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utc BA3308 linear integrated ci rcuit utc unisonic technologies co., ltd. 1 www.unisonic.com.tw qw-r107-015,a dual preamplifier with alc description the utc BA3308 is designed to have dual preamplifier ics with built ? in alc circuits for use in stereo amplification. the preamplifiers have high gain and low distortion. a built-in rectifier for alc circuit implies good channel balance and large dynamic range can be cons tructed with addition of just an external time constant circuit. features * wide operating power supply voltage range (v cc =6.0v ~ 14v) * power-on mute circuit to avoid ?pop? noise generation. * no input coupling capacitors are necessary * high gain (g vo =80db)and low noise (v nin =1vrms) * low distortion (thd=0.1%) * good alc channel balance with built-in alc rectifier diode * adjustable alc dynamic range by external input resistor. sip-9 sop-14 *pb-free plating product number: BA3308l block diagram sip-9 + - ch1 123 4 5678 9 nf1 input1 output1 gnd alc vcc output2 input2 nf2 alc mute ch2 + - sop-14 + - + - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 n.c. n.c. n.c. n.c. n.c. alc vcc nf1 input1 input2 output1 gnd alc v cc output2 nf2
utc BA3308 linear integrated ci rcuit utc unisonic technologies co., ltd. 2 www.unisonic.com.tw qw-r107-015,a absolute maximum ratings (ta = 25
) parameter symbol ratings unit power supply voltage v cc 16 v sip-9 950 *1 power dissipation sop-14 p d 450 *2 mw operating temperature t opr 0 ~ +70
storage temperature t stg -65 ~ +125
*1 reduced by 9.5mw for each incr ease in ta of 1c over 25c. *2 reduced by 4.5mw for each incr ease in ta of 1c over 25c. (when mounted on a 70mm 70mm 1.6mm glass epoxy board) recommended operating conditions (ta = 25
) power supply voltagerange 1 +6.0v ~ +14v ( ta = 25~ +75
) power supply voltagerange 2 +4.5v ~ +14v ( ta = 0~ +75
) * when it is used below ta = 0
, please use it within the range of operating power supply voltage1. electrical characteristics (ta =25
, v cc =7.0v, f =1khz and bpf: 20hz ~ 20khz, unless otherwise noted.) parameter symbol test conditions min typ max unit maximum output voltage v om thd=1% 0.6 1.2 v rms input conversion noise voltage v nin conversion with r g =2.2k ? and nab34db at 1khz 1.0 2.0 v rms quiescent current i q v in =0vrms 1.5 3.3 4.5 ma input resistance r in 15 31.5 45 k ? total harmonic distortion thd nab34db, v out =40mv rms 0.1 0.3 % open loop voltage gain g vo v out = ? 10dbv 70 80 db alc range alc r g =3.9k ? , v in = ? 70dbv reference, thd=3% 40 70 db alc channel balance ? alc v in = ? 60dbv, ? 30dbv 0 2.5 db channel separation cs v o =0dbv, nab34db 60 75 db
utc BA3308 linear integrated ci rcuit utc unisonic technologies co., ltd. 3 www.unisonic.com.tw qw-r107-015,a application circuit + - ch1 123 4 5678 9 alc mute ch2 + - c3 100 ? f r3 39 ? r5 18k ? r1 3.9k ? c1 10 ? f + + + c5 10 ? f r7 1m ? ++ c7 22 ? f c8 330 ? f c6 10 ? f + c2 10 ? f ++ c4 100 ? f r4 39 ? r2 3.9k ? r6 18k ? r8 220 ? vcc 7v input1 input2 output1 output2 r9 (r10) 120k ? c9 (r10) 0.027 ? f 4.3k ? r11(r12) for playback,instead of r 5 and r 6 ,connect the following nab time constant circuit between pins 1 and 3 and 7 and 9.
utc BA3308 linear integrated ci rcuit utc unisonic technologies co., ltd. 4 www.unisonic.com.tw qw-r107-015,a total application circuit 220 ? 330 ? f + 3.9k ? 3.9k ? mic radio etc. bias osc c b 2 8 1 6 3 7 5 4 9 22 ? f 1m ? 18k ? 39 ? 100 ? f 0.027 ? f 120k ? 4.3k ? + c b 39 ? 100 ? f + 0.027 ? f 120k ? 4.3k ? 18k ? cc c a lr a cc c a lr a + + + 10 ? f 10 ? f utc BA3308 utc ba5406 10k ? 10k ? 2.2 ? f + + 2.2 ? f 33 ? f 100 ? f 120 ? + + 47 ? f + 470 ? f + 120 ? 33 ? f ++ 47 ? f 47 ? f 470 ? f 2.2 ? 0.22 ? f sp 3 ? sp 3 ? + 2.2 ? 9 12 6 10 11 2 3 7 1 4 1000 ? f + 9v 0.22 ? f + 8 5 notes: (1) switches are in the playback positions. (2) set the values of r a and c a depending on the characteristics of the playback/recording head. (3) the capacitor c b is for head resonance treble compensation during playback, and prevention of high-frequency noise. the recommended value is about 1000pf. (4) l and c c are a bias trap.
utc BA3308 linear integrated ci rcuit utc unisonic technologies co., ltd. 5 www.unisonic.com.tw qw-r107-015,a cont 2 (8) 1 (9) 3 (7) 5 r 7 (r 8 ) 1m ? c 7 (c 8 ) 22 ? f c 5 (c 6 ) 10 ? f c 1 (c 2 ) 10 ? f r 1 (r 1 ) 3.9k ? input c 3 (c 4 ) 100 ? f r 3 (r 4 ) 39 ? r 5 (r 6 ) 18k ? ch2 (ch1) ch2 (ch1) fig.1 ch1 (ch2) + - + + output + + ch1 (ch2) ch2 (ch1) ch2 (ch1) comp + - + - cont 4.5v f 5 r7 c7 2 (8) r1 ( r2 ) 3 (7) v out (dc+ac) 3v f fig.2 +
utc BA3308 linear integrated ci rcuit utc unisonic technologies co., ltd. 6 www.unisonic.com.tw qw-r107-015,a + - a1 2 (8) 1 (9) 3 (7) 5 c 1 (c 2 ) 10 ? f c 3 (c 4 ) 100 ? f r 3 (r 4 ) 39 ? r 11 (r 12 ) 4.3k ? r 9 (r 10 ) 120k ? c 5 (c 6 ) 10 ? f 0.027 ? f c 9 (c 10 ) output + + + input fig.3 operation notes the utc BA3308 has a built-in power-on mute circuit to prev ent generation of a ?pop? sound when the power is applied. the generation of the ? pop? sound is prevented by the dc blocking capacitors c3 and c4 connected to pins 1 and 9, and the charge time required fo r the ripple filter capacitor c8 that is connected to pin 6. to ensure correct operation of this circui t, use the values given in the application circuit for c3, c4, r3, r4, c8 and r8.
utc BA3308 linear integrated ci rcuit utc unisonic technologies co., ltd. 7 www.unisonic.com.tw qw-r107-015,a electrical characteristic curves 16 2 06 4 4 8 14 10 12 6 2 8 12 fig.4 quiescent current vs.power supply voltage power supply voltage , vcc (v) quiescent current, i q (ma) 16 10 0 14 -25 -50 25 0 4 8 100 12 6 2 75 fig.5 quiescent current vs.ambient temperature ambient temperature, ta (
) quiescent current, i q (ma) 10 0 50 v cc =7v 100 2 0 6 4 40 60 90 10 80 50 30 8 12 fig.6 voltage gain vs. power supply voltage power supply voltage, vcc (v) voltage gain, gvo (db) 16 70 20 14 v out =300mvrms f=1khz r l =10k ? -25 -50 25 0 40 80 100 120 60 20 75 fig.7 closed loop voltage gain vs. ambient temperature ambient temperature, ta (
) closed loop voltage gain, gvo (db) 100 0 50 vcc=7v v out =300mvrms f=1khz r l =10k ? r 5 , r 6 =18k ? r 5 , r 6 =6.8k ?
utc BA3308 linear integrated ci rcuit utc unisonic technologies co., ltd. 8 www.unisonic.com.tw qw-r107-015,a -60 -80 -20 -40 -20 20 60 0 -40 20 fig.8 alc characteristics input voltage, v in (dbv) output voltage, v out (dbv) 40 -0 vcc=7v f=1khz gv=52db ch2 v out 10 8 6 4 2 0 10 -80 -70 1 -50 -40 fig.9 input/output characteristics input voltage, v in (dbv) output voltage, v out (vrms) -30 0.1 vcc=7v f=1khz gv=52db r l =10k ? v out 0.01 -60 -20 ch1 1.6 2 0 6 4 0.4 0.8 1.4 10 1.2 0.6 0.2 8 12 fig.10 maximum output voltage vs. power supply voltage power supply voltage, vcc (v) maximum output voltage, v om (vrms) 16 1 0 14 f=1khz thd=1% r l =10k ? 2 100 0.8 1.2 1.8 1.6 1 0.6 1k fig.11 maximum output voltage vs. load resistance load resistance, r l ( ? ) maximum output voltage, v om (vrms) 10k 1.4 0 vcc=7v f=1khz thd=1% 0.4 0.2 utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.

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