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asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 1 - general description the AK4367 is 24bit dac with built - in headphone amplifier. the AK4367 features an analog mixing circuit that allows easy interfacing in mobile phone and portable communication designs. the integrated headphon e amplifier features ? click - free ? power - on/off, a mute control and delivers 50mw of power at 16 w . the ak4365 is housed in a 20pin qfn package, making it suitable for portable applications. feature o multi - bit d s dac o sampling rate : 8khz ~ 48khz o 64x over s ampling o on chip perfect filtering 8 times fir interpolator - passband : 20khz - passband ripple: 0.02db - stopband attenuation : 54db o digital de - emphasis filter : 32khz, 44.1khz and 48khz o system clock: 256fs/384fs/512fs - input level: cmos or 0.4vpp a nalog input o audio i/f format : msb first, 2 ? s compliment - i 2 s, 24bit msb justified, 24bit/20bit/ 16bit lsb justified o digital att o analog mixing circuit o mon o lineout o p interface : 3 - wire /i 2 c o bass boost function o headphone amplifier - output power : 50mw x 2ch @16 w , 3.3v - s/n: 92db@2.4v - click noise free at power - on/off and mute o power supply: 2.2v ~ 3.6v o power supply current: 2.8ma@2.4v (@ hp - amp no - input ) o ta: - 40 ~ 85 c o small package: 20pin qfn AK4367 = preliminary = low power 24 - bit 2ch dac with hp - amp & output mixer
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 2 - audio interface hdp a mp s erial i/f hpl hpr vss vdd i2c mout rin min s data lrck cad0/csn bi ck scl/cclk sda/cdti h vdd mutet v com dac dac l in (lch) (rch) vcom clock divider mclk att & bass boost dem & digital filter hdp a mp mute mute pdn figure 1 . AK4367 block diagram
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 3 - n ordering guide AK4367vn - 40 ~ +85 c 20pin qfn (0.5mm pitch) akd4367 evaluation board for AK4367 n pin layout sda/cdti lin 1 scl/cclk 20 2 cad0/csn 3 sdata 4 lrck 5 rin 19 min 18 17 16 bick 6 mclk 7 pdn 8 i2c 9 mout 10 15 14 13 12 11 hvdd vss vdd mutet vcom top view hpl hpr
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 4 - pin/function no. pin name i/o function sda i /o control data input/output pin (i2c = ? h ? ) 1 cdti i control data input pin (i2c = ? l ? ) scl i control data clock pin (i2c = ? h ? ) 2 cclk i control data clock pin (i2c = ? l ? ) cad0 i chip address 0 select pin (i2c= ? h ? ) 3 csn i control data chip select pin (i2c= ? l ? ) 4 sdata i audio serial data input pin 5 lrck i l/r clock pin this clock determines which audio channel is currently being input on sdata pin. 6 bick i serial bit clock pin this clock is used to latch audio data. 7 mclk i master clock in put pin 8 pdn i power - down & reset pin when at ? l ? , the AK4367 is in power - down mode and is held in reset. the AK4367 should always be reset upon power - up. 9 i2c i control mode select pin (internal pull - down pin) ? h ? : i 2 c bus, ? l ? : 3 - wire serial 10 mout o mono analog output pin 11 vcom o common voltage output pin normally connected to vss pin with 0.1 m f ceramic capacitor in parallel with a 2.2 m f electrolytic capacitor. 12 mutet o mute time constant control pin connected to vss pin with a capacitor for mute time constant. 13 vdd - power supply pin 14 vss - ground pin 15 hvdd - power supply pin for headphone amp 16 hpr o rch headphone amp output pin 17 hpl o lch headphone amp output pin 18 min i mon o analog input pin 19 rin i rch analog input pin 20 lin i lch analog input pin note: all digital input pins except internal pull - down pin must not be left floating.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 5 - absoluate maximum rating (vss =0v ; note 1 ) parameter symbol min max units analog, digital vdd - 0.3 4.6 v power supplies hp - amp hvdd - 0.3 4.6 v input current (any pins except for supplies) iin - 10 ma input voltage vin - 0.3 vdd +0.3 or 4.6 v ambient temperature ta - 4 0 85 c storage temperature tstg - 65 150 c note 1 . all voltages with respect to ground. warning: operation at or beyond these limits may result in permanent damage to the device. normal operation is not guaranteed at these extremes. recommend operating conditions (vss= 0v ; note 1 ) parameter symbol min typ max units analog, digital vdd 2.2 2.4 3.6 v power supplies ( note 2 ) hp - amp hvdd 2.2 2.4 3.6 v note 1 . all voltages with respect to ground. note 2 . vdd should be sa me voltage as hvdd. * akm assumes no responsibility for usage beyond the conditions in this datasheet.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 6 - analog characteristics (t a=25 c ; vdd=hvdd=2.4v, vss=0v; fs=4 4.1k hz ; boost off; signal frequency =1khz ; measurement band width=10hz ~ 20khz; headphone - amp: load impedance is a serial connection with r l =16 w and c l =220 m f. (refer to figure 32 ); mono output: r l =16 w ; unless otherwise specified) parameter min typ max units dac resolution - - 24 bit linein: (lin/rin/min pins) an alog input characteristics input resistance tbd 40 tbd k w gain lin/rin ? mout tbd - 6 tbd db min ? mout tbd 0 tbd db lin/min ? hpl, rin/min ? hpr tbd +1.8 tbd db headphone - amp: (hpl/hpr pins) ( note 3 ) analog output charact eristics thd+n ( - 3dbfs output, po=15mw@16 w , 2.4v) - - 58 tbd db ( - 3dbfs output, po=28mw@16 w , 3.3v) - - 58 - db d - range ( - 60dbfs output, a - weighted, 2.4v) tbd 92 - db ( - 60dbfs output, a - weighted, 3.3v) - 94 - db s/n (a - weighted, 2.4v) tbd 92 - db (a - weighted, 3.3v) - 94 - db interchannel isolation tbd 80 - db dc accuracy interchannel gain mismatch - 0.2 tbd db gain drift - 200 - ppm/ c load resistance ( note 4 ) 16 - - w load capacitance - - 300 output volta ge ( - 3dbfs output) ( note 5 ) tbd 1.39 tbd vpp max output power (r l =16 w , 2.4v) - 26 - mw (r l =16 w , 3.3v) - 50 - mw mon o output: (mout pin) ( note 6 ) analog output characteristics: thd+ n (0dbfs output) - - 60 tbd db s/n (a - weighted) tbd 92 - db dc accuracy gain drift - 200 - ppm/ c load resistance ( note 4 ) 10 - - k w load capacitance - - 25 pf output voltage ( note 7 ) tbd 1.58 tbd vpp output volume: (mout pin) step size tbd 2 tbd db gain control range - 30 - 0 db note 3 . dacl=dacr= ? 1 ? , minl=minr=linl=rinr= ? 0 ? , attl=attr=0db. note 4 . ac load note 5 . outp ut voltage is proportional to vdd voltage. vout = 0.58 x vdd(typ)@ - 3dbfs . note 6 . dacm= ? 1 ? , dacl=dacr= ? 0 ? , linm=rinm=minm= ? 0 ? , attl=attr=attm=0db, and common mode signal is input to l/rch of dac. note 7 . out put voltage is proportional to vdd voltage. vout = 0.66 x vdd(typ).
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 7 - power supplies power supply current normal operation (pdn= ? h ? ) ( note 8 ) vdd - 1.8 tbd ma hvdd - 1.0 tbd ma power - down mode (pdn= ? l ? ) ( note 9 ) - 1 tbd m a note 8 . pmdac=pmhpl=pmhpr=pmmo= ? 1 ? , muten= ? 1 ? and hp - amp output is off. note 9 . all digital input pins including clock pins (mclk, bick and lrck) are held at vdd or vss. pdn pin is held at vss.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 8 - filter characteristics ( ta= 25 c ; vdd, hvdd=2.2 ~ 3.6v; fs=4 4.1k hz ; de - emphasis = ? off ? ) parameter symbol min typ max units dac digital filter: ( note 10 ) passband - 0.05db ( note 11 ) pb 0 - 20.0 khz - 6.0db - 22.05 - khz stopband ( note 11 ) sb 24.1 - - khz passband ripple pr - - 0.02 db stopband attenuation sa 54 - - db group delay ( note 12 ) gd - 20.8 - 1/fs gr oup delay distortion d gd - 0 - s dac digital filter + analog filter: ( note 10 ) ( note 13 ) frequency response 0 ~ 20.0khz fr - 0.5 - db analog filter: ( note 14 ) frequency resp onse 0 ~ 20.0khz fr - 1.0 - db boost filter: ( note 13 ) ( note 15 ) 20hz fr - 5.76 - db 100hz - 2.92 - db min 1khz - 0.02 - db 20hz fr - 10.80 - db 100hz - 6.84 - db mid 1khz - 0.13 - db 20hz fr - 16.06 - db 100hz - 10.54 - db frequency response max 1khz - 0.37 - db note 10 . boost off (bst1 - 0 = ? 00 ? ) note 11 . the passband and stopband frequencies scale with fs. for example, p b=0.4535*fs(@ 0.05db), sb=0.546*fs(@ - 54db). note 12 . this is the calculated delay time caused by digital filtering. this time is measured from the setting of the 24bit data of both channels to the input registers to the output of the analog signal. note 13 . dac hpl, hpr, mout note 14 . min hpl/hpr/mout, lin hpl/mout, rin hpr/mout note 15 . these frequency responses scale with fs. if high - level signal is input, the AK4367 clips at low frequency. boost filter (fs=44.1khz) -5 0 5 10 15 20 10 100 1000 10000 frequency [hz] level [db] max mid min figure 2 . boost frequency (fs=44.1khz)
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 9 - dc characteristics ( ta= 25 c ; vdd, hvdd=2.2 ~ 3.6 v ) parameter symbol min typ max units h igh - l evel i nput voltage vih 70 % dvdd - - v low - l evel input voltage vil - - 30 % dvdd v input voltage at ac coupling ( note 16 ) vac 0.4 - - vpp low - l evel output voltage (iout = 3ma) vol - - 0.4 v input leakage current ( note 17 ) iin - - 10 m a note 16 . only mclk pin. ( figure 32 ) note 17 . i2c pin has internal pull - down device, nominally 100k w . switching characteristics ( ta= 25 c ; vdd, hvdd = 2.2 ~ 3.6 v ; c l = 20pf ) parameter symbol min t yp max units master clock timing frequency fclk 2.048 - 24.576 mhz pulse width low ( note 18 ) tclkl 0.4/fclk - - ns pulse width high ( note 18 ) tclkh 0.4/fclk - - ns ac pulse width ( note 21 ) tacw 20 - - ns lrck timing frequency fs 8 44.1 48 khz duty cycle: duty 45 - 55 % serial interface timing ( note 19 ) bick period tbck 1/(64fs) - - ns bick pulse width low tbckl 130 - - ns pulse width high tbckh 130 - - ns lrck edge to bick ? - ? ( note 20 ) tlrb 50 - - ns bick ? - ? to lrck edge ( note 20 ) tblr 50 - - ns sdata hold time tsdh 50 - - ns sdata setup time tsds 50 - - ns control interface timing (3 - wire serial mode) cclk period tcck 200 - - ns cclk pulse width low tcckl 80 - - ns pulse width high tcckh 80 - - ns cdti setup time tcds 40 - - ns cdti hold time tcdh 40 - - ns csn ? h ? time tcsw 150 - - ns csn ? - ? to cclk ? - ? tcss 50 - - ns cclk ? - ? to cs ? - ? tcsh 50 - - ns note 18 . except ac coupling. note 19 . refer to ? serial data interface ? . note 20 . bic k rising edge must not occur at the same time as lrck edge. note 21 . pulse width to ground level when mclk is connected to a capacitor in series and a resistor is connected to ground. (refer to figure 3 .)
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 10 - parameter symbol min t yp max units control interface timing (i 2 c bus mode): ( note 22 ) scl clock frequency fscl - - 100 khz bus free time between transmissions tbuf 4.7 - - m s start condition hold time ( prior to first clock pulse) thd:sta 4.0 - - m s clock low time tlow 4.7 - - m s clock high time thigh 4.0 - - m s setup time for repeated start condition tsu:sta 4.7 - - m s sda hold time from scl falling ( note 23 ) thd:dat - - m s sda setup time from scl rising tsu:dat 0.25 - - m s rise time of both sda and scl lines tr - - 1.0 m s fall time of both sda and scl lines tf - - 0.3 m s setup time for stop condition tsu:sto 4.0 - - m s pulse width of spike noise suppressed by in put filter tsp 0 - 50 ns power - down & reset timing pdn pulse width ( note 24 ) tpd 150 - - n s note 22 . i 2 c is a registered trademark of philips semiconductors. note 23 . data mus t be held long enough to bridge the 300ns - transition time of scl. note 24 . the AK4367 can be reset by bringing pdn= ? l ? to ? h ? only upon power up. purchase of asahi kasei microsystems co., ltd i 2 c components conveys a license unde r the philips i 2 c patent to use the components in the i 2 c system, provided the system conform to the i 2 c specifications defined by philips.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 11 - n timing diagram mclk input measurement point vss tacw t acw vss 1/fclk 1000pf 100k w vac figure 3 . mclk ac coupling timing 1/fclk tclkl vih tclkh mclk vil 1/fs vih lrck vil tbck tbckl vih tbckh bick vil figure 4 . clock timing tlrb lrck vih bick vil tsds vih sdata vil tsdh vih vil tblr figure 5 . serial interface timing
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 12 - tcss csn vih cclk vil vih cdti vil vih vil c1 c0 r/w a4 tcckl tcckh tcds tcdh figure 6 . write command input timing csn vih cclk vil vih cdti vil vih vil d3 d2 d1 d0 tcsw tcsh figure 7 . write data input timing thigh scl sda vih tlow tbuf thd:sta tr tf thd:dat tsu:dat tsu:sta stop start start stop tsu:sto vil vih vil tsp figure 8 . i 2 c bus mode timing tpd vil pdn f igure 9 . power - down & reset timing
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 13 - operation overview n system clock the external clocks required to operate the AK4367 are mclk(256fs/384fs/512fs), lrck(fs) and bick. the master clock (mclk) should be synchronized with sampl ing clock (lrck). the phase between these clocks does not matter. t he frequency of mclk is detected automatically, and the internal master clock becomes the appropriate frequency. table 1 shows system clock example. when the sampl ing frequency is changed during normal operation ( pmdac bit = ? 1 ? ), the dac output should be soft - muted or ? 0 ? data should be input to avoid click noise. lrck mclk (mhz) bick (mhz) fs 256fs 384fs 512fs 64fs 8khz 2.048 3.072 4.096 0.512 11.025khz 2.8224 4.2336 5.6448 0.7056 12khz 3.072 4.608 6.144 0.768 16khz 4.096 6.144 8.192 1.024 22.05khz 5.6448 8.4672 11.2896 1.4112 24khz 6.144 9.216 12.288 1.536 32khz 8.192 12.288 16.384 2.048 44.1khz 11.2896 16.9344 22.5792 2.8224 48khz 12.288 18.432 24.576 3.072 table 1 . system clock example all external clocks (mclk, bick and lrck) should always be present whenever the dac is in normal operation mode (pmdac bit = ? 1 ? ). if these clocks are not provided, the AK4367 may draw excess cu rrent and will not operate properly because it utilizes these clocks for internal dynamic refresh of registers. if the external clocks are not present, the dac should be placed in power - down mode (pmdac bit = ? 0 ? ). when mclk is input with ac coupling, the mckac bit should be set to ? 1 ? . for low sampling rates, dr and s/n degrade because of the outband noise. dr and s/n are improved by setting dfs1 bit to ? 1 ? . table 2 shows s/n of dac output for both the hp - amp and mout. when the d fs1 bit is ? 1 ? , mclk needs 512fs. s/n (fs=8khz, a - weighted) dfs1 dfs0 over sample rate fs mclk hp - amp mout 0 0 64fs 8khz ~ 48khz 256fs/384fs/512fs 56db 56db default 0 1 128fs 8khz ~ 24khz 256fs/384fs/512fs 75db 75db 1 x 256fs 8khz ~ 12khz 512fs 92 db 90db table 2 . relationship among fs, mclk frequency and s/n of hp - amp and mout
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 14 - n serial data interface the AK4367 interfaces with external system via the sdata, bick and lrck pins. five data formats are available and are sel ected by setting dif2, dif1 and dif0 bits ( table 3 ). mode 0 is compatible with existing 16bit dacs and digital filters. mode 1 is a 20bit version of mode 0. mode 4 is a 24bit version of mode 0. mode 2 is similar to akm adcs and man y dsp serial ports. mode 3 is compatible with the i 2 s serial data protocol. in modes 2 and 3 with bick 3 48fs , the following formats are also valid: 16 - bit data followed by eight zeros (17th to 24th bits) and 20 - bit data followed by four zeros (21st to 24th bits). in all modes, the serial data is msb first and 2 ? s complement format. dif2 bit dif1 bit dif0 bit mode bick figure 0 0 0 0: 16bit, lsb justified 32fs bick 64fs figure 10 0 0 1 1: 20bit, lsb justified 40fs bick 6 4fs figure 11 0 1 0 2: 24bit, msb justified 48fs bick 64fs figure 12 default 0 1 1 3: i 2 s compatible bick=32fs or 48fs bick 64fs figure 13 1 0 0 4: 24bit, lsb justified 48fs bick 64fs figure 11 table 3 . audio data format sdata bick lrck sdata 15 14 6 5 4 bick 3 2 1 0 15 14 (32fs) 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 10 . mode 0 timing sdata lrck bick 19 0 19 0 mode 1 don ? t care don ? t care 19:msb, 0:lsb sdata mode 4 23:msb, 0:lsb 20 19 0 20 19 0 don ? t care don ? t car e 22 21 22 21 lch data rch data 23 23 figure 11 . mod e 1, 4 timing
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 15 - lrck bick sdat a 16bit don?t 0 14 15 14 15 lch rch care 14 0 15 sdata 20 bit 1 8 1 9 1 8 1 9 4 1 0 don?t care 1 8 1 9 4 1 0 don?t care don?t care sdata 2 4 bit 22 23 22 23 don?t care 22 23 don?t care 8 3 4 0 1 8 3 4 0 1 figure 12 . mode 2 timing lrck lch rch bick don?t 0 14 15 15 care 14 0 15 1 9 1 8 1 9 4 1 0 don?t care 1 8 1 9 4 1 0 don?t care don?t care sdata 16bit sdata 20 bit sdata 2 4 bit 23 22 23 don?t care 22 23 don?t care 8 3 4 0 1 8 3 4 0 1 bick 6 14 15 15 14 6 15 sdata 16bit (32fs) 0 5 4 3 2 1 0 5 4 3 2 1 0 figure 13 . mode 3 timing
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 16 - n digital attenuator the AK4367 has a channel - independent digital attenuator (256 levels , 0.5db step). this digital attenuator is placed before the d/a converter. attl/r7 - 0 bits set the attenuation level (0db to - 127db or mute) for each channel ( table 4 ). at dattc= ? 1 ? , attl7 - 0 bits control both lch and rch attenuatio n levels. at dattc= ? 0 ? , attl7 - 0 bits control the lch level and attr7 - 0 bits control the rch level. when hpm= ? 1 ? , (l+r)/2 summation is done after volume control. attl7 - 0 attr7 - 0 attenuation ffh 0db feh - 0.5db fdh - 1.0db fch - 1.5db : : : : 0 2h - 126.5db 01h - 127.0db 00h mute ( - ) default table 4 . digital volume att values the ats bit sets the transition time between set values of att7 - 0 bits as either 1061/fs or 7424/fs ( table 5 ). when ats = ? 0 ? , a soft transition between the set values occurs(1062 levels). it takes 1061/fs (24ms@fs=44.1khz) from ffh(0db) to 00h(mute). the atts are 00h when the pmdac bit is ? 0 ? . when the pmdac returns to ? 1 ? , the atts fade to their current value. digital att enuator is independent of the soft mute function. att speed ats 0db to mute 1 step 0 1061/fs 4/fs default 1 7424/fs 29/fs table 5 . transition time between set values of att7 - 0 bits mout volume is controlled by attm3 - 0 bits when mmute= ? 0 ? ( table 6 ). click noise occurs when att3 - 0 bits are changed. mmute attm3 - 0 attenuation 0fh 0db 0eh - 2db 0dh - 4db 0ch - 6db : : : : 01h - 28db 0 00h - 30db 1 x mute default table 6 . mout volume att values
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 17 - n soft mute soft mute operation is performed at digital domain. when the smute bit goes to ? 1 ? , the output signal is attenuated by - during att_data att transition time ( table 5 ) from the c urrent att level. when 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 to - after starting the oper ation, the attenuation is discontinued and returned to att level by the same cycle. the soft mute is effective for changing the signal source without stopping the signal transmission. smute bit attenuation ats bit 0db - analog output gd gd (1) (2) (3) ats bit (1) figure 14 . soft m ute function notes: (1) att_data att transition time ( table 5 . transition time between set values of att7 - 0 bits ). for example, this time is 3712lrck cycles (3712/fs) at att_data=128. (2) the analog output corresponding to the digital in put has a group delay, gd. (3) if the soft mute is cancelled before attenuating to - after starting the operation, the attenuation is discontinued and returned to att level by the same cycle.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 18 - n de - emphasis filter the AK4367 includes a digital de - emphasis filter (tc = 50/15 m s) by iir filter corresponding to three sampling frequencies (32khz, 44.1khz and 48 khz) . the de - emphasis filter is enabled by setting dem1 - 0 bits ( table 7 ). dem1 bit dem0 bit de - emphasis 0 0 44.1khz 0 1 off default 1 0 48khz 1 1 32khz table 7 . de - emphasis filter frequency select n bass boost function by controlling bst1 - 0 bits, the low frequency boost signal can be output from dac. the setting value is common in lch and rch ( table 8 ). bst1 bit bst0 bit boost 0 0 off default 0 1 min 1 0 mid 1 1 max table 8 . low frequency boost select n system reset the AK4367 should be reset once by bringing pdn ? l ? upon power - up. afte r exiting reset, vcom, dac, hpl, hpr and mout switch to the power - down state. the contents of the control register are maintained until the reset is done. dac exits reset and power down state by mclk after pmdac bit is changed to ? 1 ? , and then dac is powe red up and the internal timing starts clocking by lrck ? - ? . dac is in power - down mode until mclk and lrck are input.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 19 - n headphone output power supply voltage for the headphone - amp is supplied from the hvdd pin and centered on the mutet voltage. the headp hone - amp output load resistance is min.16 w . when the muten bit is ? 1 ? at pmhpl=pmhpr= ? 1 ? , the common voltage rises to 0.45 x vdd . when the muten bit is ? 0 ? , the common voltage of headphone - amp falls and the outputs (hpl and hpr pins) go to vss. a capacito r between the mutet pin and ground reduces pop noise at power - up /down. [example] : a capacitor between the mutet pin and ground = 1.0 m f: time constant of rise/fall time: t = 100ms when pmhpl and pmhpr bits are ? 1 ? , the headphone - amp is powered - down, and the outputs (hpl and hpr pins) go to vss. muten bit pmhpl/r bit hpl/r pin (1) (2) (4) (3) figure 15 . power - up/power - down timing for headphone - amp (1) headphone - amp power - up (pmhpl and pmhpr bits= ? 1 ? ). the outputs are still vss. (2) headphone - amp common vo ltage rise up (muten bit= ? 1 ? ). common voltage of headphone - amp is rising . this rise time depends on the capacitor value connected with the mutet pin. the time constant is t = 100k x c when the capacitor value on mutet pin is ? c ? . (3) headphone - amp common volt age fall down (muten bit= ? 0 ? ). common voltage of headphone - amp is fall ing to vss. this fall time depends on the capacitor value connected with the mutet pin. the time constant is t = 100k x c when the capacitor value on mutet pin is ? c ? . (4) headphone - amp pow er - down (pmhpl, pmhpr bits= ? 0 ? ). the outputs are vss. if the power supply is switched off or headphone - amp is powered - down before the common voltage goes to vss, some pop noise occurs.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 20 - the cut - off frequency of headphone - amp output depends on the externa l resistor and capacitor used . table 9 shows the cut off frequency and the output power for various resistor/capacitor combinations. the headphone impedance r l is 16 w . output powers are shown at hvdd = 2.4, 3.0 and 3.3v. the output voltage of headphone is 0.58 x vdd (vpp)@ - 3dbfs. AK4367 hp-amp 16 w headphone r c figure 16 . external circuit example of headphone output power [mw] r [ w ] c [ m f] fc [hz] boost=off fc [hz] boost=min 2.4v 3.0v 3.3v 220 45 17 0 100 100 43 15 24 29 100 70 28 6.8 47 149 78 7 12 14 100 50 19 16 47 106 47 4 6 7 table 9 . relationship of external circuit, output power and frequency response
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 21 - n power - up/down sequence 1) dac ? hp - amp power supply pdn pin pmvcm bit clock input (3) sdti pin pmdac bit dac internal state pd normal operation hpl/r p in pmhpl, pmhpr bit (6) attl7 - 0 attr7 - 0 bit 00h(mute) ffh(0db) (8) gd (9) 1061/fs pd normal operation 00h(mute) ffh(0db ) (8) (9) (6) (7) (8) (9) don ? t care don ? t care (7) (8) (9) 00h(mute) don ? t care (9) don ? t care (1) >150ns (2) >0 pd (5) >2ms muten bit dacl, dacr bit (4) >0 (4) >0 (5) >2ms figure 17 . power - up/down sequence of dac and hp - amp (1) pdn pin should be set to ? h ? at least 150ns after the power is supplied. (2) pmvcm and pmdac bits should be changed to ? 1 ? after pdn pin goes to ? h ? . (3) external clock s (mclk, bick, lrck) are needed to operate dac. when pmdac= ? 0 ? , these clocks can be stopped. headphone amp can operate without these clocks. (4) dacl and dacr bits should be changed to ? 1 ? after pmdac bit is changed to ? 1 ? . (5) pmhpl, pmhpr and muten bits should be changed to ? 1 ? at least 2ms after dacl and dacr bits are changed to ? 1 ? . (6) rise time of headphone amp is determined by external capacitor (c) of mutet pin. time constant is 100k x c. when c=1 f, time constant is 100ms. (7) fall time of headphone amp is determ ined by external capacitor (c) of mutet pin. time constant is 100k x c. when c=1 f, time constant is 100ms. pmhpl, pmhpr, dacl and dacr bits should be changed to ? 0 ? after hpl and hpr pins go to vss. (8) analog output corresponding to digital input has the gro up delay (gd) of 20.8/fs(=472 s@fs=44.1khz) . (9) ats bit sets transition time of digital attenuator. default value is 1061/fs(=24ms@fs=44.1khz). (10) power supply should be switched off after headphone amp is powered down (hpl/r pins become ? l ? ).
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 22 - 2) dac ? mout power supply pdn pin pmvcm bit clock input (5) sdti pin pmdac bit dac internal state pd(pow er - down) normal operation pmmo bit attl/r7 - 0 bit 00h(mute) ffh(0db) mout pin (6) mmute, attm3 - 0 bit 10h(mute) 0fh(0db) (7) gd (8) 1061/fs (hi - z) pd normal operation 00h(mute) ffh(0db) (hi - z) (7) (8) (6) (6) (7) (8) don ? t care don ? t care don ? t care (1) >150ns (2) >0 (4) >0 dacm bit (3) >0 figure 18 . power - up/down sequence of dac and mout (1) pdn pin should be set to ? h ? at least 150ns after the power is supplied. (2) pmvcm bit should be changed to ? 1 ? after pdn pin goes to ? h ? . (3) dacm bit should be changed to ? 1 ? after pmvcm bit is changed to ? 1 ? . (4) pmdac and pmmo bits should be changed to ? 1 ? after dacm bit is changed to ? 1 ? . (5) external clocks (mclk, bick, lrck) are needed to operate dac. when pmdac= ? 0 ? , these clocks can be stopped. mout buffer can ope rate without these clocks. (6) when pmmo bit is changed, click noise is output from mout pin. (7) analog output corresponding to digital input has the group delay (gd) of 20.8/fs(=472 s@fs=44.1khz) . (8) ats bit sets transition time of digital attenuator. default value is 1061/fs(=24ms@fs=44.1khz).
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 23 - 3) lin/rin/min ? hp - amp, mout power supply pdn pin pmvcm bit hpl/r pin (6) mout pin (8) mmute, attm3 - 0 bit 10h(mute) 0fh(0db) (hi - z) (hi - z) (8) (8) (6) (7) lin/rin/min pin (4) (hi - z) (hi - z) pmhpl/r bit don ? t care (1) >150ns (2) >0 (5) >2ms muten bit pmmo bit linl, minl,rinr, minr linm, rinm, minm bit (3) >0 (5) >0 figure 19 . power - up/down sequence of lin/rin/min, hp - amp and mout (1) pdn pin should be set to ? h ? at least 150ns after the power is supplied. (2) pmvcm bit should be changed to ? 1 ? after pdn pin goes to ? h ? . (3) linl, minl, rinr, minr, linm, rinm and minm bits should be changed to ? 1 ? after pmvcm bit is changed to ? 1 ? . (4) when linl, minl, rinr, minr, linm, rinm or minm bit is changed to ? 1 ? , lin, rin or mi n pin is biased to 0.45 x vdd voltage. (5) pmhpl, pmhpr, muten and pmmo bits should be changed to ? 1 ? at least 2ms after linl, minl, rinr, minr, linm, rinm and minm bits are changed to ? 1 ? . (6) rise time of headphone amp is determined by external capacitor (c) of mutet pin. time constant is 100k x c. when c=1 f, time constant is 100ms. (7) fall time of headphone amp is determined by external capacitor (c) of mutet pin. time constant is 100k x c. when c=1 f, time constant is 100ms. pmhpl, pmhpr, linl, minl, rinr, minr, linm, rinm and minm bits should be changed to ? 0 ? after hpl and hpr pins go to vss. (8) when pmmo bit is changed, click noise is output from mout pin.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 24 - n serial control interface (1) 3 - wire serial control mode (i2c pin = ? l ? ) internal registers may be written via to the 3 wire p interface pins ( csn , cclk and cdti). the data on this interface consists of chip address (2bits, fixed to ? 01 ? ), read/write (1bit, fixed to ? 1 ? , write only), register address (msb first, 5bits) and control data (msb first, 8bits). add ress and data is clocked in on the rising edge of cclk. for write operations, data is latched after a low - to - high transition of csn . the clock speed of cclk is 5mhz(max). the value of internal registers is initialized at pdn= ? l ? . cdti cclk csn c1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 d4 d5 d6 d7 a1 a2 a3 a4 r/w c0 a0 d0 d1 d2 d3 c1 - c0: chip address (fixed to ? 01 ? ) r/w: read/write (fixed to ? 1 ? , write only) a4 - a0: register address d7 - d0: control data figure 20 . 3 - wire serial control i/f timing
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 25 - (2) i 2 c - bus control mode (i2c pin = ? h ? ) the AK4367 supports the standard - mode i 2 c - bus (max: 100khz). the AK4367 does n o t support a fast - mode i 2 c - bus system (max: 400khz). (2) - 1. write operations figure 21 shows the data transfer sequence for the i 2 c - bus mode. all co mmands are preceded by a start condition. a high to low transition on the sda line while scl is high indicat es a start condition ( figure 27 ) . after the start condition, a slave address is sent. this address is 7 bits long followed by an eighth bit that is a data direction bit (r/w). the most significant five bits of the slave address are fixed as ? 00 10 0 ?. the next two bits are cad1 and cad0 (device address bits ) . these two bits identify the specific device on the bus. the hard - wired input pins (cad1 and cad0 pin s ) set the se device address bits ( figure 22 ) . if the slave address matches that of the AK4367, the AK4367 generates an acknowledge and the operation is executed. the maste r must generate the acknowledge - related clock pulse and release the sda line (high) during the acknowledge clock pulse ( figure 28 ). a r/w bit value of ? 1 ? indicates that the read operation is to be executed. a ?0? in dicates that the write operation is to be executed. the second byte consists of the control register address of the AK4367. the format is msb first, and those most significant 3 - bits are fixed to zeros ( fi gure 23 ). the data after the second byte contains control data. the format is msb first, 8bits ( figure 24 ). the AK4367 generates an acknowledge after each byte has been received. a data transfer is always terminated by a stop condition genera ted by the master. a low to high transition on the sda line while scl is high defines a stop condition ( figure 27 ) . the AK4367 can perform more than one byte write operation per sequence . after receipt of the third byte the AK4367 generates an acknowledge and awaits the next data. t he master can transmit more than one byte instead of terminating the write cycle after the first data byte is transferred. after receiving each data packet the internal 5 - bit address count er is incremented by one , and the next data is automatically taken into the next address. if the address exceeds 08h prior to generating the stop condition, the address counter will ?roll over? to 00h and the previous data will be overwritten. the data on the sda line must remain stable during the high period of the clock. the high or low state of the data line can only change when the clock signal on the scl line is low ( f igure 29 ) except for the start and stop cond itions. sda slave address s s t a r t r/w="0" a c k sub address(n) a c k data(n) a c k data(n+1) a c k a c k data(n+x) a c k p s t o p figure 21 . data transfer sequence at the i 2 c - bus mode 0 0 1 0 0 0 cad0 r/w ( those cad0 should match with cad0 pin) figure 22 . the first byte 0 0 0 a4 a3 a2 a1 a0 fi gure 23 . the second byte d7 d6 d5 d4 d3 d2 d1 d0 figure 24 . byte structure after the second byte
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 26 - (2) - 2. read operations set the r /w bit = ? 1 ? for the read operation of the AK4367 . after transmission of d ata, t he master can read the next address ? s data by generating an acknowledge instead of terminating the write cycle after the receipt of the first data word. after receiving each data packet the internal 5 - bit address counter is incremented by one, and th e next data is automatically taken into the next address. if the address exceeds 08h prior to generating a stop condition, the address counter will ?roll over? to 00h and the previous data will be overwritten. the AK4367 supports two basic read operations : current address read and random address read . (2) - 2 - 1. current address read t he AK4367 contains an internal address counter that maintains the address of the last word accessed, incremented by one. therefore, if the last access (either a read or write) were to address n, the next current read operation would access data from the address n+1. after receipt of the slave address with r/w bit set to ? 1 ?, the AK4367 generates an acknowledge , transmits 1 - byte of data to the address set by the internal address counter and increments the internal address counter by 1 . if t he master does not generate an acknowledge to the data but instead generate s a stop condition, the AK4367 ceases transmission . sda slave address s s t a r t r/w="1" a c k a c k data(n+1) a c k data(n+2) a c k a c k data(n+x) a c k p s t o p data(n) figure 25 . current address read (2) - 2 - 2. random address read the random read operation allow s the master to access any memory location at random. prior to issuing the slave address with the r/w bit set to ? 1 ?, the master must first perform a ?dummy? write operation. the master issues a start request , a slave address ( r/w bit = ? 0 ? ) and then the register address to read. after the register address i s acknowledge d , the master immediately reissues the start request and the slave address with the r/w bit set to ? 1 ?. the AK4367 then generates an acknowledge , 1 byte of data and increments the internal address counter by 1. if t he master does not generate an acknowledge to the data but instead generate s a stop condition, the AK4367 ceases transmission. sda slave address s s t a r t r/w="0" a c k a c k a c k data(n) a c k data(n+x) a c k p s t o p sub address(n) s slave address r/w="1" s t a r t data(n+1) a c k a c k figure 26 . random address read
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 27 - scl sda stop condition start condition s p figure 27 . start and stop conditions scl from master acknowledge data output by transmitter data output by receiver 1 9 8 start condition not acknowledge clock pulse for acknowledgement s 2 figure 28 . acknowledge on the i 2 c - bus scl sda data line stable; data valid change of data allowed f igure 29 . bit transfer on the i 2 c - bus
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 28 - n register map addr register name d7 d6 d5 d4 d3 d2 d1 d0 00h power management 0 0 pmmo muten pmhpr pmhpl pmdac pmvcm 01h mode control 0 0 mckac hpm dif2 dif1 dif0 dfs1 dfs0 02h mode con trol 1 0 0 mmute smute bst1 bst0 dem1 dem0 03h mode control 2 0 0 0 0 ats dattc bckp lrp 04h dac lch att attl7 attl6 attl5 attl4 attl3 attl2 attl1 attl0 05h dac rch att attr7 attr6 attr5 attr4 attr3 attr2 attr1 attr0 06h output select 0 0 0 minr minl r inr linl dacr dacl 07h output select 1 0 0 0 0 minm rinm linm dacm 08h mout att 0 0 0 0 attm3 attm2 attm1 attm0 all registers inhibit writing at pdn pin = ? l ? . for addresses from 09h to 1fh, data must not be written.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 29 - n register definitions addr re gister name d7 d6 d5 d4 d3 d2 d1 d0 00h power management 0 0 pmmo muten pmhpr pmhpl pmdac pmvcm r/w rd rd r/w r/w r/w r/w r/w r/w default 0 0 0 0 0 0 0 0 pmvcm: power management for vcom block 0: power off (default) 1: power on pmdac: power managemen t for dac blocks 0: power off (default) 1: power on when pmdac bit is change d from ? 0 ? to ? 1 ? , dac is powered - up to the current register values (att value, sampling rate, etc ). pmhpl: power management for lch of headphone amp 0: power off (default). hpl p in becomes vss(0v). 1: power on pmhpr: power management for rch of headphone amp 0: power off (default). hpr pin becomes vss(0v). 1: power on muten: headphone amp mute control 0: mute (default). hpl and hpr pins go to vss(0v). 1: normal operation. hpl an d hpr pins go to 0.45 x vdd. pmmo: power management for mono output 0: power off (default) mout pin becomes hi - z. 1: power on all blocks can be powered - down by setting the pdn pin to ? l ? regardless of register values setup. all blocks can be also powered - down by setting all power management bits to ? 0 ? . in this case, control register values are maintained.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 30 - addr register name d7 d6 d5 d4 d3 d2 d1 d0 01h mode control 0 0 mckac hpm dif2 dif1 dif0 dfs1 dfs0 r/w rd r/w r/w r/w r/w r/w r/w r/w default 0 0 0 0 1 0 0 0 dfs1 - 0: oversampling speed select ( table 2 ) default: ? 00 ? (64fs) dif2 - 0: audio data interface format select ( table 3 ) default: ? 10 ? (mode 2) hpm: mono output select of headphone ( table 10 ) 0: normal operation (default) 1: mono. (l+r)/2 signals from the dac are output to both lch and rch of headphone. dacl dacr hpm hpl pin output hpr pin output 0 0 x no output from dac no output from dac default 0 no output f rom dac output from rch of dac by 0db 0 1 1 no output from dac output from rch of dac by ? 6db 0 output from lch of dac by 0db no output from dac 1 0 1 output from lch of dac by ? 6db no output from dac 0 output from lch of dac by 0db output from rch of dac by 0db 1 1 1 output (l+r)/2 from dac output (l+r)/2 from dac table 10 . mono output select of headphone (x: don ? t care) mckac: mclk input mode select 0: cmos input (default) 1: ac coupling input addr register name d7 d6 d5 d4 d3 d2 d1 d0 02h mode control 1 0 0 mmute smute bst1 bst0 dem1 dem0 r/w rd rd r/w r/w r/w r/w r/w r/w default 0 0 0 0 0 0 0 1 dem1 - 0: de - emphasis filter frequency select ( table 7 ) default: ? 01 ? (off) bst1 - 0: low freq uency boost function select ( table 8 ) default: ? 00 ? (off) smute: soft mute control 0: normal operation (default) 1: dac outputs soft - muted mmute: mute control for mout ( table 6 ) 0: normal operation. attm3 - 0 bits control attenuation value. 1: mute. attm3 - 0 bits are ignored. (default)
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 31 - addr register name d7 d6 d5 d4 d3 d2 d1 d0 03h mode control 2 0 0 0 0 ats dattc bckp lrp r/w rd rd rd rd r/w r/w r/w r/w default 0 0 0 0 0 0 0 0 lrp: lrck polarity sele ct 0: normal 1: invert bckp: bick polarity select 0: normal 1: invert dattc: dac digital attenuator control mode select 0: independent (default) 1: dependent at dattc= ? 1 ? , attl7 - 0 bits control both lch and rch attenuation level, while register values of attl7 - 0 bits are not written to attr7 - 0 bits. at dattc= ? 0 ? , attl7 - 0 bits control lch level and attr7 - 0 bits control rch level. ats: digital attenuator transition time setting ( table 5 ) default: ? 00 ? (1061/fs) addr register na me d7 d6 d5 d4 d3 d2 d1 d0 04h dac lch att attl7 attl6 attl5 attl4 attl3 attl2 attl1 attl0 05h dac rch att attr7 attr6 attr5 attr4 attr3 attr2 attr1 attr0 r/w r/w r/w r/w r/w r/w r/w r/w r/w default 0 0 0 0 0 0 0 0 attl7 - 0: setting of the attenuation value of output signal from dacl ( table 4 ) attr7 - 0: setting of the attenuation value of output signal from dacr ( table 4 ) default: ? 00h ? (mute) the ak4566 has channel - independent digital attenuator (256 l evels, 0.5db step). this digital attenuator is placed before d/a converter. attl/r7 - 0 bits set the attenuation level (0db to - 127db or mute) of each channel. digital attenuator is independent of soft mute function.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 32 - addr register name d7 d6 d5 d4 d3 d2 d 1 d0 06h output select 0 0 0 minr minl rinr linl dacr dacl r/w rd rd r/w r/w r/w r/w r/w r/w default 0 0 0 0 0 0 0 0 dacl: dac lch output signal is added to lch of headphone amp. 0: off (default) 1: on dacr: dac rch output signal is added to rch of h eadphone amp. 0: off (default) 1: on linl: input signal to lin pin is added to lch of headphone amp. 0: off (default) 1: on rinr: input signal to rin pin is added to rch of headphone amp. 0: off (default) 1: on minl: input signal to min pin is added to lch of headphone amp. 0: off (default) 1: on minr: input signal to min pin is added to rch of headphone amp. 0: off (default) 1: on dacl/dacr - + hpl/hpr pin lin/rin pin min pin hp - amp r 1.23r r r linl/rinr bit minl/minr bit dacl/dacr bit - + r figure 30 . summation circuit for headphone amp output at hpm=0, gai n of summation is +1.8db for all input path.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 33 - addr register name d7 d6 d5 d4 d3 d2 d1 d0 07h output select 1 0 0 0 0 minm rinm linm dacm r/w rd rd rd rd r/w r/w r/w r/w default 0 0 0 0 0 0 0 0 dacm: dac lch and rch outputs are added to mout buffer a mp. summation gain is - 6db for each channel. 0: off (default) 1: on linm: input signal to lin pin is added to mout buffer amp. 0: off (default) 1: on rinm: input signal to rin pin is added to mout buffer amp. 0: off (default) 1: on minm: input signal to min pin is added to mout buffer amp. 0: off (default) 1: on dacr - + mout pin lin pin rin pin 2r r 2r 2r min pin r dacl 2r linm bit rinm bit minm bit dacm bit figure 31 . summation circuit for mout gain of summation is 0db for min and - 6db for lin, rin, dacl and dacr. addr register name d7 d6 d5 d4 d3 d2 d1 d0 08h mout att 0 0 0 0 attm3 attm2 attm1 attm0 r/w rd rd rd rd r/w r/w r/w r/w default 0 0 0 0 0 0 0 0 attm3 - 0: analog volume control for mout ( table 6 ) default: mmute= ? 1 ? , attm3 - 0= ? 0000 ? (mute) setting of att m3 - 0 bits is enabled at mmute bit is ? 0 ? .
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 34 - system design figure 32 shows the system connection diagram. an evaluation board [akd4367] is available which demonstrates the optimum layout, power supply arrangements and measuremen t results. cdti cclk csn sdata lrck lin rin min hpl hpr hvdd vss vdd mutet vcom bick mcl k pdn i2c mout top view 1 2 3 4 5 15 14 13 12 11 20 19 18 17 16 6 7 8 9 10 mode setting audio controller 16 w 16 w c c headphone 0.1 u 10 u 0.1 u 0.1 u 2.2 u 1 u analog supply 2.2 ~ 3.6v 1000p 0.1 u 0.1 u 0.1 u r r figure 32 . typical connection diagram (in case of ac coupling to mclk) (3 - wire serial mode)
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 35 - 1. grounding and power supply decoupling the AK4367 requires careful attention to power supply and grounding arrangements. vdd and hvdd are usually supplied from the analog power supply in the system. when vdd and hvdd are supplied separately, vdd must be powered - up at the same time or earlier than hvdd. when the AK4367 is powered - down, hvdd must be powered - down at the same time or later than vdd. vss must be connected to the analog ground plane. system analog ground and digital ground should be connected together near to where the supplies are brought onto the printed circuit board. decoupling capac itors should be as close to the AK4367 as possible, with the small value ceramic capacitors being the nearest. 2. voltage reference the input voltage to vdd pin sets the analog output range. a 0.1 m f ceramic capacitor and a 10 m f electrolytic capacitor is connected between vdd and vss pins, normally. vcom is a signal ground of this chip (0.45 x vdd). an electrolytic 2.2 m f in parallel with a 0.1 m f ceramic capacitor attached between vcom and vss pins eliminates the effects of high frequency noise. no load cur rent may be drawn from vcom pin. all signals, especially clock, should be kept away from vdd and vcom pins in order to avoid unwanted coupling into the AK4367. 3. analog outputs the analog outputs are single - ended outputs, and 0.58xvdd vpp(typ)@ - 3dbfs fo r headphone amp and 0.66xvdd vpp(typ) for mout centered on the vcom voltage. the input data format is 2 ? s compliment. the output voltage is a positive full scale for 7fffffh(@24bit) and negative full scale for 800000h(@24bit). the ideal output is vcom volt age for 000000h(@24bit). if the noise generated by the delta - sigma modulator beyond the audio band causes problems, attenuation by an external filter is required. dc offsets on the analog outputs is eliminated by ac coupling since the analog outputs have a dc offset equal to vcom plus a few mv.
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 36 - package 20pin qfn (unit: mm) 4.20 0.10 4.20 0.10 0.22 0.05 4.00 0.05 4.00 0.05 0.50 0.05 m 0.05 1.00 s ab 1.00 c0.7 0.22 0.05 45.0 45.0 3 - 0.69 0.11 0.35 0.11 0.50 b a 3 - c0.2 0.60 0.10 s + 0.03 - 0.05 0.22 s 0.02typ 0.005min 0.04max 0.90 0.05 note: the black parts of back package should be open. n package & lead frame material package molding compound: epoxy lead frame material: cu lead frame surface treatment : solder (pb free) plate
asahi kasei akm confidential [AK4367] rev 0.7 2003/3 - 37 - marking 4367 xxxx 1 xxxx : date code identifier (4 digits) i m portant notice these products and their specifications are subject to change without notice. before considering any use or applicat ion, 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, curr ency 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, exc ept 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 exp ected 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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