Rainbow Electronics BA3131FS User Manual
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.
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 = 2µVrms 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
!!!!
+ IN1A
- IN1A
+ IN1B
- IN1B
+ IN1C
- IN1C
OUT1
SW1
SW2
GND
1
2
3
4
5
6
7
8
9
10
+
–
+
–
+
–
33
RR
+
–
+
–
+
–
+
–
20
19
18
17
16
15
14
13
12
11
+ IN2A
- IN2A
+ IN2B
- IN2B
+ IN2C
- IN2C
OUT2
Vref OUT
1 / 2 V
CC
V
CC
BA3131FS
Standard ICs
Absolute maximum ratings
!!!!
Parameter Symbol Limits Unit
Power supply voltage V
Power dissipation 750
Operating temperature Topr ˚C
Storage temperature Tstg ˚C
Common-mode input voltage V
Differential input voltage V
Load current ± 50.0 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 × 1.6t))
Recommended operating conditions
!!!!
Parameter Symbol Min. Typ. Max. Unit Conditions
Operating power supply voltage
Electrical characteristics
!!!!
Parameter Symbol Min. Typ. Max. Unit Conditions
Quiescent current 2.0 4.9 7.8 mA
Input offset voltage - 0.5 5.0 mV
Input offset current - 5 200 nA
Input bias current - 50 500 nA
High-amplitude voltage gain 86 110 - dB
Common-mode input voltage 36-V
In-phase signal rejection ratio CMRR 60 72 - dB
Power supply voltage rejection ratio PSRR 76 90 - dB
Maximum output voltage /
Input conversion noise voltage - 2.0 4.0 µVrms
Reference voltage change - - ± 10 mV -
1 Because the first stage is contigured with PNP transistors, input bias current is from the IC.
∗
2 Tested under the following conditions: GV = 40dB, RS = 2kΩ, Matsushita Tsuko VP-9690A (using DIN audio filter)
∗
(Ta=25°C)
VCC
Pd
Vid
oMax.
I
Vi
18.0
∗
– 40 ~ + 85
– 55 ~ + 125
3 ~ VCC
VCC
mW
(Ta=25°C)
6.0 8.0 16.0 V single power source
CC
V
(unless otherwise noted, Ta=25°C, Vcc=8V)
Iq
Vio
Iio
Ib
Avol
Vicm
V
OH
36-V
V
Vn
∆V
36-V
OL
REF
VIN = 0, RL = ∞ , SW pin open
RS ≤ 10kΩ
1
∗
RL ≥ 2kΩ, V
O = ± 1.5V
RS ≤ 10kΩ
RS ≤ 10kΩ
RL ≥ 10kΩ
RL ≥ 2kΩ
2
∗
= ± 1mA
Ioref
Measurement
circuit
Fig.2
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.1
Fig.3
/
Fig.4
Fig.7
Design guaranteed values
!!!!
Parameter Symbol Min. Typ. Max. Unit Conditions
Slew rate SR 0.5 1.2 - V / µS
Gainbandwidth product GBW 1.5 2.6 - MHz f = 10kHz
Crosstalk between A, B and C CT
Total harmonic distortion
Channel separation
This item is not guaranteed during processes.
∗
(unless otherwise noted, Ta=25°C, Vcc=8V)
ABC
60 73 - dB f = 1kHz
THD - 0.0025 0.01 %
CS 90 115 - dB
V
= 0dB, RL = 2kΩ
G
GV = 0dB, f = 1kHz, VO = 1Vrms
f = 1kHz, input conversion
Measurement
circuit
Fig.5
Fig.6
Fig.8
Fig.9
Fig.10
Standard ICs
Measurement circuit
!!!!
C2
0.1µF
RK
50kΩ
BA3131FS
RK
RK
500kΩ
C3
1000pF
500kΩ
EK
S1
V
Rs
50Ω
Ri
10kΩ
CC
V
O
+
DUT
–
Rs
50Ω
50kΩ
VR
Ri
10kΩ
S2
Rf
Vref
RL1
2kΩ
S3
Vref
S4
RL2
10kΩ
Vref
C2 and C3 are used to prevent oscillation (adjustment required)
∗
–
NULL
+
C1
0.1µF
15V
VF
– 15V
Fig.1
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