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1 multimedia ics headphone / speaker amplifier for notebook computers BA7786FP-Y / ba7787fs the BA7786FP-Y and ba7787fs are sound amplifiers designed for notebook computers, and contain a suspend function and input pins for the system beep and pm beep sounds used by notebook computers. in short, this single- chip ic contains all the analog audio components needed for notebook computers. applications notebook computers features 1) stereo headphone amplifier that supports mixing input, along with a stereo speaker amplifier (BA7786FP-Y) or btl monaural speaker amplifier (ba7787fs). 2) internal anti-pop circuit, to prevent the popping sounds that occur when the power is turned on and off. 3) internal electronic volume switch and mute circuit. 4) separate suspend modes for the headphone amplifi- er and speaker amplifier, for low-power-consumption computers . 5) two beep input pins, a necessity for notebook com- puters. absolute maximum ratings (ta = 25?) recommended operating conditions (ta = 25?) parameter symbol limits unit power supply voltage v cc v 6 power dissipation mw 850 * 1 pd 600 * 2 operating temperature topr tstg c c ?10 ~ + 70 storage temperature ?55 ~ + 125 BA7786FP-Y ba7787fs * 1 reduced by 6.8mw for each increase in ta of 1 c over 25 c. * 2 reduced by 6.0mw for each increase in ta of 1 c over 25 c. parameter symbol typ. unit power supply voltage v cc v min. max. 4.5 5.0 5.5 product s.p.amp other functions BA7786FP-Y ba7787fs h.p.amp stereo stereo stereo monaural system / pm beep input, suspend, evr, mute, beep level control
2 multimedia ics BA7786FP-Y / ba7787fs block diagram hp suspend sp suspend hp v cc sp v cc hp v cc hp out r hp gnd sp in l sp in r hp out l sp v cc line mix on / off sp out1 r sp out2 r mono / st sp gnd evr ctrl line in l mute ctrl line in r bias system beep in lch out beep level pm beep in sp out1 l sp out2 l hp suspend sp suspend 1 2 3 4 5 6 7 8 9 10111213 14 15 16 17 18 19 20 21 22 23 24 25 vr vr BA7786FP-Y pin descriptions pin no. pin name function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 evr ctrl evr control pin 25 voltage type b (npn) line in l line lch input 2.5 b (pnp) mute ctrl headphone mute control pin 5.0 100k w pull up line in r line rch input 2.5 b (pnp) bias bias 2.5 23.5k w system beep in system beep input 2.5 b (npn) beep level system beep in output level setting 4.2 c (pnp) ~ 3k w lch out line in l + system beep in output c (pnp) pm beep in pm beep input 2.5 b (npn) sp out1 l btl speaker lch output (forward) 2.5 ef (npn) sp out2 l btl speaker lch output (reverse) 2.5 ef (npn) hp suspend headphone suspend control 5.0 100k w pull up sp suspend speaker suspend control 5.0 100k w pull up sp gnd speaker ground 0.0 mono / st speaker amplifier lch on / off control 5.0 100k w pull up sp out2 r btl speaker rch output (reverse) ef (npn) sp out1 r btl speaker rch output (forward) 2.5 ef (npn) line mix on / off sp in l / r input on / off control 5.0 100k w pull up sp v cc speaker vcc 5.0 sp in r speaker rch input 2.5 b (npn) sp in l speaker lch input 2.5 b (npn) hp gnd headphone ground 0.0 hp out r headphone rch output 2.5 ef (npn) hp out l headphone lch output 2.5 ef (npn) hp v cc headphone vcc 5.0 2.5 note) the pin formats are as follows. ef: emitter follower; b: base; c: collector; ~ : series connection. the above values are all based on the settings (hp v cc = sp v cc = + 5.0v) in fig. 1, entitled "measurement circuit diagram," and do not guarantee standards. BA7786FP-Y
3 multimedia ics BA7786FP-Y / ba7787fs block diagram 20 19 18 17 16 15 11 1 2 3 4 5 6 9 10 hp v cc hp v cc hp out r hp gnd sp v cc beep level hp out l sp gnd evr ctrl line in l mute ctrl line in r bias system beep in sp suspend hp suspend 14 sp out1 13 sp out2 12 line mix on / off 7 sp in 8 pm beep in sp v cc hp suspend sp suspend vr vr ba7787fs 1 evr ctrl evr control pin 2 line in l line lch input b (pnp) b (pnp) 23.5k w b (npn) b (npn) b (npn) b (pnp) b (pnp) ef (npn) ef (npn) ef (npn) ef (npn) b (npn) 3 mute ctrl headphone mute control 100k w pull up 4 line in r line rch input 5 bias bias 6 system beep in system beep input 7 sp in speaker input 8 pm beep in pm beep input 9 hp suspend headphone suspend control 10 sp suspend speaker suspend control 11 sp gnd speaker ground 12 line mix on / off sp in input on / off control 100k w pull up c (pnp) ~ 3k w 13 sp out2 btl speaker output (reverse) 14 sp out1 btl speaker output (forward) 15 beep level 16 sp v cc speaker vcc 17 hp gnd headphone ground 18 hp out r headphone rch output 19 hp out l headphone lch output 20 hp v cc headphone vcc system beep in output level setting pin no. pin name function pin voltage pin type 2.5 5.0 2.5 2.5 2.5 2.5 2.5 0.0 5.0 2.5 2.5 4.2 5.0 0.0 2.5 2.5 5.0 note) the pin formats are as follows. ef: emitter follower, b: base, c: collector, ~ : series connection. the above values are all based on the settings (hp v cc = sp v cc = + 5.0v) in fig. 2, entitled "measurement circuit diagram," and do not guarantee standards. ba7787fs
4 multimedia ics BA7786FP-Y / ba7787fs control pin circuits 100k 3,15pin 10k hp v cc BA7786FP-Y mute ctrl (3pin) mono / st (15pin) 100k 12,13pin 10k hp v cc hp suspend (12pin) sp suspend (12pin) 20k 100k 18pin hp v cc line mix on / off (18pin) 100k 3pin 10k hp v cc ba7787fs mute ctrl (3pin) note) all figures are design values, and do not represent guaranteed performance. 10k 9,10pin hp v cc hp suspend (9pin) sp suspend (10pin) 20k 100k 12pin hp v cc line mix on / off (12pin)
5 multimedia ics BA7786FP-Y / ba7787fs parameter symbol unit conditions min. typ. max. supply current ? supply current supply current suspend output voltage level maximum output level output residual noise interchannel crosstalk muting level output voltage level input threshold level output voltage level distortion maximum output level output residual noise interchannel crosstalk line mix off level output level mute ctrl ? (pin 13) hp mute on holding voltage hp mute off holding voltage hp suspend ? (pin 12) hp suspend holding voltage hp suspend holding voltage sp suspend ? (pin 13) hp suspend holding voltage hp suspend holding voltage mono / stereo ? (pin 15) monaural holding voltage stereo holding voltage line mix on / off ? (pin 18) line mix off holding voltage line mix on holding voltage evr variation range distortion measurement circuit 3.52 4.82 7.64 no input, sp out = no load fig.1 i cc ma 175 240 410 no input, v h = v s = h fig.1 i ccs m a hp amp 1 ? input: line in l / r, output: hp out l / r hp amp 2 ? input: system beep in, output: hp out l / r sp amp 2 ? input: pm beep in, output: sp out l / r ?7.4 ?4.0 ?1.5 v in = ?10.0dbv v in = ?10.0dbv * 1 v in = ?10.0dbv * 2 v e = hp v cc ? v e = ground level differential fig.1 v ohp dbv 0.1 1.0 fig.1 thd hp % ?1.6 + 0.6 thd = 1% * 1 fig.1 v omhp dbv dbv dbv dbv v p-p v p-p dbv 70 90 fig.1 g evr db 80 ?73 r g = 1k w * 2 v in = ?7.0dbv * 2 v in = ?7.0dbv * 2 , v m = l v in = ?10.0dbv v in = ?10.0dbv * 1 v in = ?12.0dbv * 2 v in = ?12.0dbv * 2 , v l = l v in = ?10.0dbv fig.1 v onhp 79 ?70 fig.1 ct hp 94 ?83 fig.1 mt hp 0.22 0.32 0.42 v in = 5.0v p-p fig.1 4.5 5.0 fig.1 v hbh v osp thd sp v ohb ?1.4 + 2.0 + 4.5 fig.1 0.4 1.5 fig.1 % + 3.5 + 5.7 thd = 1% * 1 fig.1 v omsp dbv 90 ?80 r g = 1k w * 2 fig.1 v onsp dbv dbv dbv dbv 78 ?70 fig.1 ct sp 78 ?70 fig.1 v ooffsp ?7.4 ?4.0 ?1.5 fig.1 fig.1 fig.1 v osb gnd 0.4 v ml v 4.3 v cc v mh v gnd 0.4 fig.1 v hl v 4.3 v cc fig.1 v hh v 4.3 v cc fig.1 v sh v gnd 0.4 fig.1 v sl v 4.3 v cc fig.1 v nh v gnd 0.4 fig.1 v nl v gnd 0.4 fig.1 v ll v 4.3 v cc fig.1 v lh v sp amp 1 ? input: sp in l / r, output: sp out l / r * 1 : b.w. = 0.4 ~ 30khz * 2 : din audio mode settings are as follows, unless otherwise noted: v e = hp v cc (evr = max.), v m = h (hp mute off), v h = l (hp suspend), v s = l (sp suspend), v l = h (line mix on), v n = h (stereo) BA7786FP-Y electrical characteristics (unless otherwise noted, ta = 25?, hp v cc = sp v cc = 5.0v, f = 1khz)
6 multimedia ics BA7786FP-Y / ba7787fs parameter symbol unit conditions min. typ. max. supply current ? supply current supply current suspend output voltage level maximum output level output residual noise interchannel crosstalk muting level output voltage level input threshold level output voltage level distortion maximum output level output residual noise interchannel crosstalk line mix off level output level mute ctrl ? (pin 3) hp mute on holding voltage hp mute off holding voltage hp suspend ? (pin 9) hp suspend holding voltage hp suspend holding voltage sp suspend ? (pin 10) sp suspend holding voltage sp suspend holding voltage line mix on / off ? (pin 12) line mix off holding voltage line mix on holding voltage evr variation range distortion measurement circuit 3.10 4.25 6.74 no input, sp out = no load fig.2 i cc ma 175 240 410 no input, v h = v s = h fig.2 i ccs m a hp amp 1 ? input: line in l / r, output: hp out l / r hp amp 2 ? input: system beep in, output: hp out l / r sp amp 2 ? input: pm beep in, output: sp out l / r ?7.4 ?4.0 ?1.5 v in = ?10.0dbv v in = ?10.0dbv * 1 v in = ?10.0dbv * 2 v e = hp v cc ? v e = ground level differential fig.2 v ohp dbv 0.1 1.0 fig.2 thd hp % ?1.6 + 0.6 thd = 1% * 1 fig.2 v omhp dbv dbv dbv dbv v p-p v p-p dbv 70 90 fig.2 g evr db 80 ?73 r g = 1k w * 2 v in = ?7.0dbv * 2 v in = ?7.0dbv * 2 , v m = l v in = ?10.0dbv v in = ?10.0dbv * 1 v in = ?12.0dbv * 2 v in = ?12.0dbv * 2 , v l = l v in = ?10.0dbv fig.2 v onhp 79 ?70 fig.2 ct hp 94 ?83 fig.2 mt hp 0.22 0.32 0.42 v in = 5.0v p-p fig.2 4.5 5.0 fig.2 v hbh v osp thd sp v ohb ?1.4 + 2.0 + 4.5 fig.2 0.4 1.5 fig.2 % + 3.5 + 5.7 thd = 1% * 1 fig.2 v omsp dbv 90 ?80 r g = 1k w * 2 fig.2 v onsp dbv dbv dbv dbv 78 ?70 fig.2 ct sp 78 ?70 fig.2 v ooffsp ?7.4 ?4.0 ?1.5 fig.2 fig.2 fig.2 v osb gnd 0.4 v ml v 4.3 v cc v mh v gnd 0.4 fig.2 v hl v 4.3 v cc fig.2 v hh v 4.3 v cc fig.2 v sh v gnd 0.4 fig.2 v sl v gnd 0.4 fig.2 v ll v 4.3 v cc fig.2 v lh v sp amp 1 ? input: sp in l / r, output: sp out l / r * 1 : b.w. = 0.4 ~ 30khz * 2 : din audio mode settings are as follows, unless otherwise noted: v e = hp v cc (evr = max.), v m = h (hp mute off), v h = l (hp suspend), v s = l (sp suspend), v l = h (line mix on), v n = h (stereo) ba7787fs control threshold voltage ?
7 multimedia ics BA7786FP-Y / ba7787fs 1 25 24 23 21 20 19 18 17 16 15 14 2 3 456 8 7 9 10 11 12 13 22 vr hp suspend 27k 27k 27k 18k 8 33k 390k 0.47 m 47 m 47 m 100 100 8 1k 15k 15k 1k 0.47 m 0.47 m 0.47 m 0.47 m 0.47 m 22 m 1 m 1k 1k 1k 1k sp suspend vr BA7786FP-Y hp v cc sp v cc hp out r hp gnd sp in l sp in r hp out l sp out r sp gnd line in l line in r system beep in lch out pm beep in sp out l hp v cc sp v cc v l v e v m v h v s v n fig. 1 + + + + + + measurement circuit
8 multimedia ics BA7786FP-Y / ba7787fs 1 20 19 18 16 15 14 13 12 11 2 34 56 8 7 9 10 17 vr hp suspend v e v l 27k 27k 33k 0.47 m 47 m 47 m 100 100 8 390k 0.47 m 0.47 m 22 m 1k 1k 1k v m v h v s sp suspend 15k 0.47 m 1k 18k 0.47 m 1k vr ba7787fs hp v cc hp v cc hp out r hp gnd sp v cc hp out l sp gnd line in l line in r system beep in sp out sp in pm beep in sp v cc fig. 2 + + + + +
9 multimedia ics BA7786FP-Y / ba7787fs circuit operation (1) gain between line in l / line in r and hp out l / hp out r g hp , the gain when evr is at its maximum (v e = hp v cc ), is calculated as follows: (2) output level between system beep in and hp out l / hp out r inputting a pulse wave to system beep in causes hp out l and hp out r to output a pulse wave. the out- put level of this pulse wave depends on the resistance between pin 7 and gnd. the level when evr is at its maximum (v e = hp v cc ) is calculated as follows. (4) gain between pm beep in and sp out 1 / sp out 2 this is calculated as follows. (BA7786FP-Y only, ba7787fs: pin 8) this path is output regardless of whether lin mix on / off is at the high or low level. (3) gain between sp in l / sp in r and sp out l / sp out r (BA7786FP-Y) this is calculated as follows. this path is not controlled by evr or the mute function. (5) gain between line in l and lch out (BA7786FP-Y) this gain (g hl ) is calculated as follows. set so that 12k % r % 56k. this gain attenuates accord- ing to the pin 1 dc voltage (v e ) (see fig. 8). mixing input can be accommodated by attaching multiple resis- tors. gain between sp in and sp out 1 / sp out 2 (ba7787fs) this is calculated as follows. set so that r ^ 100k (v hb % 1.1v). as with the path be- tween line in l / line in r and hp out l / hp out r, this level attenuates according to the pin 1 dc volt- age. (BA7786FP-Y only, ba7787fs: pin 15) 2 r 4 r 20 21 r r 7 r 9 r 7 r g hp 6 20 * log (db) 60k 1k + r g sp 6 20 * log (db) 32k 1k + r g sp 6 20 * log (db) 32k 1k + r g sb 6 20 * log (db) 20k 1k + r g hl 6 20 * log (db) r8 2 * r2 v hb 6 0.5 * * 60k (v p-p ) v cc ?0.7 13k + r 2 r8 8 r2
10 multimedia ics BA7786FP-Y / ba7787fs (6) output level between system beep in and lch out (BA7786FP-Y) inputting a pulse wave to system beep in causes lch out to output a pulse wave. the output level of this pulse wave depends on the resistance between pin 7 and gnd and between pin 8 and gnd, and is calcu- lated as follows. (7) evr control characteristics the headphone amplifier is controlled by changing the resistive potential division ratio. this path is not controlled by evr or the mute function. 8 7 r7 r8 v hs 6 0.25 * * r8 (v p-p ) v cc ?0.7 13k + r7
11 multimedia ics BA7786FP-Y / ba7787fs control pins (1) mute ctrl ?turns the headphone mute function on and off. (3) sp suspend ?turns the speaker suspend function on and off. (2) hp suspend ?turns the headphone suspend function on and off. ?because the BA7786FP-Y has a pull-up resistor, this is possible even when open (if at the high level). ?because the BA7786FP-Y has a pull-up resistor, this is possible even when open (if at the high level). control signal: v m note hp mute on l turns off hp amp output hp mute off h (open) control signal: v h note hp suspend l h the headphone amplifier operates the headphone amplifier turns off hp suspend control signal: v s note sp suspend l h the speaker amplifier operates the speaker amplifier turns off sp suspend (4) line mix on / off ?turns the sp in input on and off according to sp out. control signal: v l note line mix off l h (open) stops the output of sp in input to sp out line mix on (5) mono / stereo (BA7786FP-Y) ?turns sp amp lch on and off. control signal: v n note sp amp lch off l h (open) sp amp lch turns off sp amp lch on sp amp lch operates
12 multimedia ics BA7786FP-Y / ba7787fs hp suspend sp suspend hp v cc sp v cc hp v cc sp v cc hp gnd sp sp mono / st evr ctrl beep level line in l mute ctrl line in r bias system beep in lch out pm beep in hp suspend sp suspend sp gnd 1 2 3 4 5 6 8 9 10 11 12 19 18 17 16 15 14 25 24 23 22 21 20 7 100 27k * vr v cc hp jack 15k 15k 100 27k * 33k 390k 27k 8 w * 8 w * is for mixing input. fig. 3 13 vr vr + + + + + application example BA7786FP-Y pin no. terminal name function l h terminal form 3 12 13 15 18 mute ctrl hp suspend sp suspend mono / st line mix on / off hp mute on hp operated sp operated lch sp off line mix off hp mute off hp suspended lch sp on line mix on sp suspended 100k pull up 100k pull up 100k pull up 100k pull up 100k pull up
13 multimedia ics BA7786FP-Y / ba7787fs hp v cc sp v cc hp suspend sp suspend 1 2 3 4 5 20 19 18 17 16 6 7 8 9 10 15 14 13 12 11 hp v cc hp gnd sp v cc 100 hp jack 100 390k 8 w sp sp gnd evr ctrl mute ctrl line in r line in l system beep in 27k 27k 15k 18k 15k 33k vr v cc pm beep in hp suspend sp suspend bias * is for mixing input fig. 4 vr vr * * * + + + + + ba7787fs pin no. terminal name function l h terminal form 3 9 10 12 mute ctrl hp suspend sp suspend line mix on / off hp mute on hp operated sp operated line mix off hp mute off hp suspended line mix on sp suspended 100k pull up pnp base pnp base 100k pull up
14 multimedia ics BA7786FP-Y / ba7787fs input: line in l output: hp out l v in = ?30dbv hp v cc = 5.0v sp v cc = 5.0v v e = 5.0v 100 100k 10k 1k 1m 10m ?20 output level: v o (dbv) phase (deg) frequency: f (hz) ?30 ?40 ?50 ?60 ?70 ?80 ?90 ?100 ?180 + 180 fig. 5 hp amp frequency characteristics electrical characteristic curves input: line in l output: hp out l f = 1khz hp v cc = 5.0v sp v cc = 5.0v v e = 5.0v b.w. = 0.4 ~ 30khz r l = 100 w r l = ?40 ?10 ?20 ?30 0 output distortion: thd (%) input level: v in (dbv) 10 1 0.1 0.01 fig. 6 hp amp input level vs. output distortion input: line in l output: hp out l v in = ?6.4dbv hp v cc = 5.0v sp v cc = 5.0v v e = 5.0v din audio v m = gnd v m = 5.0v 10 1k 100 10k 100k 10 0 output level: v o (dbv) frequency: f (hz) ?10 ?20 ?30 ?40 ?50 ?60 ?70 ?90 ?80 ?100 fig. 7 hp amp mute characteirstics input: line in l output: hp out l v in = ?10dbv, f = 1khz hp v cc = 5.0v sp v cc = 5.0v din audio 0 0.5 1.0 0 output level: v o (dbv) voltage ratio: v e / v cc ?50 ?100 fig. 8 hp amp evr characteristics input: line in l output: hp out l v in = 5.0vpp, f = 10khz hp v cc = 5.0v sp v cc = 5.0v v e = 5.0v 10k 100k 1m output level: v o (vpp) ba7787fs: 15pin BA7786FP-Y: 7pin resistor: r ( w ) 1.0 0.1 fig. 9 system beep output level vs. external resistor. input: sp in output: sp out 1 v in = ?30dbv hp v cc = 5.0v sp v cc = 5.0v 100 100k 10k 1k 1m 10m ?20 output level: v o (dbv) frequency: f (hz) ?100 fig.10 sp amp frequency characteristics input: sp in output: sp out 1 / 2, f = 1khz hp v cc = 5.0v, sp v cc = 5.0v v e = 5.0v, b.w. = 0.4 ~ 30khz r l = r l = 8 w ?50 ?10 ?20 ?30 ?40 0 output distortion: thd (%) input level: v in (dbv) 10 1 0.1 0.01 fig. 11 sp amp input level vs. output distortion r l = speaker (8 w ) input: sp in output: sp out 1 / 2 v in = 11.6dbv hp v cc = 5.0v sp v cc = 5.0v din audio 10 1k 100 10k 100k 10 0 output level: v o (dbv) frequency: f (hz) ?10 ?20 ?30 ?40 ?60 ?50 ?70 ?80 ?90 ?100 fig. 12 sp amp mute characteristics v l = gnd v l = 5.0v
15 multimedia ics BA7786FP-Y / ba7787fs hp suspend sp suspend hp v cc sp v cc hp v cc sp v cc hp gnd line in l mute line in r bias system beep in lch out beep level pm beep in sp out1 l sp out2 l hp sus sp sus hp v cc lch on / off mix on / off sp gnd 1 2 3 4 5 6 8 9 10 11 12 19 18 17 16 15 14 25 24 23 22 21 20 7 r17 r14 r15 100 100 m 47 m 47 m c11 c1 0.1 m 0.1 m c2 c4 0.1 m c5 0.1 m c6 0.1 m 47 m c3 c10 c9 c14 c13 c12 c7 c8 0.1 m 100 m 0.1 m 1 2 3 0.1 m 0.1 m 27k vr1 r1 r2 r3 r4 r5 r6 r7 r8 r9 v cc hp jack hp out l hp gnd hp out r hp gnd 15k r16 15k 100 27k 33k 390k r10 18k 18k 27k r11 r13 sp out1 r sp out2 r fig. 13 13 vr vr + + + + + board circuit BA7786FP-Y
16 multimedia ics BA7786FP-Y / ba7787fs hp v cc sp v cc 1 2 3 4 5 20 19 18 17 16 6 7 8 9 10 15 14 13 12 11 sp v cc beep level hp gnd hp v cc hp v cc hp gnd hp gnd hp out l hp out r hp gnd gnd r15 100 r14 100 c12 c10 c11 c1 c3 c7 c8 47 m 47 m 47 m c9 100 m 0.1 m 0.1 m 0.1 m 0.1 m c2 0.1 m c4 c5 c6 0.1 m 100 m 0.1 m hp jack r13 390k sp gnd line in l 27k 27k 15k 18k 15k 33k vr1 bias sp gnd sp out1 sp out2 1 2 3 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 gnd line in r gnd gnd system beep in pm beep in mute hp sus sp sus mix on / off fig. 14 hp suspend sp suspend vr vr + + + + + ba7787fs
17 multimedia ics BA7786FP-Y / ba7787fs no. use standard value r1 used to set the gain from line in l / line in r (pins 2 and 4) to hp out l / hp out r (pins 24 and 23) 27k w r2 (see section 1, on circuit operation for the formula.) 27k w r3 a wide range of mixing ratios can be set by changing the values of 27k w r4 r1, r2 and r3 (or r4, r5 and r6). 27k w r5 27k w r6 27k w r7 33k w r8 33k w r9 33k w r10 used to set the output level from system beep in (pin 6) to hp out l / hp out r (pins 24 and 23). (see section 2, on circuit operation for the formula.) 390k w r11 ?no need to attach. connect pin 8 to a ground. r13 ?used to set the gain from pm been in (pin 9) to sp out l / sp out r (pins 10, 11, 16 and 17). (see section 4, on circuit operation for the formula.) 18k w r14 r15 ?the load resistor for hp out r. 100 w ?the load resistor for hp out l. 100 w used to set the gain from sp in l / r (pins 21 and 20) to sp out l / r (pins 10, 11, 16 and 17). (see section 3, on circuit operation for the formula.) 15k w r17 r16 15k w c1 ?the coupling capacitor for line in l 0.1 m f c2 ?the coupling capacitor for line in r 0.1 m f c3 ?the ripple rejection capacitor for the bias pin 47 m f c4 ?the coupling capacitor for system beep in 0.1 m f c5 ?no need to attach c6 ?the coupling capacitor for pm beep in 0.1 m f c7 ?the bypass capacitor for sp v cc (used for low-frequency ripple rejection) 100 m f c8 ?the bypass capacitor for sp v cc (used for high-frequency ripple rejection) 0.1 m f c9 ?the coupling capacitor for hp out r 47 m f c10 ?the coupling capacitor for hp out l 47 m f c11 ?the bypass capacitor for hp v cc (used for low-frequency ripple rejection) 100 m f c12 ?the bypass capacitor for hp v cc (used for high-frequency ripple rejection) 0.1 m f c13 ?the coupling capacitor for sp in r 0.1 m f c14 ?the coupling capacitor for sp in l 0.1 m f vr1 ?used to change the pin 1 dc voltage 20k w BA7786FP-Y resistors for mixing system beep in (pin 6). because the threshold voltage between the high and low levels is fixed inside the ic, these resistors should be set to 33k w part table
18 multimedia ics BA7786FP-Y / ba7787fs no. use standard value r1 used to set the gain from line in l / line in r (pins 2 and 4) to hp out l / hp out r (pins 19 and 18) (see section 1, on circuit operation for the formula.) 27k w r2 27k w r3 a wide range of mixing ratios can be set by changing the values of r1, r2 and r3 (or r4, r5 and r6). 27k w r4 27k w r5 27k w r6 27k w r7 33k w r8 33k w r9 33k w r10 ?used to set the gain from sp in (pin 7) to sp out 1 / sp out 2 (pins 14 and 13). (see section 3, on circuit operation for the formula.) ?used to set the output level from system beep in (pin 6) to hp out l / hp out r (pins 19 and 18). (see section 2, on circuit operation for the formula.) 15k w 15k w 18k w 390k w r12 r11 r13 ?used to set the gain from pm beep in (pin 8) to sp out 1 / sp out 2 (pins 14 and 13). r14 ?the load resistor for hp out r. 100 w ?the load resistor for hp out l. 100 w r15 20k w c1 ?the coupling capacitor for line in l 0.1 m f c2 ?the coupling capacitor for line in r 0.1 m f c3 ?the ripple rejection capacitor for the bias pin 47 m f c4 ?the coupling capacitor for system beep in 0.1 m f c5 0.1 m f c6 ?the coupling capacitor for pm beep in ?the coupling capacitor for sp in 0.1 m f c7 ?the bypass capacitor for sp v cc (used for low-frequency ripple rejection) 100 m f c8 ?the bypass capacitor for sp v cc (used for high-frequency ripple rejection) 0.1 m f 0.1 m f c9 ?the coupling capacitor for hp out r 47 m f c10 ?the coupling capacitor for hp out l 47 m f c11 c12 vr1 ?the bypass capacitor for hp v cc (used for low-frequency ripple rejection) ?the bypass capacitor for hp v cc (used for high-frequency ripple rejection) ?used to change the pin 1 dc voltage 100 m f ba7787fs (see section 4, on circuit operation for the formula.) resistors for mixing system beep in (pin 6). because the threshold voltage between the high and low levels is fixed inside the ic, these resistors should be set to 33k w .
19 multimedia ics BA7786FP-Y / ba7787fs operation notes (1) popping noises occurring when the power is turned on ?when the power is turned on, the headphone mute function should be on and the suspend function off in order to prevent popping noises from occurring when v cc turns on. (2) the supply voltages for hp v cc and sp v cc should come from the same power supply. using separate power supplies can lead to output voltage drops and malfunctioning. (3) the common impedance of the two power supply lines (hp v cc and sp v cc ) should be kept as low as possible. (4) make sure the input resistance for the system beep in pin is 33k w . (5) configure the pm beep in pin of BA7786FP-Y as shown below in order to prevent oscillation in the ic. (6) the lch out pin (pin 8) of BA7786FP-Y should be grounded when not used. (7) when switching the suspend function popping nois- es may occur. if this bothers, take measures for elimi- nating it by attachig external componets. 33k
20 multimedia ics BA7786FP-Y / ba7787fs mix lch on / off sp sus hp sus mute sp out1 l sp out2 l on / off j11 j12 j1 j2 j3 j4 j10 j9 j8 j5 g pm beep in g system beep in gnd line in r gnd line in l 1 3 2 sp out2 r sp out1 r sp gnd sp v cc lch out g r13 r11 r12 r10 r9 r8 r7 r6 r5 r4 r1 r2 r3 c1 c2 c3 c11 c12 vr1 r15 r14 c10 c9 14 25 13 1 c8 c7 c5 c14 c13 c6 c4 r17 r16 j6 j7 hp v cc hp gnd hp r gnd hp out r hp out l hp l gnd to headphone jack apb-BA7786FP-Y fig. 15 board labelling diagram BA7786FP-Y line in l: line input lch line in r: line input rch system beep in: system beep sound input pm beep in: pm beep sound input hp out l: headphone output lch monitor hp out r: headphone output rch monitor sp out l 1 / 2: speaker connection pin (btl) sp out r 1 / 2: speaker connection pin (btl) sp v cc : supply voltage input + 5.0v hp v cc : supply voltage input + 5.0v vr1: electric volume adjuster va (on this board, g hp is set to its maximum by turning the volume adjuster clockwise as far as it will go.) mute: mute control switch hp sus: hp suspend control switch sp sus: sp suspend control switch mix on / off: line mix on / off switch (on this board, pin 12 automatically drops to the ground level when a headphone is plugged into the jack.) lch on / off: sp amp lch on / off switch
21 multimedia ics BA7786FP-Y / ba7787fs fig. 16 board pattern diagram BA7786FP-Y
22 multimedia ics BA7786FP-Y / ba7787fs mix sp sus hp sus mute on / off j1 j2 j3 j4 j8 j5 g pm beep in g system beep in gnd line in r gnd line in l 1 3 2 sp out2 sp out1 sp gnd sp v cc r9 r8 r7 r6 r5 r4 r3 c11 c12 vr1 r15 r14 c10 11 20 10 1 c8 c7 r13 c6 hp v cc hp gnd hp r gnd hp out r hp out l hp l gnd to headphone jack c9 r12 j7 j6 c5 c4 c3 c2 c1 apb-ba7787fs r2 r1 r10 r11 fig. 17 board labelling diagram ba7787fs line in l: line input lch line in r: line input rch system beep in: system beep sound input pm beep in: pm beep sound input hp out l: headphone output lch monitor hp out r: headphone output rch monitor sp out 1: speaker connection pin (btl) sp out 2: speaker connection pin (btl) sp v cc : supply voltage input + 5.0v hp v cc : supply voltage input + 5.0v vr1: electric volume adjuster va (on this board, g hp is set to its maximum by turning the volume adjuster clockwise as far as it will go.) mute: mute control switch hp sus: hp suspend control switch sp sus: sp suspend control switch mix on / off: line mix on / off switch (on this board, pin 12 automatically drops to the ground level when a headphone is plugged into the jack.)
23 multimedia ics BA7786FP-Y / ba7787fs fig. 18 board pattern diagram ba7787fs
24 multimedia ics BA7786FP-Y / ba7787fs hsop25 BA7786FP-Y ba7787fs ssop-a20 7.8 0.3 5.4 0.2 2.75 0.1 1.95 0.1 25 14 1 13 0.11 1.9 0.1 0.36 0.1 0.3min. 0.25 0.1 13.6 0.2 0.8 0.15 11 10 20 1 0.11 7.8 0.3 5.4 0.2 8.7 0.2 0.15 0.1 0.36 0.1 0.8 1.8 0.1 0.3min. 0.15 external dimensions (units: mm)

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