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mosa ms6266 6-channel electronic volume controller rev 2 1/13 www.mosanalog.com 6-channel volume controller gain and attenuation 16~-79db low voltage, high channel separation features ? operation range: 2.7v~6.5v ? low power consumption ? gain/attenuation: 16db to ?79db at 1db/step ? good psrr ?i 2 c interface ? pop noise free ? housed in ssop20, sop20 applications ? multimedia system ? hi-fi audio system ? car audio ? portable audio equipment description the ms6266 is a 6-channel volume controller ic with gain and attenuation. it uses cmos technology specially for the low voltage application with low noise, ra il-to-rail output. the ms6266 provide an i 2 c control interface with gain / attenuation range of 16db to -79db, 1db/step. the initial condition is set to be maximum attenuation ?79db and mute on mode when the power is on. pin configuration symbol pin description in1 1 1 st channel input in2 2 2 nd channel input in3 3 3 rd channel input ac2 4 address code 2 dgnd 5 digital ground scl 6 i 2 c clock input sda 7 i 2 c data input in4 8 4 th channel input in5 9 5 th channel input in6 10 6 th channel input out6 11 6 th channel output out5 12 5 th channel output out4 13 4 th channel output gnd 14 analog ground v ref 15 reference voltage = 1/2v dd v dd 16 positive supply voltage ac1 17 address code 1 out3 18 3 rd channel output out2 19 2 nd channel output out1 20 1 st channel output 19 18 17 20 2 3 4 1 out1 out2 out3 ac1 in1 in2 in3 ac2 15 14 13 16 12 11 6 7 8 5 9 10 ms6266 v dd v ref gnd out4 out5 out6 in6 in5 in4 sda scl dgnd note: 1. the address codes have four types, selected by ac1and ac2.
mosa ms6266 6-channel electronic volume controller rev 2 2/13 www.mosanalog.com block diagram i 2 c interface reference source -1db/step -10db/step in1 in2 gnd sda scl v ref out1 in6 -1db/step -1db/step out2 out6 ac1 ac2 dgnd v dd v ref 2db/step -10db/step 2db/step -10db/step 2db/step ordering information package part number packag ing marking transport media 20-pin sop (lead free) MS6266GTR ms6266g 1k units tape and reel 20-pin sop (lead free) ms6266gu ms6266g 35 units tube 20-pin ssop (lead free) ms6266ssgtr ms6266g 2.5k units tape and reel 20-pin ssop (lead free) ms6266ssgu ms6266g 50 units tube absolute maximum ratings symbol parameter rating unit v dd supply voltage 6.5 v v esd electrostatic handling -3000 to 3000 v t stg storage temperature range -65 to 150 t a operating ambient temperature range -40 to 85 t j maximum junction temperature 150 t s soldering temperature, 10 seconds 260 r thja thermal resistance from junc tion to ambient in free air sop20 ssop20 210 210 /w operating ratings symbol parameter min typ max unit v dd supply voltage 2.7 - 6.5 v
mosa ms6266 6-channel electronic volume controller rev 2 3/13 www.mosanalog.com 5v electrical characteristics (v dd =5.0v, v ss =0v, attenuation=0db, gain=0db, f=1khz, v o =0dbv, v ref cap=10uf; unless otherwise specified) symbol parameter conditions min typ max unit dc characteristics i q quiescent current - 10.4 11 ma max gain - 16 - db a ga gain/attenuation max attenuation - -79 - db a step gain/attenuation step - 1 - db e ga gain/attenuation step error - 0.3 - db e iga interchannel gin/attenuation error - 0.3 - db cs channel separation 95 105 - db psrr power supply rejection ratio cap = 10uf (100hz) - 53 - db mute mute attenuation vin=0dbv - 85 - db rin input impedance 18 20 - k rout output impedance - 50 100 ac characteristics vo maximum output voltage swing (thd+n)/s < 0.1% - 4.8 - vpp thd+n total harmonic distortion plus noise - -69 -64 db s/n signal-to-noise ratio v o =4.8vpp 95 100 - db bus characteristics v ih bus high input level - - 0.7v dd v v il bus low input level 0.3v dd - - v 2.7v electrical characteristics (v dd =2.7v, v ss =0v, attenuation=0db, gain=0db, f=1khz, v o =-3dbv, v ref cap=10uf; unless otherwise specified) symbol parameter conditions min typ max unit dc characteristics i q quiescent current - 8.2 8.8 ma cs channel separation 90 100 - db psrr power supply rejection ratio cap = 10uf (100hz) - 51 - db mute mute attenuation vin=-3dbv - 80 - db ac characteristics vo maximum output voltage swing (thd+n)/s < 0.1% - 2.6 - vpp thd+n total harmonic distortion plus noise - -69 -64 db s/n signal-to-noise ratio v o =2.6vpp 85 90 - db
mosa ms6266 6-channel electronic volume controller rev 2 4/13 www.mosanalog.com typical performance characteristics (ta=25 , r l =100k ? , v ref cap=10uf; unless otherwise specified) thd+n (%) output voltage (dbv) thd+n (%) output voltage (dbv) thd+n (%) output voltage (dbv) thd+n vs. output voltage thd+n vs. output voltage thd+n vs. output voltage f=20khz f=20khz f=20khz f=20hz f=20hz f=20hz f=1khz f=1khz f=1khz v dd =5v v dd =2.7v v dd =3.3v thd+n (%) frequency (hz) channel separation (db) frequency (hz) quiescent current (ma) supply voltage (v) thd+n vs. frequency channel separation vs. frequency quiescent current vs. supply voltage v dd =5v v o =0dbv v dd =3.3v v o =-3dbv v dd =2.7v v o =-3dbv v dd =3.3v v o =-3dbv v dd =2.7v v o =-3dbv v dd =5v v o =0dbv psrr (db) frequency (hz) psrr (db) frequency (hz) psrr (db) frequency (hz) psrr vs. frequency psrr vs. frequency psrr vs. frequency cap=22uf cap=22uf cap=22uf cap=10uf cap=10uf cap=10uf cap=2.2uf cap=2.2uf cap=2.2uf v dd =5v v rr =-20dbv v dd =3.3v v rr =-20dbv v dd =2.7v v rr =-20dbv
mosa ms6266 6-channel electronic volume controller rev 2 5/13 www.mosanalog.com i 2 c bus description start and stop conditions a start condition is activated when the scl is set to high and sda shifts from high to low state. the stop condition is activated when scl is set to high and sda sh ifts from low to high state. please refer to the timing diagram below. sda scl start stop scl : serial clock line, sda : serial data line data validity a data on the sda line is considered valid and stable only when the scl signal is in high state. the high and low states of the sda line can only change when the sc l signal is low. please refer to the figure below. sda scl data line stable, data valid data change allowed byte format ev ery byte transmitted to the sda line consists of 8 bits . each byte must be followed by an acknowledge bit. the msb is transmitted first. acknowledge d uring the acknowledge clock pulse, the master (up) put a resistive high level on the sda line. the peripheral (audio processor) that acknowledges has to pull-down (low) the sda line during the acknowledge clock pulse so that the sda line is in a stable low state during this clock pulse. please refer to the diagram below. scl sda msb acknowledge 123 789 start the audio processor that has been addr essed has to generate an acknowledge after receiving each byte, otherwise, the sda line will remain at the high level during the ninth (9 th ) clock pulse. in this case, the master transmitter can generate the stop information in order to abort the transfer.
mosa ms6266 6-channel electronic volume controller rev 2 6/13 www.mosanalog.com timing of sda and scl bus lines t f s t low t hd;sta t r t hd;dat t su;dat t f t high t hd;sta t su;sta s r sp t sp t su;sto t r t buf sda scl standard mode symbol parameter min max unit f scl scl clock frequency 0 100 khz t hd:sta hold time (repeated) start condition. after this period, the first clock pulse is generated 4.0 - us t low low period of the scl clock 4.7 - us t high high period of the scl clock 4.0 - us t su:sta set-up time for a repeated start condition 4.7 - us t hd:dat data hold time: for i 2 c-bus devices 0 3.45 us t su:dat data-set-up time 250 - ns t r rise time of both sda and scl signals - 1000 ns t f fall time of both sda and scl signals - 300 ns t su:sto set-up time for stop condition 4.0 - us t buf bus free time between a stop and start condition 4.7 - us c b capacitive load for each bus line - 400 pf v nl n oise margin at the low level for each connected device (including hysteresis) 0.1v dd - v v nh n oise margin at the high level for each connected device (including hysteresis) 0.2v dd - v
mosa ms6266 6-channel electronic volume controller rev 2 7/13 www.mosanalog.com bus interface data are transmitted to and from the mcu to the ms6 266 via the sda and scl. the sda and scl make up the bus interface. it should be noted that pull-up resistors must be connected to the positive supply voltage. sda (serial data line) rp rp scl (serial clock line) pull up resistors v dd mcu ms6266 interface protocol the fo rmat consists of the following ? a start condition ? a chip address byte including the ms6266 address. (7bits) ? the 8 th bit of the byte must be ?0?.(write=0, read=1) ? ms6266 must always acknowledge th e end of each transmitted byte. ? a data sequence (n-bytes + acknowledge) ? a stop condition scl sda 1-7 8 9 1-7 8 9 9 8 1-7 s p address r/ w -- ack ack ack data data start condition stop condition address code the m s6266 has four address codes, they were selected by ac1(pin17)and ac2(pin4). ac1 ac2 address code 0 0 80h 0 1 84h 1 0 88h 1 1 8ch ac1=1, ac2=0 1000 00 10 7 bits address ms6266 address w 0: connected to gnd, 1: connected to v dd
mosa ms6266 6-channel electronic volume controller rev 2 8/13 www.mosanalog.com data bytes description functi on bits msb lsb function 1 1 1 0 a3 a2 a1 a0 6 channels, -1db/step 1 1 0 1 b3 b2 b1 b0 6 channels, -10db/step or +2db/step 0 0 0 1 a3 a2 a1 a0 channel 3, -1db/step 0 0 0 0 b3 b2 b1 b0 channel 3, -10db/step or +2db/step 0 0 1 1 a3 a2 a1 a0 channel 4, -1db/step 0 0 1 0 b3 b2 b1 b0 channel 4, -10db/step or +2db/step 0 1 0 1 a3 a2 a1 a0 channel 2, -1db/step 0 1 0 0 b3 b2 b1 b0 channel 2, -10db/step or +2db/step 0 1 1 1 a3 a2 a1 a0 channel 5, -1db/step 0 1 1 0 b3 b2 b1 b0 channel 5, -10db/step or +2db/step 1 0 0 1 a3 a2 a1 a0 channel 1, -1db/step 1 0 0 0 b3 b2 b1 b0 channel 1, -10db/step or +2db/step 1 0 1 1 a3 a2 a1 a0 channel 6, -1db/step 1 0 1 0 b3 b2 b1 b0 channel 6, -10db/step or +2db/step 0 0 0 1 power off preparation (pop noise free) 1 0 0 1 6 channels, mute on 1 1 1 1 1 0 0 0 6 channels, mute off gain / attenuation bits a3 a2 a1 a0 gain / attenuation value (db) b3 b2 b1 b0 a b 0 0 0 0 0 0 0 0 0 1 -1 -10 0 0 1 0 -2 -20 0 0 1 1 -3 -30 0 1 0 0 -4 -40 0 1 0 1 -5 -50 0 1 1 0 -6 -60 0 1 1 1 -7 -70 1 0 0 0 -8 +2 1 0 0 1 -9 +4 1 0 1 0 - +6 1 0 1 1 - +8 1 1 0 0 - +10 1 1 0 1 - +12 1 1 1 0 - +14 1 1 1 1 - +16 1. where ax=-1db/step, bx=-10db/step or +2db/step, -10db and +2db should not be loaded at the same time. 2. the initial condition is set to be maximum attenuation ?79db and mute on mode when the power on. 3. the output will drop down to ground gr adually when enable pow er off preparation. 4. odd gain 2n-1= n*(+2db/step) + (-1db), wh ere n = 1~8. please reference to examples.
mosa ms6266 6-channel electronic volume controller rev 2 9/13 www.mosanalog.com examples mute off the initial condition is ?79db and mute on when power on. the first command must disable the mute function. data byte msb ack start 1111 00 10 ms6266 address 6 channels, mute off lsb stop ack 80h, 84h, 88h, 8ch set gain of 1 st channel at 0db ack start ms6266 address ack 1000 00 00 ch 1, -10db/step, 0db 1001 00 00 ack ch 1, -1db/step, 0db stop set attenuation of 5 th channel at -6db ack start ms6266 address ack 0110 00 00 ch 5, -10db/step, 0db 0111 10 01 ack ch 5, -1db/step, -6db stop set attenuation of 3 rd channel at ?33db ack start ms6266 address ack 0000 11 00 ch 3, -10db/step, -30db 0001 11 00 ack ch 3, -1db/step, -3db stop set gain of 3 rd channel at 3db ack start ms6266 address ack 0000 01 10 ch 3, +2db/step, 4db 0001 01 00 ack ch 3, -1db/step, -1db stop odd gain 3db = 2*2-1 = 2*(+2db)+(-1db) set power off preparation command to prevent pop noise before power is off. ack start ms6266 address ack 1 1 1 1 0 1 00 power off preparation stop
mosa ms6266 6-channel electronic volume controller rev 2 10/13 www.mosanalog.com application information basic application example mcu scl 6 7 sda v dd supply 16 15 10uf 0.1uf ms6266 10uf v ref gnd ac2 dgnd 4 5 10k in1 1 10uf signal-1 in 10k in2 2 10uf signal-2 in 10k in3 3 10uf signal-3 in 10k out1 20 10uf signal-1 out 10k out2 19 10uf signal-2 out 10k out3 18 10uf signal-3 out 10k out4 13 10uf signal-4 out 10k out5 12 10uf signal-5 out 10k out6 11 10uf signal-6 out 10k in4 8 10uf signal-4 in 10k in5 9 10uf signal-5 in 10k in6 10 10uf signal-6 in ac1 14 17 ac1=hi, ac2=lo, address=88h basic application flow chart volume control volume down to -79 db step by step enable mute function mute on power off v dd = 0v pop noise free power off preparation wait 0.5 sec procedure of power off procedure of power on volume control volume up/down step by step initial conditions function off (-79db) mute on pop noise free wait 1 sec disable mute function mute off power on v dd = 5v
mosa ms6266 6-channel electronic volume controller rev 2 11/13 www.mosanalog.com external dimensions ssop20 a a2 a1 d e1 e b e zd l1 detail a l 2 1 r1 r detail a h x 45 c sop2 0 (300mil) h d h x 45 c detail a 0.25mm detail a l e a a1 b e dimension in mm dimension in inch symbol min max min max a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.004 0.010 a2 1.50 0.059 b 0.20 0.30 0.008 0.012 c 0.18 0.25 0.007 0.010 e 0.635 basic 0.025 basic d 8.56 8.74 0.337 0.344 e 5.79 6.20 0.228 0.244 e1 3.81 3.99 0.150 0.157 l 0.41 1.27 0.016 0.050 h 0.25 0.50 0.010 0.020 l1 0.254 basic 0.010 basic zd 1.4732 ref 0.058 ref r1 0.20 0.33 0.008 0.013 r 0.20 0.008 0 o 8 o 0 o 8 o 1 0 o 0 o 2 5 o 15 o 5 o 15 o dimension in mm dimension in inch symbol min max min max a 2.35 2.65 0.0926 0.1043 a1 0.10 0.30 0.004 0.0118 b 0.33 0.51 0.013 0.020 c 0.23 0.32 0.0091 0.0125 e 1.27 bsc 0.050 bsc d 12.6 13 0.4961 0.5118 e 7.4 7.60 0.2914 0.2992 h 10.00 10.65 0.394 0.419 l 0.40 1.27 0.016 0.050 h 0.25 0.75 0.010 0.029 0 o 8 o 0 o 8 o
mosa ms6266 6-channel electronic volume controller rev 2 12/13 www.mosanalog.com demo board f 1.??? avdddvcc?M?? 2.7v~6.5v 2.I vol+I??I+1db+16dbIr??+ Wq?_ +16dbrt??+ ?B?y?r?AO?0db vol-I??I-1db-79dbIr??- Wq?_ -79dbrt??-?B mutemute on/off _P?y?rmute off ch?xIx??ch1~ch6all channelx????x channel 1t??ch1xall cha nnel r??ch1~ch6?rAO?all channel resetmcuIImcuB????yAO? 3.????ein1~ in6?B??? 4.?? ??eout1~out6???? 5.?x ms6266 data she etK???hQac1ac2? Q???demo board ???88h?D? h ac2 l ac1 h l 4 1 5 1 2 3
mosa ms6266 6-channel electronic volume controller rev 2 13/13 www.mosanalog.com circu it: + c5 r15 s4 - + c6 + c14 10u c17 104 s2 ch r13 10k r17 + c12 + c7 s3 + r14 + c1 10u * 12 + c8 + c13 10u r19 + c9 + c10 r21 1k * 8 c20 20pf c19 20pf + c2 + c11 r16 r22 10 in1 1 in2 2 in3 3 ac2 4 dgnd 5 scl 6 sda 7 in4 8 in5 9 in6 10 out1 20 out2 19 out3 18 ac1 17 vdd 16 vref 15 gnd 14 out4 13 out5 12 out6 11 u1 ms6266 + c16 10uf s1 mut e + c3 s5 reset + c15 10u r18 + c4 c18 104 r20 12m p3.7 11 rst 1 p1.0 12 p3.0 2 p1.1 13 p3.1 3 p1.2 14 xtal2 4 p1.3 15 xtal1 5 p1.4 16 p3.2 6 p1.5 17 p3.3 7 p1.6 18 p3.4 8 p1.7 19 p3.5 9 vcc 20 gnd 10 u3 at89c2051 1 2 j15 dvcc 1 2 j14 avdd 1 2 j1 in1 1 2 j2 in2 1 2 j3 in3 1 2 j4 in4 1 2 j5 in5 1 2 j6 in6 1 2 j7 out6 1 2 j8 out5 1 2 j9 out4 1 2 j10 out3 1 2 j11 out2 1 2 j12 out1 r1 100k * 12 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 1 2 3 4 5 6 j16 ac2 ac1 d8 ch1 d7 ch2 d6 ch3 d5 ch4 d4 ch5 d3 ch6 d2 vol+ d1 vol-

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