1/4 rev. a structure : silicon monolithic integrated circuit product : sound processor for car audio type: BD37515FS package: ssop-a20 feature 1. reduce switching noise of input gain control, mute, main volume, fader volume, bass, treble, loudness by using advanced switch circuit [possible to control all steps] 2. built-in ground isolation amplifier inputs, ideal for external stereo input. 3. built-in input gain controller reduce switch ing noise for volume of a portable audio input. 4. decrease the number of external components by built-in 2-band equalizer filter, lpf for subwoofer, loudness filter. and, possible to control q, gv, fo of 2-band equal izer and fc of lpf,and gv of loudness by i 2 c bus control freely. 5. it is possible for the bass, trebl e to the gain adjustment quantity of 20db and 1 db step gain adjustment. 6. bi-cmos process is suitable for the design of low curr ent and low energy. and it provides more quality for small scale regulator and heat in a set. 7. package is ssop-a20. putting input-terminals together and output-terminals together can make pcb layout easier and can makes area of pcb smaller.) 8. it is possible to control by 3.3v / 5v for i 2 c bus. absolute maximum ratings (ta=25 ) paramete r symbol limits unit power supply voltage vcc 10.0 v input voltage vin vcc+0.3 gnd-0.3 v power dissipation pd 940 1m w storage temperature tastg -55 +150 1 at ta 25c or higher, this value is decreaced to 7.5mw/c when rohm standard board is mounted. rohm standard board: size 70 701.6(mm 3 ) material fr4 glass-epoxy substrate (copper foil area: not more than 3%). operating range design against radiation-proof isn?t made. parameter symbol min. typ. max. unit power supply voltage vcc 7.0 9.5 v temperature topr -40 +85
2/4 rev. a function function specifications input selector stereo 3 single-end input and 1differential input input gain 0 20db (1db step), possible to use ?advanced switch? for prevention of switching noise mute possible to use ?advanced switch? for prevention of switching noise. volume +15db - 79db (1db step), -db possible to use ?advanced switch? for prevention of switching noise. bass -20 +20db (1db step), q=0.5, 1, 1. 5, 2, fo=60, 80, 100, 120hz possible to use advanced switch at changing gain treble -20 +20db (1db step), q=0.75, 1.25 fo=7.5k, 10k, 12.5k, 15khz , possible to use advanced switch at changing gain fader +15db - 79db (1db step), -db possible to use ?advanced switch? for prevention of switching noise. loudness 0db 20db (1db step), fo=800hz possible to use ?advanced switch? for prevention of switching noise. lpf fc=55/85/120/160hz, pass phase shift ( 0/180) electrical characteristic (unless specified particularly, ta=25 , vcc=8.5v, f=1khz, vin=1vrms, rg=600 , r l =10k , a input, input gain 0db, mute off, volume 0db, tone control 0db, loudness 0db, fader 0db, lpf off) item symbol limit unit condition min. typ. max. current upon no signal i q 38 48 ma no signal voltage gain g v -1.5 0 1.5 db gv=20log(vout/vin) channel balance cb -1.5 0 1.5 db cb = gv1-gv2 total harmonic distortion 1 (front,rear) thd+n1 0.001 0.05 vout=1vrms bw=400-30khz total harmonic distortion 2 (subwoofer) thd+n2 0.002 0.05 vout=1vrms bw=400-30khz output noise voltage 1 (front,rear) v no1 3.8 15 vrms rg = 0 bw = ihf-a output noise voltage 2 (subwoofer) v no2 4.8 15 vrms rg = 0 bw = ihf-a residual output noise voltage v nor 1.8 10 vrms fader= - db rg=0 bw=ihf-a cross-talk between channels ctc -100 -90 db rg=0 ctc=20log(vout/vin) bw=ihf-a ripple rejection rr -70 -40 db f=100hz vrr=100mvrms rr=20lo g( vout/vccin ) common mode rejection ratio cmrr 50 65 db dp1 and dn input dp2 and dn input cmrr=20log(vin/vout) bw = ihf-a maximum input voltage v im 2.1 2.3 vrms vim at thd+n(vout)=1% bw=400-30khz maximum gain g v max 13 15 17 db volume = 15db vin=100mvrms gv=20lo g( vout/vin ) maximum attenuation g v min -100 -85 db volume= - db gf=20log(vout/vin) bw=ihf-a maximum output voltage v om 2.0 2.2 vrms thd+n=1% bw=400-30khz
3/4 rev. a dimensional outline drawing block diagram descriptions of terminal ssop-a20 (unit mm) terminal no. terminal name 1 fil 2 a1 3 a2 4 b1 5 b2 6 c1 7 c2 8 dp1 9 dn 10 dp2 11 mute 12 outs 13 outr2 14 outr1 15 outf2 16 outf1 17 vcc 18 scl 19 sda 20 gnd max9.05(include.burr) bufferd gnd iso amp input selector (3 single-end and 1 stereo iso) volume/mute 2 band p-eq (tone control) loudness i 2 c bus logic gnd vcc/2 input gain 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 fader fader fader fader vcc lpf fader bufferd gnd iso amp BD37515FS lot no.
4/4 rev. a cautions on use (1) absolute maximum ratings if applied voltage, operating temperatur e range, or other absolute maximum ratings are exceeded, the lsi may be damaged. do not apply voltages or temperatures that exc eed the absolute maximum ratings. if you think of a case in which absolute maximum ratings are exceed ed, enforce fuses or other physical safety measures and investigate how not to apply the conditions under which absolute maximum ratings are exceeded to the lsi. (2) gnd potential make the gnd pin voltage such that it is the lowest voltage even when oper ating below it. actually confirm that the voltage of each pin does not become a lower voltage than the gnd pin, including transient phenomena. (3) thermal design perform thermal design in which there are adequate ma rgins by taking into account the allowable power dissipation in actual states of use. (4) shorts between pins and misinstallation when mounting the lsi on a board, pa y adequate attention to orientation and placement discrepancies of the lsi. if it is misinstalled and the power is turned on, the lsi may be damaged. it also may be damaged if it is shorted by a foreign substance coming between pins of the lsi or between a pin and a power supply or a pin and a gnd. (5) operation in strong magnetic fields adequately evaluate use in a strong magnetic field, since there is a possibility of malfunction.
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