dsd mode changes (d/p bit), the AK4620B should be reset by setting rstad and rstda bits to ?0? or by grounding the pdn pin. it takes from 2/fs to 3/fs to change the mode. in parallel mode, AK4620B can only process pcm data. d/p bit dac mode adc mode 0 pcm pcm 1 dsd power down table 1. dsd/pcm mode control ? system clock input 1. pcm mode AK4620B requires mclk, bick and lrck external clocks. mclk should be synchronized with lrck but the phase is not critical. external clocks (mclk, bick and lrck) should always be present whenever the AK4620B is in normal operation mode (pdn pin = ?h? and either the adc and dac is in normal operation mode). if these clocks are not provided, the AK4620B may draw excess current due to dynamic re fresh of internal logic. if the external clocks are not present, the AK4620B should be in the power-down mode (pdn pin = ?l? or power down both the adc and dac by the register). after exiting reset (pdn pin = ?l? ? ?h?) at power-up etc., the AK4620B is in power-down mode until mclk and lrck are provided. as the AK4620B includes the phase detect circuit for lrck, the AK4620B is reset automatically when the synchronization is out of phase by changing the clock frequencies. 1-1. serial mode (p/s pin= ?l?) as shown in table 2, table 3 and table 4, select the mclk frequency by setting cmode, cks0-1 and dfs0-1 (dfs0 bit and dfs0 pin are internally ord). these registers are changed when rstad bit = rstda bit = ?0?. dfs1 bit or of dfs0 bit / dfs0 pin mode sampling rate 0 0 normal speed 32khz-54khz default 0 1 double speed 54khz-108khz 1 0 quad speed 108khz-216khz 1 1 n/a - table 2. sampling speed in serial mode
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 18 - cmode bit cks1 bit cks0 bit mclk normal speed (dfs1-0 = ?00?) mclk double speed (dfs1-0 = ?01?) mclk quad speed (dfs1-0 = ?10?) 0 0 0 256fs n/a n/a default 0 0 1 512fs 256fs 128fs 0 1 0 1024fs 512fs 256fs 0 1 1 n/a auto setting mode (*) n/a 1 0 0 384fs n/a n/a 1 0 1 768fs 384fs 192fs table 3. master clock frequency in serial mode (?*?: refer to table 4) the auto setting mode detects mclk/lrck ratio and selects normal/double/quad speed mode automatically. mclk/lrck ratio mode sampling rate 512 or 768 normal speed 32khz-54khz 256 or 384 double speed 54khz-108khz 128 or 192 quad speed 108khz-216khz table 4. auto setting mode in serial mode (dfs1-0 = ?01?, cmode bit = ?0?, cks1-0 bit = ?11?) 1-2. parallel mode (p/s pin= ?h?) as shown in table 5, table 6 and table 7, select the mclk frequency with the cks0-1 and dfs0 pins. these pins should be changed when the pdn pin = ?l?. dfs0 pin mode sampling rate l normal speed 32khz-54khz h double speed 54khz-108khz table 5. sampling speed in parallel mode cks1 pin cks0 pin mclk normal speed (dfs0 pin = ?l?) mclk double speed (dfs0 pin = ?h?) l l 256fs n/a l h 512fs 256fs h l 384fs auto setting mode (*) h h 1024fs 512fs table 6. master clock frequency in parallel mode (?*?; refer to table 7.) the auto setting mode detects mclk/lrck ratio and selects normal/double/quad speed mode automatically. mclk/lrck ratio mode sampling rate 512 or 768 normal speed 32khz-54khz 256 or 384 double speed 54khz-108khz 128 or 192 quad speed 108khz-216khz table 7. auto setting mode in parallel mode (dfs0 pin = ?h?, cks1 pin = ?h?, cks0 pin = ?l?)
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 19 - mclk (normal speed) fs=44.1khz fs=48khz mclk (double speed) fs=88.2khz fs=96khz 256fs 11.2896mhz 12.288mhz n/a n/a n/a 512fs 22.5792mhz 24.576mhz 256fs 22.5792mhz 24.576mhz 1024fs 45.1584mhz 49.152mhz 512fs 45.1584mhz 49.152mhz 384fs 16.9344mhz 18.432mhz n/a n/a n/a 768fs 33.8688mhz 36.864mhz 384fs 33.8688mhz 36.864mhz mclk (quad speed) fs=176.4khz fs=192khz 128fs 22.5792mhz 24.576mhz 256fs 45.1584mhz 49.152mhz 192fs 33.8688mhz 36.864mhz table 8. master clock frequency example 2. dsd mode the external clocks, which are required to operate the AK4620B, are mclk and dclk. the master clock (mclk) should be synchronized with dsd clock (dclk) but the phase is not critical. the frequency of mclk is set by dcks bit. all external clocks (mclk, dclk) must be present whenever the AK4620B is in the normal operation mode (pdn pin = ?h?). if these clocks are not provided, the AK4620B may draw excess current because the device utilizes dynamically refreshed logic. the AK4620B should be reset by pdn pin = ?l? after these clocks are provided. if the external clocks are not present, the AK4620B should be in the power-down mode (pdn pin = ?l?). after exiting reset (pdn pin = ? ?) at power-up etc., the AK4620B is in the power-down mode until mclk is provided. ? audio serial interface format 1. pcm mode five serial modes are supported and selected by the dif2-0 bits in serial mode (two modes by dif pin in parallel mode) as shown in table 9 and table 10. in all modes the serial data has msb first, 2?s complement format. the sdto is clocked out on the falling edge of bick and the sdti is latched on the rising edge. mode2 can be used for 20 and 16 msb justified formats by zeroing the unused lsbs. mode dif2 dif1 dif0 sdto sdti lrck bick 0 0 0 0 24bit, msb justified 16bit, lsb justified h/l 48fs 1 0 0 1 24bit, msb justified 20bit, lsb justified h/l 48fs 2 0 1 0 24bit, msb justified 24bit, msb justified h/l 48fs default 3 0 1 1 24bit, i 2 s 24bit, i 2 s l/h 48fs 4 1 0 0 24bit, msb justified 24bit, lsb justified h/l 48fs table 9. audio data format (serial mode) mode dif pin sdto sdti lrck bick 2 l 24bit, msb justified 24bit, msb justified h/l 48fs 3 h 24bit, i 2 s 24bit, i 2 s l/h 48fs table 10. audio data format (parallel mode)
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 20 - lrck bick(64fs) sdto ( o ) 0 1 2 19 17 18 20 31 0 1 2 19 17 18 20 31 0 23 1 22 4 23 22 7 6 4 23 sdti(i) 1 14 0 12 11 1 14 0 12 11 sdto-19:msb, 0:lsb; sdti-15:msb, 0:lsb lch data rch data don?t care don?t care 7 6 21 5 3 13 15 30 21 3 3 5 3 15 13 2 2 figure 2. mode 0 timing lrck bick(64fs) sdto ( o ) 0 1 2 12 13 14 24 25 31 0 1 2 12 13 14 24 25 31 0 23 1 22 0 23 22 12 11 10 0 23 sdti(i) 1 18 0 19 8 7 1 18 0 19 8 7 sdto-23:msb, 0:lsb; sdti-19:msb, 0:lsb lch data rch data don?t care don?t care 12 11 10 figure 3. mode 1 timing lrck bick(64fs) sdto ( o ) 0 1 2 18 19 20 21 22 0 1 2 18 19 20 22 21 0 1 sdti(i) 23 24 25 23 24 25 23 22 4 23 22 5 4 5 4 1 22 0 23 3 2 1 22 0 23 3 2 23:msb, 0:lsb lch data rch data don?t care don?t care 5 5 4 1 0 32 10 3 2 23 figure 4. mode 2 timing lrck bick(64fs) sdto ( o ) 0 1 2 3 19 20 21 22 0 1 2 3 19 20 22 21 0 1 sdti(i) 23 24 25 23 24 25 23 22 4 23 22 5 4 5 4 1 22 0 23 3 2 1 22 0 23 3 2 23:msb, 0:lsb lch data rch data don?t care don?t care 5 5 4 1 0 32 10 3 2 figure 5. mode 3 timing
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 21 - lrck bick(64fs) sdto ( o ) 0 1 2 8 9 10 20 21 31 0 1 2 8 9 10 20 21 31 0 23 1 22 0 23 22 16 15 14 0 23 sdti(i) 1 22 0 23 12 11 1 22 0 23 12 11 23:msb, 0:lsb lch data rch data don?t care don?t care 16 15 14 figure 6. mode 4 timing
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 22 - 2. dsd mode in dsd mode, dif0-2 is ignored. the frequency of dclk is fi xed at 64fs. the dckb bit inverts 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 7. dsd mode timing ? d/a conversion mode switching timing rstda bit d/a data d/a mode 4/fs 0 pcm data dsd data pcm mode dsd mode figure 8. d/a mode switching timing (pcm to dsd) rstda bit d/a data d/a mode 4/fs dsd data pcm data dsd mode pcm mode figure 9. d/a mode switching mode timing (dsd to pcm) caution: in dsd mode, the signal level ranges from 25% to 75%. peak levels of dsd signal above this range are not recommended by the sacd format book (scarlet book).
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 23 - ? input volume the AK4620B includes two channel-independent analog volumes (ipga), each with 32 levels in 0.5db increments. these are located in front of the adc while digital volume controls (iatt) with 128 levels (including mute) are located after the adc. control of both of these volume settings is handled by the same register address. when the msb of the register is ?1?, the ipga changes and when the msb = ?0? the iatt changes. the ipga is an analog volume control that improves the s/n ratio compared with digital volume controls (table 11). level changes only occur during zero-crossings to minimi ze switching noise. channel independent zero-crossing detection is used. if there are no zero-crossings, then the level will change after a time-out. the time-out period scales with fs. the periods of 256/fs, 512/fs, 1024/fs and 2048/fs are selected by ztm1-0 bits in normal speed mode. if a new value is written to the ipga register before the ipga changes at the zero crossing or time-out, the previous value becomes invalid. the timer (channel independent) for time-out is reset and the timer restarts for the new ipga value. zcei bits in the control register enable zero-crossing detection. the iatt is a log volume that is linear-interpolated internally. when changing the level, the transition between att values has 29 levels and is done by soft changes, eliminating any switching noise. input gain setting 0db +6db +18db fs=44.1khz, a-weight 110db 108db 101db table 11. ipga+adc s/n (typ.) ztm1 ztm0 normal speed double speed quad speed 0 0 256/fs 512/fs 1024/fs 0 1 512/fs 1024/fs 2048/fs 1 0 1024/fs 2048/fs 4096/fs 1 1 2048/fs 4096/fs 8192/fs default table 12. lrck cycles for timeout period ? output volume the AK4620B includes channel independent digital output volumes (att) with 256 levels at linear steps including mute. these volumes are in front of the dac and can attenuate the input data from 0db to ? 48db and mute. when changing levels, transitions are executed via soft changes, eliminating any switching noise. the transition time of 1 level and all 256 levels is shown in table 13. transition time sampling speed 1 level 255 to 0 normal speed mode 4lrck 1020lrck double speed mode 8lrck 2040lrck quad speed mode 16lrck 4080lrck table 13. att transition time
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 24 - ? overflow detection the adc has a channel independent overflow detection function. this function is enabled in the parallel control mode, or when the zos bit = zoe bit = ?0?in serial control mode. ovfl/r pins go to ?h? if each lch/rch analog input overflows (exceeds -0.3dbfs). the output of each ovfl/r pin has sa me group delay as adc against analog input. ovfl/r pin is ?l? for 516/fs (=10.8ms @fs=48khz) after pdn pin = ? ?, and then overflow detection is enabled. ? zero detection the dac has a channel-independent zero detect function. the zero detect function is enabled when the zos bit = ?1? and the zoe bit = ?0?in serial control mode. when the input data at both channels is continuously zero for 8192 lrck cycles, the dzf pin of each channel goes to ?h?. the dzf pin of each channel immediately goes to ?l? if the input data of each channel is not zero after dzf ?h?. if the rstda bit is ?0?, the dzf pins of both channels go to ?h?. dzf pins of both channels go to ?l? at 4~5/fs after the rstda bit becomes ?1?. zero detect function can be disabled by the zoe bit. in this case, the dzf pins of both channels are always ?l?. the dzfb bit can invert the polarity of the dzf pin. ? digital high pass filter the adc has a digital high pass filter for dc offset can cellation. the cut-off frequency of the hpf is 0.9hz at fs=44.1khz. the digital high pass filter cutoff frequency scales with the sampling rate (fs). in parallel mode, the hpf is always enabled. in serial mode, the hpf can control each channel by hpln/hprn bits. ? de-emphasis filter the dac includes a digital de-emphasis filter (tc=50/15 s) via an integrated iir filter. this filter corresponds to three frequencies (32khz, 44.1khz, 48khz). this setting is done via control register (dem1-0 bits). this filter is always off in double and quad speed modes. the dem0 pin and dem0 bit are or?d in serial control mode. in parallel control mode, the dem1 bit is fixed to ?0? and only the dem0 pin can be controlled (44.1khz or off). when in dsd mode, dem1-0 bits are ignored. the setting value is held even if pcm mode and dsd mode are switched. no dem1 dem0 mode 0 0 0 44.1khz 1 0 1 off 2 1 0 48khz 3 1 1 32khz default table 14. de-emphasis control (normal speed mode)
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 25 - ? adc single-ended/differential input mode the adc has a selectable single-ended or differential input mode. this mode can be selected by admode pin, aml bit and amr bit. (see table 15 and table 16) in differential input mode, the ipga is powered-down and bypassed. iatt can be controlled in differential mode. admode pin lch rch l single-ended single-ended h differential differential table 15. adc input mode in parallel mode admode pin aml bit amr bit lch rch 0 0 single-ended single-ended 0 1 single-ended differential 1 0 differential single-ended l 1 1 differential differential h x x differential differential table 16. adc input mode in serial mode (x: don?t care) ? soft mute operation soft mute operation is performed in the digital domain of the dac input. when the smute bit goes to ?1?, the output signal is attenuated by ? during att_data att transition time (table 12) from the current att level. when 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 soft mute is cancelled before attenuating to ? after starting the operation, the attenuation is discontinued and returns to att level by the same cycle. the soft mute is effective for changing the signal source without stopping the signal transmission. 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 (table 12). for example, this time is 1020lrck cycles (1020/fs) at att_data=255 in normal speed mode. (2) analog output corresponding to 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 at each channel is continuously zero for 8192 lrck cycles, dzf pin of each channel goes to ?h?. dzf pin immediately goes to ?l? if input data are not zero after going dzf pin ?h?. figure 10. soft mute and zero detection
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 26 - ? power down & reset the adc and dac of AK4620B are placed in power-down mode by bringing the pdn pin = ?l?. each digital filter is also reset at the same time. the internal register values are initialized by bringing pdn pin to ?l?. this reset should always be done after power-up. as both control registers of the adc and the dac go to the reset state (rstad bit = rstda bit = ?0?), each register should be cleared after performing the reset. in the case of the adc, an analog initialization cycle starts after exiting the power-down or reset state. the output data (sdto) is available after 516 cycles of lrck clock. this initialization cycle does not affect the dac operation. power down mode can be also controlled by the registers (pwad bit, pwda bit). po w er s u p p l y rsta d( r egis ter ) rstda(register ) pwad(register) pwda(register) pwvr(register) a dc internal state ia tt sdto oa tt a ou t dac internal state external mute ex a mp le external clocks the clocks can be stopped . pd reset inita normal pd inita normal 00h 00h xxh xxh 00h 00h xxh xxh ?0? ?0? fi output fi output pd res et pd nor mal nor mal ffh ( 1) ffh xxh xxh xxh(2 ) xxh yyh yyh vcom hi-z fa de output fa de mclk, lrck, bick pdn pin ** * * ffh hi- z ? inita: initializing period of adc analog section (516/fs). ? pd: power down state. the contents of all registers are held. ? xxh, yyh: the current value in att registers. ? fi: fade in. after exiting power down and reset state, att value fades in. ? fade: after exiting power down and reset state, att value fades in/out. (1) when rstda is ?l? and oatt value is written to ?xxh?, oatt value changes from ffh to xxh according to fade operation. (2) when pwda is ?l? and oatt value is written to ?yyh?, oatt value changes from xxh to yyh according to fade operation. ? aout: some pop noise may occur at ?*?. figure 11. reset & power down sequence in serial mode
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 27 - in parallel mode, both adc and dac are powered up with releasing internal reset state when pdn pin is set to ?h?. when pdn pin is ?l?, iatt is set to ?00h (mute)?. after exiting power down mode, iatts fade in to ?80h (0db)?. at that time, adc s output ?0? during first 516/fs cycles. dac does not have the initialization cycle and the operation of fade-in. power supply a dc internal state sdto a out dac internal state external mute example external clocks the clocks can be stopped. pd inita normal pd inita normal ?0? ?0? output output pd pd normal normal hi-z hi-z output mclk, lrck, bick pdn pin * mclk, lrck, bick output * * iatt 00h 00h ? 80h 80h 00h 00h ? 80h 80h fi fi ? inita: initializing period of adc analog section (516/fs). ? pd: power down state. ? fi: fade in. after exiting power down and reset state, att value fades in. ? aout: some pop noise may occur at ?*?. figure 12. reset & power down sequence in parallel mode
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 28 - ? serial control interface the internal registers may be written to the 3-wire p interface pins: csn, cclk, cdti. the data on this interface consists of chip address (2bits, c0/1) read/write (1 bit), regi ster address (msb first, 5 bits ) and control data (msb first, 8 bits). address and data is clocked in on the rising edge of cclk. data is latched out after the 16th rising edge of cclk, following a high-to-low transition of csn. operation of the control serial port may be completely asynchronous with the audio sample rate. the maximum clock speed of the cclk is 5mhz. the chip address is fixed to ?10?. the access to the chip address except for ?10? is invalid. pdn pin = ?l? resets the registers to their default values. function parallel mode serial mode adc single-ended/differential input mode x x overflow detection x x zero detection - x soft mute - x input volume - x output volume - x hpf off - x dsd mode - x 16/20/24 bit lsb justified format of dac - x mclk = 256fs @ quad speed - x de-emphasis: 32khz, 48khz - x table 17. function list (x: available, -: not available) csn cclk 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 cdti c1 c0 a 2 a 3 a 1 a 0 a 4 d7d6d5d4d3d2d1d0 r/w c1-c0: chip a ddress (fixed to ?10?) r/w: read/write (fixed to ?1?:write) a 4-a0: register address d7-d0: cont rol data figure 13. control i/f timing * read command is not supported. * the control data can not be written when the cclk rising edge is 15times or less or 17times or more during csn is ?l?.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 29 - ? register map addr register name d7 d6 d5 d4 d3 d2 d1 d0 00h power down control slow dzfb zoe zos 0 pwvr pwad pwda 01h reset control d/p dcks dckb 0 aml amr rstad rstda 02h clock and format control dif2 dif1 dif0 cmode cks1 cks0 dfs1 dfs0 03h deem and volume control smute hprn hpln zcei ztm1 ztm0 dem1 dem0 04h lch ipga control ipgl7 ipgl6 ipgl5 ipgl4 ipgl3 ipgl2 ipgl1 ipgl0 05h rch ipga control ipgr7 ipgr6 ipgr5 ipgr4 ipgr3 ipgr2 ipgr1 ipgr0 06h lch att control attl7 attl6 attl5 attl4 attl3 attl2 attl1 attl0 07h rch att control attr7 attr6 attr5 attr4 attr3 attr2 attr1 attr0 note: data should not be written to addresses 08h through 1fh. pdn pin = ?l? resets the registers to their default values. ? control register setup sequence when the pdn pin goes ?l? to ?h? upon power-up etc., the AK4620B will be ready for normal operation by the next sequence. in this case, all control registers are set to default values and the AK4620B is in the reset state. (1) set the clock mode and the audio data interface mode. (2) cancel the reset state by setting rstad bit or rstda bit to ?1?. refer to reset contorl register (01h). (3) adc output and dac output should be muted externally until canceling each reset state. the clock mode should be changed after setting rstad bit and rstda bit to ?0?. at that time, adc outputs and dac outputs should be muted externally.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 30 - ? register definitions addr register name d7 d6 d5 d4 d3 d2 d1 d0 00h power down control slow dzfb zoe zos 0 pwvr pwad pwda default 0 0 0 0 0 1 1 1 pwda: dac power down 0: power down 1: power up (default) ?0? powers down only the dac section and then the aouts go to hi-z immediately. the contents of all registers are not initialized and enabled to write to the registers. after exiting power down mode, the oatts fade in/out the setting value of the control register (06h & 07h). the analog output should be muted externally as some pop noise may occur when entering and exiti ng this mode. pwad: adc power down 0: power down 1: power up (default) ?0? powers down only the adc and then the sdto goes ?l? immediately. the ipgas also go ?00h?, but the contents of all registers are not initialized and enabled to write to the registers. after exiting power down mode, the ipgas fade in the setting value of the control register (04h & 05h). at that time, the adcs output ?0? during first 516 lrck cycles. pwvr: vref power down 0: power down 1: power up (default) ?0? powers all sections down and then both adc and dac do not operate. the contents of all register values are not initialized and enabled to write to the registers. when pwad and pwda bits go to ?0? and pwvr bit goes to ?1?, only the vref section can be powered up. zos: zero-detection/ overflow-detection control for #15 and 16 pins. 0: overflow detection for adc input (default) 1: zero detection for dac input. zoe: zero-detection / overflow-detection disable 0: enable (default) 1: disable. outputs ?l?. dzfb: inverting enable of dzf 0: dzf goes ?h? at zero detection (default) 1: dzf goes ?l? at zero detection slow: dac slow roll-off filter enable 0: sharp roll-off filter (default) 1: slow roll-off filter
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 31 - addr register name d7 d6 d5 d4 d3 d2 d1 d0 01h reset control d/p dcks dckb 0 aml amr rstad rstda default 0 0 0 0 0 0 0 0 rstda: dac reset 0: reset (default) 1: normal operation ?0? resets the internal timing and the aouts go to vcom voltage immediately. the contents of all registers are not initialized and enabled to write to the registers. after exiting the power down mode, the oatts fade in the setting values of the control register (06h & 07h). the analog outputs should be muted externally since pop noise may occur when entering to and exiting from this mode. rstad: adc reset 0: reset (default) 1: normal operation ?0? resets the internal timing and then sdto goes to ?l? immediately. the ipgas also go ?00h?, but the contents of all registers are not initialized and enabled to write to the register. after exiting the power down mode, the ipgas fade in the setting value of the control register (04h & 05h). at that time, the adcs output ?0? during first 516 lrck cycles. aml, amr: default ?0? (see table 16 ) dckb: polarity of dclk (dsd only) 0: dsd data is available upon dclk falling edge. (default) 1: dsd data is available upon dclk rising edge. dcks: master clock frequency select at dsd mode (dsd only) 0: 512fs (default) 1: 768fs d/p: dsd/pcm mode select 0: pcm mode (default) 1: dsd mode addr register name d7 d6 d5 d4 d3 d2 d1 d0 02h clock and format control dif2 dif1 dif0 cmode cks1 cks0 dfs1 dfs0 default 0 1 0 0 0 0 0 0 dfs1-0: sampling speed control (see table 2) default: normal speed cmode, cks1-0: master clock frequency select (see table 3) default: 256fs dif2-0: audio data interface modes (see table 9) 000: mode 0 001: mode 1 010: mode 2 (default) 011: mode 3 100: mode 4 default: 24bit msb justified for both adc and dac
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 32 - addr register name d7 d6 d5 d4 d3 d2 d1 d0 03h deem and volume control smute hprn hpln zcei ztm1 ztm0 dem1 dem0 default 0 0 0 1 1 0 0 1 dem1-0: de-emphasis response (see table 3) 00: 44.1khz 01: off (default) 10: 48khz 11: 32khz ztm1-0: zero-crossing timeout period select (see table 11) default: 1024fs zcei: adc ipga zero crossing enable 0: input pga gain changes occur immediately 1: input pga gain changes occur only on zero-crossing or after timeout. (default) hpln/rn: left/right channel digital high pass filter disable 0: enable (default) 1: disable smute: dac input soft mute control 0: normal operation (default) 1: dac outputs soft-muted the soft mute is independent of the output att and performed digitally.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 33 - addr register name d7 d6 d5 d4 d3 d2 d1 d0 04h lch ipga control ipgl7 ipgl6 ipgl5 ipgl4 ipgl3 ipgl2 ipgl1 ipgl0 05h rch ipga control ipgr7 ipgr6 ipgr5 ipgr4 ipgr3 ipgr2 ipgr1 ipgr0 default 1 0 0 0 0 0 0 0 ipgl/r7-0: adc input gain level refer to table 10 default: 80h (0db) the AK4620B includes two channel-independent analog volumes (ipga), each with 32 levels in 0.5db increments. these are located in front of the adc while digital volume controls (iatt) with 128 levels (including mute) are located after the adc. control of both of these volume settings is handled by the same register address (04h for l-ch, 05h for r-ch). when the msb of the register is ?1?, the ipga changes and when the msb= ?0? the iatt changes. 80h is the crossover point of the ipga and datt, and both ipga/iatt are set to 0db. the ipgas are set to ?00h? when the pdn pin goes ?l?. after returning to ?h?, the ipgas fade in the default value, ?80h? by 531(1/fs) cycles. the ipgas are set to ?00h? when pwad goes ?0?. after returning to ?1?, the ipgas fade in the current value, but the adc output is ?0? during the fi rst 516(1/fs) cycles. the ipags are set to ?00h? when rstad goes ?0?. after returning to ?1?, the ipgas fade in to the current value, but the adc outputs ?0? during the first 516(1/fs) cycles. iatts can be controlled in differential mode. data analog volume (db) digital att (db) total gain (db) step width (db) ffh ~ a5h +18 0 +18 - a4h +18 0 +18 - a3h +17.5 0 +17.5 0.5 : : : : : 82h +1.0 0 +1.0 0.5 81h +0.5 0 +0.5 0.5 80h 0 0 0 0.5 ipga analog volume with 0.5db/step 7fh 0 -0.5 -0.5 0.5 7eh 0 -1.0 -1.0 0.5 : : : : : 02h 0 -63.0 -63.0 0.5 01h 0 -63.5 -63.5 0.5 00h 0 mute mute iatt digital volume with 0.5db/step. soft-changes between each level. table 10. ipga code table addr register name d7 d6 d5 d4 d3 d2 d1 d0 06h lch oatt control attl7 attl6 attl5 attl4 attl3 attl2 attl1 attl0 07h rch oatt control attr7 attr6 attr5 attr4 attr3 attr2 attr1 attr0 default 1 1 1 1 1 1 1 1 att7-0: attenuation level att = 20 log 10 (att_data / 255) [db] ffh : 0db (default) 00h : mute
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 34 - system design figure 14 & figure 15 shows the system connection diagram. an evaluation board (akd4620b) is available, which demonstrates application circuits, the optimum layout, power supply arrangements and measurement results. + 4.75 5.25v a nalog supply 10u 10u 0.1u 0.1u 0.1u 0.1u rch out lch out 3.0 5.25v digital supply mode setting/ up audio dsp rch lpf lch lpf vcom a inr+ vref a gnd va p/s mclk lrck bick sdto sdti cdti/cks0 cclk/cks1 csn/dif dfs0 admode vt vd dgnd aoutl- aoutl+ aoutr- aoutr+ pdn dem0 1 2 3 5 6 7 8 9 11 12 13 14 17 18 19 20 21 22 23 26 27 28 29 30 a k4620b + 10 24 25 4 a inr- a inl+ a inl- rch input buffer lch input buffer ovfr/dzfr ovfl/dzfl 15 16 3.0 3.6v digital supply 33p 33p 330 330 notes: - agnd and dgnd must be connected to the same analog ground plane. - when aout+/- drives some capacitive load, some resistance should be added in series between aout+/- and capacitive load. - all digital input pins must not be left floating. - when ovfr/dzfr pin and ovfl/dzfl pin are used, a 330 ? resistor and a 33pf capacitor should be added to ovfr/dzfr pin and ovfl/dzfl pin to avoid the coupling from sdto pin. figure 14. typical connection diagram (differential mode)
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 35 - 4.75 5.25v a nalog supply + 10u 10u 0.1u 0.1u 0.1u 0.1u rch out lch out 3.0 5.25v digital supply mode setting/ up audio dsp rch lpf lch lpf vcom a inr+ vref a gnd va p/s mclk lrck bick sdto sdti cdti/cks0 cclk/cks1 csn/dif dfs0 admode vt vd dgnd aoutl- aoutl+ aoutr- aoutr+ pdn dem0 1 2 3 5 6 7 8 9 11 12 13 14 17 18 19 20 21 22 23 26 27 28 29 30 a k4620b + 10 24 25 4 nc a inl+ nc ovfr/dzfr ovfl/dzfl 15 16 3.0 3.6v digital supply 33p 33p 330 330 notes: - agnd and dgnd must be connected to the same analog ground plane. - when aout+/- drives some capacitive load, some resistor should be added in series between aout+/- and capacitive load. - all digital input pins must not be left floating. - when ovfr/dzfr pin and ovfl/dzfl pin are used, a 330 ? resistor and a 33pf capacitor should be added to ovfr/dzfr pin and ovfl/dzfl pin to avoid the coupling from sdto pin. figure 15. typical connection diagram (single-ended mode)
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 36 - 1 analog ground digital ground system controller 2 3 4 5 6 7 8 9 10 11 12 30 29 28 27 26 25 24 23 22 21 20 19 13 14 18 17 vcom a inr+ a inr-/nc a inl+ a inl-/nc vref a gnd va p/s mclk lrck bick aoutr+ aoutr- aoutl+ aoutl- dgnd vd vt admode dem0 pdn dfs0 csn/dif AK4620B sdto sdti cclk/cks1 cdti/cks0 15 16 ovfr/dzfr ovfl/dzfl figure 16. ground layout 1. grounding and power supply decoupling the AK4620B requires careful attention to power supply and grounding layout. to minimize coupling from digital noise, decoupling capacitors should be connected to va, vd and vt respectively. va is supplied from the analog supply in the system, and vd and vt are supplied from the digital supply in the system. power lines of va, vd and vt should be distributed separately from the point with low impedance of regulator etc. the power up sequence is not critical among va, vd and vt. agnd and dgnd must be connect ed to one analog ground plane. decoupling capacitors should be as near to the AK4620B as possible, with the small value ceramic capacitor being the nearest. 2. voltage reference the differential voltage between vref and agnd sets the analog input/output range. vref pin is normally connected to va with a 0.1 f ceramic capacitor. vcom is the signal ground of this chip. a 10 f electrolytic capacitor in parallel with a 0.1 f ceramic capacitor attached to vcom pin eliminates the effects of high frequency noise. no load current may be drawn from vcom pin. all signals, especially clocks, should be kept away from the vref and vcom pins in order to avoid unwanted coupling into the AK4620B. 3. adc output the adc output data format is 2?s complement. the dc offset, including the adc?s own dc offset, is removed by the internal hpf. the AK4620B samples the analog inputs at 128fs. the digital filter rejects noise above the stopband except for multiples of 128fs.
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 37 - 4. analog inputs 4-1. single-ende d input (admode pin = ?l?) the ipga inputs are single-ended. the input resistance of ipga is typically 5.1k ? at ipga=0db and typically 1.18k ? at ipga=+18db. the input signal is typically ac coupled through a capacitor. the cut-off frequency is fc = (1/2 rc). the input signal range scales with the vref voltage and is nominally 3.07vpp (vref=5v) centered around the internal common voltage (about va/2). in single-ended mode, the AK4620B includes an anti-aliasing filter (rc filter) to attenuate noise around 128fs. 4-2. full-differential i nput (admode pin = ?h?) the AK4620B can accept input voltages from agnd to va. the input signal range scales with the vref voltage and is nominally 2.82vpp (vref = 5v), centered around the internal common voltage (about va/2). figure 17 shows an input buffer circuit example. this is a fully differential input buffer circuit with an inverted amplifier (gain: ? 10db). the capacitor of 10nf between ainl+/ ? (ainr+/ ? ) decreases the clock feedthrough noise of the modulator, and composes a 1st order lpf (fc=360khz) with a 22 ? resistor before the capacitor. this circuit also has a 1st order lpf (fc=370khz) composed of op-amp. the evaluation board should be referred about the detail. ain+ ain- AK4620B analog in 4.7k 4.7k vp+ vp- njm5532 47 3k 470p 910 22 47 3k 470p 910 22 bias 10n 9.3vpp 2.82vpp 2.82vpp bias 10 0.1 bias 10k 10k va va = 5v vp+ = 15v vp- = -15v figure 17. input buffer example in differential mode
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 38 - 5. analog outputs the analog outputs are fully differential and 2.8vpp (typ. vref = 5v), centered around vcom. the differential outputs are summed externally: vout = (aout+)-(aout-) between aout+ and aout-. if the summing gain is 1, the output range is 5.6vpp (typ. vref = 5v). the bias voltage of the external summing circuit is supplied externally. the input data format is 2?s complement. the output voltage is a positive full scale for 7fffffh(@24bit) and a negative full scale for 800000h(@24bit). the ideal aout is 0v for 000000h(@24bit). the internal switched-capacitor filter and the external lpf attenuate the noise generated by the delta-sigma modulator beyond the audio passband. figure 18 shows an example of external lpf circuit summing the differential outputs by an op-amp. figure 19 shows an example of differential outputs and lpf circuit example by three op-amps. 4.7k 4.7k 200 4.7k 200 4.7k 330p +vop 330p -vop aout- aout+ 2.2n analog out AK4620B figure 18. external lpf circuit example 1 for pcm (fc = 136khz, q=0.694) frequency response gain 20khz ? 0.01db 40khz ? 0.06db 80khz ? 0.59db table 18. filter response of external lpf circuit example 1 for pcm
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 39 - 330 100u 180 aoutl- 10k 3.9n 1.2k 680 3.3n 6 4 3 2 7 10u 0.1u 0.1u 10u 10u njm5534d 330 100u 180 aoutl+ 10k 3.9n 1.2k 680 3.3n 6 4 3 2 7 10u 0.1u 0.1u 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 19. 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 19. filter response of external lpf circuit example 2 for pcm
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 40 - it is recommended by sacd format book (scarlet book) that the filter response at sacd playback is an analog low pass filter with a cut-off frequency of maximum 50khz and a slope of minimum 30db/oct. the AK4620B can achieve this filter response by combination of the internal filter (table 20) and an external filter (figure 20). frequency gain 20khz ? 0.4db 50khz ? 2.8db 100khz ? 15.5db table 20. 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 20. external 3rd order lpf circuit example for dsd frequency gain 20khz ? 0.05db 50khz ? 0.51db 100khz ? 16.8db dc gain = 1.07db table 21. 3rd order lpf (figure 20) response
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 41 - package detail a note: dimension "*" does not include mold flash. 0.22 0.1 0.65 *9.7 0.1 1.5max a 1 15 16 30 30pin vsop (unit: mm) 5.6 0.1 7.6 0.2 0.45 0.2 -0.05 +0.10 0.3 0.15 0.12 m 0.08 1.2 0.10 0.10 +0.10 -0.05 ? material & lead finish package molding compound: epoxy lead frame material: cu lead frame surface treatment: solder (pb free) plate
asahi kasei [AK4620B] ms0401-e-00 2005/07 - 42 - marking akm a k4620bvf xxxbyyyyc xxxbyyyyc date code identifier xxxb : lot number (x : digit number, b : alpha character) yyyyc : assembly date (y : digit number, c : alpha character) revision history date (yy/mm/dd) revision reason page contents 05/07/08 00 first edition important notice ? these products and their specifications are subject to change without notice. before considering any use or application, consult the asahi kasei microsystems co., ltd. (akm) sales office or authorized distributor concerning their current status. ? akm assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. ? 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. ? akm products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and akm assumes no responsibility relating to any such use, except with the express written consent of the representative director of akm. as used here: a. 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. b. 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. ? it is the responsibility of the buyer or distributor of an akm product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and 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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