Manual

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BA3131FS

Standard ICs

Dual operational amplifier with switch,

for audio use (3 inputs

1 output

BA3131FS

The BA3131FS contains two built-in circuits with operational amplifiers configured of three differential input circuits, an

output circuit, and a switch circuit. The three differential input circuits are separate, enabling independent settings to be

entered for the gain and frequency characteristics.

Applications

Car stereos, audio amplifiers and other electronic circuits

Features

1) High gain and low distortion. (Gv = 110dB, THD = 0.0015% typ.)

2) Low noise. (Vn = 2

Vrms typ.)

3) Switching circuit can be directly coupled to microcomputer port.

4) Small switching noise.

5) Equipped with 1 / 2 Vcc output circuit for single power supply.

Block diagram

GND

SW2

OUT1

- IN1C

+ IN1C

+ IN1B

- IN1B

+ IN1A

- IN1A

SW1

1 / 2 V

OUT2

- IN2C

+ IN2C

+ IN2B

- IN2B

+ IN2A

- IN2A

Vref OUT

–

Summary of content (9 pages)

PAGE 1
BA3131FS Standard ICs Dual operational amplifier with switch, for audio use (3 inputs × 1 output × 2) BA3131FS The BA3131FS contains two built-in circuits with operational amplifiers configured of three differential input circuits, an output circuit, and a switch circuit. The three differential input circuits are separate, enabling independent settings to be entered for the gain and frequency characteristics.
PAGE 2
BA3131FS Standard ICs !Absolute maximum ratings (Ta=25°C) Parameter Symbol Limits Power supply voltage VCC 18.0 V Power dissipation Pd 750∗ mW Operating temperature Topr – 40 ~ + 85 ˚C Storage temperature Tstg – 55 ~ + 125 ˚C Vi 3 ~ VCC V Common-mode input voltage Differential input voltage Vid VCC Load current IoMax. ± 50.0 Unit V mA ∗ Reduced by 7.5mW for each increase in Ta of 1˚C over 25˚C. (When mounted on a glass epoxy board (90mm × 50mm × 1.
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BA3131FS Standard ICs !Measurement circuit C2 0.1µF RK 50kΩ RK 500kΩ C1 EK 0.1µF S1 VCC Rs Ri 50Ω 10kΩ VO 15V RK 500kΩ + – NULL DUT – VF + Rs Ri 50Ω 10kΩ S3 C3 1000pF S4 – 15V S2 Rf 50kΩ VR RL2 10kΩ RL1 2kΩ Vref Vref Vref ∗ C2 and C3 are used to prevent oscillation (adjustment required) Fig.
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BA3131FS Standard ICs !Measurement conditions (Figure 1) VCC VR EK VF S1 S2 Input offset voltage 8 Vref — VF1 ON ON OFF OFF 1 Input offset current 8 Vref — VF2 OFF OFF OFF OFF 2 VF3 OFF ON VF4 ON OFF ON Measurement Item Input bias current 8 Vref High-amplitude voltage gain 8 Vref Common-mode signal rejection ratio (Common-mode input voltage) 8 8 Power supply voltage rejection ratio — 5.5 VF5 2.
PAGE 5
BA3131FS Standard ICs !Measurement circuits Vcc Iq Vcc A + – + 2k or 10kΩ – 1V Vref Vref Vref V VoH Vref Fig. 3 Maximum output voltage: High Fig.2 Iq Vcc = 18V Vcc + – 1V Vref Vref 2k or 10kΩ – VOUT V VoL + VIN RL 2kΩ Vref Vref Fig. 4 Maximum output voltage: Low Fig. 5 Slew rate ( ) Vout (V) 15 Vcc t (µsec) 10kΩ 0.1µF – 10µF + V VIN f = 10kHz 5 t SR = 10 / t Fig. 6 Slew rate ( ) Vref GB = Vo / VIN × f Fig.
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BA3131FS Standard ICs 100kΩ – A 1kΩ / 100kΩ 1kΩ + 100kΩ Vcc 3.3µF 0.47µF B.P.F 20Hz ~ 30kHz + – 2.2kΩ 56kΩ Vref Von 1kΩ / 100kΩ Vref – B Vo + 100kΩ 1kΩ 100kΩ – C Vref Vref 100kΩ + 1kΩ CTABC = 20log 1kΩ / 100kΩ 1k Vn = 47µF Vcc = 8V Von 3 100 × 10 1÷ 1 × 103 Vref ~ VIN f = 1kHz Channel selection Vref Fig. 8 Input conversion noise voltage Vo Vcc 3.3µF 0.47µF + 56kΩ 100kΩ Distortion meter – 2.2kΩ VIN f = 1kHz Fig.
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BA3131FS Standard ICs !Application example R2 47k R8 1k R4 47k R10 1k R6 47k Aamp: Gv = 20dB Bamp: Gv = 10dB Camp: Gv = 0dB R12 1k 3.3µ IN2C C6 3.3µ IN2B C5 IN2A R16 3.3µ OUT2 10k R14 C4 3.3k Vcc = 8V 20 19 18 17 16 15 14 13 12 11 C7 BA3131FS 1 2 3 4 5 100µ 6 7 8 9 C9 C10 0.022µ 22µ C8 100µ 10 R13 3.3k 3.3µ R15 IN1A OUT1 C3 IN1B C2 IN1C 10k 3.3µ 3.3µ C1 R1 47k R7 1k R3 47k R9 1k R5 47k R11 1k SW1 SW2 µCOM. Fig.
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BA3131FS Standard ICs !Operation notes (1) Pin 13 is the reference output pin, from which 1 / 2 Vcc is output. The value for the bypass capacitor should be determined based on the desired characteristics. A value between 500pF and 1µF may produce oscillation, so if AC grounding is being used, always use a bypass capacitor with a value of at least 10µF. Also, Pin 12 is designated for reference circuit input, so if reference output is being used, always use a bypass capacitor for AC grounding.
PAGE 9
BA3131FS Standard ICs !Electrical characteristic curves 120 1 Vcc = 8V Gv = 0dB Vo = 1Vrms 0.1 110 CTABC 0.05 0.01 90 C.S. 80 70 60 0.005 Vcc = 8V Gv = 0dB Vo = 1Vrms 50 0.00 20 50 100 500 1k 40 20 5k 10k 20k FREQUENCY: f (Hz) REFERENCE VOLTAGE :Vref (V) Vcc = 8V SINK 4.0 SOURCE 3.9 10 13pin OUTPUT CURRENT: ∆IOUT (mA) Fig. 17 Reference voltage vs. pin 13 output current !External dimensions (Units: mm) 1 10 5.4 ± 0.2 11 0.8 0.15 ± 0.1 1.8 ± 0.1 0.11 7.8 ± 0.3 8.7 ± 0.2 20 0.