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SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?1?of?13 4-ch?output?stereo?audio?processor?with?4?stereo?inputs?and tone/volume?control sop-32-375-1.27 description ???the? ? SC7312? is? a? volume,? tone? (bass? and? treble),? balance? (left/? right) and? fader(front/rear)? processor? for? quality? audio? applications? in? car? radio and? hi-fi? systems.? selectable? input? gain? and? external? loud ness? function are? provided.? control? is? accomplished? by? serial? i 2 c? bus? microprocessor interface.? the? ac? signal? settings? is? obtained? by? resistor? networks? and switches? combined? with? operational? amplifiers.? due? to? the? used? cmos technology,?low?distortion,??low?noise?and?low?dc?stepping?are?obtained. features *?input?multiplexer: ?????--4?stereo?inputs ??????--selectable?input?gain?for?optimal?adaptation?to?different ?????????sources *?four?speaker?attenuators: ?--4?independent?speakers?control?in?1.25db?steps?for ????????balance?and?fader?facilities ?????--independent?mute?function ?*?all?functions?programmable?via?serial?i 2 c?bus *?loudness?function *?volume?control?in?1.25db?steps ordering?information device package SC7312s? sop-32-375-1.27 ?*?treble?and?bass?control *? input? and? output? for? external equalizer?or?noise?reduction?system block?diagram
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?2?of?13 absolute?maximum?ratings characteristics symbol ratings unit supply?voltages v s 10.2 v operating?temperature t amb -40?~?+85 c storage?temperature t stg -55?~?+150 c quick?reference?data characteristics symbol min. typ. max. unit supply?voltage v s 6 9 10 v maximum?input?signal?handling v cl 2 v rms total?harmonic?distortion?,v=1vrms, f=1khz thd 0.01 0.1 % signal?to?noise?ratio s/n 106 db channel?separation,?f=1khz s c 103 db volume?control,?1.25db?step -78.75 0 db bass?and?treble?control,?2db?step -14 +14 db fader?and?balance?control,?1.25db step -38.75 0 db input?gain,?3.75db?step 0 11.25 db mute?attenuation 100 db electrical?characteristics?(refer?to?the?test?circuit) (tamb=25 c,?vs=9.0v,?rl=10k w ,?rg=600 w ,?all?controls?flat(g=0),?f=1khz,unless?otherwise?specified) characteristics symbol test?conditions min. typ. max. unit supply?voltage operating?supply?voltage v s 6 9 10.0 v operating?supply?current i s 20.0 35.0 ma ripple?rejection?of?supply?voltage svr 60 80 db inputs?selectors input?resistance r ii input?1,?2,?3,?4 35 50 70 k w clipping?level v cl 2 2.5 vrms input?separation?(note?2) s in 80 100 db output?load?resistance r l pin?8,?21 4 k w minimum?input?gain g in(min) -1 0 1 db maximum?input?gain g in(max) 11.25 db step?resolution gstep 3.75 db input?noise e in g=11.25db 2 m v adjacent?gain?steps 4 20 mv dc?steps v dc g=18.75?to?mute 4 mv (to?be?continued)
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?3?of?13 (continued) characteristics symbol test?conditions min. typ. max. unit volume?control input?resistance r iv 20 33 50 k w control?range c range 70 75 80 db minimum?attenuation av(min) -1 0 1 db maximum?attenuation av(max) 70 75 80 db step?resolution astep 0.5? 1.25 1.75 db av=0?to??20db -1.25 0 1.25 attenuation?set?error ea av=-20?to??60db -3 2 db tracking?error et 2 db adjacent?attenuation?steps 0 3 mv dc?steps v dc from?0db?to?av?max 0.5 7.5? mv speaker?attenuators control?range c range 35? 37.5 40 db step?resolution sstep 0.5? 1.25 1.75 db attenuation?set?error ea 1.5 db output?mute?attenuation a mute 80 100 db adjacent?attenuation?steps 0 3 mv dc?steps v dc from?0db?to?mute 1 10 mv bass?control?(note?1) control?range gb maximum?boost/cut 12 14 16 db step?resolution bstep 1 2 3 db internal?feedback?resistance rb 34 44 58 k w treble?control?(note?1) control?range gt maximum?boost/cut 13 14 15 db step?resolution t step 1 2 3 db audio?outputs clipping?level v ocl ? thd=0.3% 2 2.5 vrms output?load?resistance r l 4 k w output?load?capacitance c l 10 nf output?resistance r out 30 75 120 w dc?voltage?level v out 4.2 4.5 4.8 v general bw=20?~20khz,flat output?muted 2.5 m v bw=20?~20khz,flat all?gains=0db 5 15 m v output?noise e no a?curve,?all?gains?=0?db 3 m v signal?to?noise?ratio s/n all?gains=0db;?v o =1vrms 106 db (to?be?continued)
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?4?of?13 (continued) characteristics symbol test?conditions min. typ. max. unit a v =0,v in =10mv 0.01 0.1 % a v= -20db,?v in =1vrms 0.09 0.3 % distortion d a v =-20db,v in =0.3vrms 0.04 % channel?separation?left/right s c 80 103 db a v =0?to??20?db 0 1 db total?tracking?error a v =-20?to??60?db 0 2 db bus?inputs input?low?voltage v il 1 v input?high?voltage v ih 3 v input?current i in -5 +5 m a output?voltage?sda?acknowledge v o i o =1.6ma 0.4 v notes: (1)? bass?and?treble?response?see?figure?16.?the?center?frequency?and?quality?of?the?response?behavior?can?be chosen? by?the? external? circuitry.? a? standard? first? order? bass? response? can? realized? by? a? standard? feedback network. (2)? the?selected?input?is?grounded?through?the?2.2 m f?capacitor. pin?configurations 1 2 3 4 5 6 7 8 9 10 11 12 13 14 32 31 30 29 28 27 26 25 24 23 22 21 20 19 c ref gnd v dd out (r) r3 r2 r1 loud??l l4 scl sda dig??gnd out??lf out??rf out??lr out??rr bout (r) bin (r) bout (l) bin (l) out (l) in (l) l1 l r in (r) loud??r treble right inputs ???left?inputs bus inputs bass 15 16 18 17 l2 l3 code r4 nc ???left?inputs ? s c 7 3 1 2
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?5?of?13 typical?characteristics?performance l o u d n e s s ( d b ) l o u d n e s s ( d b ) l o u d n e s s ( d b ) n o i s e ( v ) n o i s e ( v ) t h d & n o i s e ( % ) t h d & n o i s e ( % ) t h d ( % ) c h a n n e l s e p a r a t i o n ( d b )
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?6?of?13 typical?characteristics?performance?(continued) fig . 10?input?separation ( l1,l2,l3,l4 )??vs.?frequency 10 1 10 2 10 3 10 4 70 80 90 100 110 c h a n n e l s e p a r a t i o n ( d b ) frequency ( hz ) vin =1 vrms av =0 db all?controls?flat fig . 11?supply?voltage?rejection vs.?frequency 10 1 10 2 10 3 10 4 70 80 90 100 c h a n n e l s e p a r a t i o n ( d b ) frequency ( hz ) vsvr =0.5 vrms all?input?to?gnd av =0 db all?controls?flat 60 fig . 12?output?clipping?level?vs. supply?voltage supply?voltage (v) o u t p u t c l i p p i n g l e v e l ( v ) 4 6 8 10 12 1.0 2.0 3.0 4.0 5.0 ?rl = 10 k ? ?f =1 khz ?thd =0.3% fig . 13?quiescent?current?vs.?supply voltage supply?voltage (v) q u i e s c e n t c u r r e n t ( m a ) 4 6 8 10 12 2.0 4.0 8.0 6.0 fig . 14?supply?current?vs. temperature temperature ( ) q u i e s c e n t c u r r e n t ( m a ) 6.5 7.0 7.5 8.0 8.5 9.0 - 60 - 30 0 30 60 90 vs =9v fig . 15?bass?resistance?vs. temperature temperature ( ) b a s s r e s i s t a n c e ( ? ) 40 42 44 46 48 50 - 60 - 30 0 30 60 90 fig . 16?typical?tone?response ?(with?the?ext?components?indicated the?test?circuit ) 10 1 10 2 10 3 10 4 frequency ( hz ) t o n e r e s p o n s e ( d b ) - 15 - 10 0 5 15 -5 10 av =0 db
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?7?of?13 application?notes 1.?i 2 c?bus?interface data?transmission?from?microprocessor?to?the?SC7312?and?viceversa?takes?place?through?the?2?wires?i 2 c?bus interface,? consisting? of? the? two? lines? sda? and? scl(pull-up? resistors? to? positive? supply? voltage? must? be connected). 2.?data?validity ????as?shown?in?figure?17,?the?data?of?the?sda?line?must?be?stable?during?the?high?period?of?the?clock.?the?high and?low?state?of?the?dtat?line?can?only?change?when?the?clock?signal?on?the?scl?line?is?low. fig.?17?data?validity?on?the?i 2 c?bus 3.?start?and?stop?conditions ?????as?shown?in?figure?18,?a?start?condition?is?a?high?to?low?transition?of?the?sda?line?while?scl?is?high.?the stop?condition?is?a?low?to?high?transition?of?the?sda?line?while?scl?is?high. fig.?18?timing?diagram?of?i 2 c?bus 4.?byte?format ?????every?byte?transferred?on?the?sda?line?must?obtain?8?bits.?each?byte?must?be?followed?by?the?an?acknowledge bit.?the?msb?is?transferred?first. 5.?acknowledge ????the? master(microprocessor)? puts? a? resistive? high? level? on? the? sda? line? during? the? acknowledge? clock pulse(see? figure? 19).? the? peripheral(audioprocessor)? that? acknowledges? has? to? pull-down(low)? the? sda? line during?the?acknowledge?clock?pulse,?so?that?the?sda?line?is?stable?low?during?this?clock?pulse. ?????the?audioprocessor?which?has?been?addressed?has?to?generate?an?acknowledge?after?the?reception?of?each byte?,? otherwise?the?sda?line?remain?at?the?high?level?during?the?ninth?clock?pulse?time.? in?this?case?the?master transmitter?can?generate?the?stop?information?in?order?to?abort?the?transfer.
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?8?of?13 fig.?19?acknowledge?on?the?i 2 c?bus 6.?transmission?without?acknowledge ?????avoiding?to?detect?the?acknowledge?of?the?audioprocessor,?the?microprocessor?can?use?a?simpler?transmission: simply?it?waits?one?clock?without?checking?the?slave?acknowledgig,?and?sends?the?new?data. ?????this?approach?of?course?is?less?protected?from?mis-working?and?decreases?the?noise?immunity. software?specification 1. interface?protocol the?interface?protocol?comprises: a?start?conditions a? chip? address? byte,? containing? the? SC7312? address(the? 8 th ? bit? of? the? bytes? must? be? 0).? the? SC7312 must?always?acknowledge?at?the?end?of?each?transmitted?byte. a?sequence?of?data(n-bytes?+?acknowledge) a?stop?condition?(p) 2. chips?address 1?(msb) 0 0 0 1 0 0 0?(lsb) 3. data?bytes msb lsb function 0 0 b2 b1 b0 a2 a1 a0? volume?control 1 1 0 b1 b0 a2 a1 a0? speaker?att?lr 1 1 1 b1 b0 a2 a1 a0? speaker?att?rr 1 0 0 b1 b0 a2 a1 a0? speaker?att?lf 1 0 1 b1 b0 a2 a1 a0? speaker?att?rf 0 1 0 g1 g0 s2 s1 s0? audio?switch 0 1 1 0 c3 c2 c1 c0? bass?control 0 1 1 1 c3 c2 c1 c0? treble?control note:??ax=1.25db?steps;bx=10db?steps;cx=2db?steps;gx=3.75db?steps
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?9?of?13 detailed?description?of?data?bytes 1.?volume msb lsb function 0 0 b2 b1 b0 a2 a1 a0 volume?1.25db?steps 0 0 0 0 0 0 1 -1.25 0 1 0 -2.5 0 1 1 -3.75 1 0 0 -5 1 0 1 -6.25 1 1 0 -7.5 1 1 1 -8.75 0 0 b2 b1 b0 a2 a1 a0 volume?10db?steps 0 0 0 0 0 0 1 -10 0 1 0 -20 0 1 1 -30 1 0 0 -40 1 0 1 -50 1 1 0 -60 1 1 1 -70 ??for?example,?a?volume?of??45db?is?given?by:???00100100 2.?speaker?attenuators msb lsb function 1 0 0 b1 b0 a2 a1 a0? speaker?att?lf 1 0 1 b1 b0 a2 a1 a0? speaker?att?rf 1 1 0 b1 b0 a2 a1 a0? speaker?att?lr 1 1 1 b1 b0 a2 a1 a0? speaker?att?rr 0 0 0 0 0 0 1 -1.25 0 1 0 -2.5 0 1 1 -3.75 1 0 0 -5 1 0 1 -6.25 1 1 0 -7.5 1 1 1 -8.75 0 0 0 0 1 -10 1 0 -20 1 1 -30 1 1 1 1 1 mute for?example,?attenuation?of?25db?on?speaker?rf?is?given?by:??10110100
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?10?of?13 3.audio?switch msb lsb function 0 1 0 g1 g0 s2 s1 s0 audio?switch 0 0 stereo?1 0 1 stereo?2 1 0 stereo?3 1 1 stereo?4 0 loudness?on 1 loudness?off 0 0 +11.25db 0 1 +7.5db 1 0 +3.75db 1 1 0db for?example,?to?select?the?stereo?2?input?with?a?gain?of?+7.5db?loudness?on?the?8bit?string?is:?01001001 4.bass?and?treble msb lsb function 0 1 1 0 c3 c2 c1 c0 bass 0 1 1 1 c3 c2 c1 c0 terble 0 0 0 0 -14 0 0 0 1 -12 0 0 1 0 -10 0 0 1 1 -8 0 1 0 0 -6 0 1 0 1 -4 0 1 1 0 -2 0 1 1 1 0 1 1 1 1 0 1 1 1 0 2 1 1 0 1 4 1 1 0 0 6 1 0 1 1 8 1 0 1 0 10 1 0 0 1 12 1 0 0 0 14 c3=sign for?example,?bass?at??10db?is?obtained?by?the?following?8bit?string?is:?01100010.
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?11?of?13 test?and?typical?application?circuit
SC7312 hangzhou?silan?microelectronics?co.,ltd rev:1.2???????2004.08.03 http:?www.silan.com.cn???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????page?12?of?13 package?outline sop-32-375-1.27 unit:?mm 20 . 98 0. 10 0. 25 0. 05 1. 27 0. 40 2. 54max 0. 15 0. 05 19 . 05 handling?mos?devices: electrostatic?charges?can?exist?in?many?things.?all?of?our?mos?devices?are?internally?protected?against electrostatic?discharge?but?they?can?be?damaged?if?the?following?precautions?are?not?taken: persons?at?a?work?bench?should?be?earthed?via?a?wrist?strap. equipment?cases?should?be?earthed. all?tools?used?during?assembly,?including?soldering?tools?and?solder?baths,?must?be?earthed. mos?devices?should?be?packed?for?dispatch?in?antistatic/conductive?containers.

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