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BA3131FS-E2

P1-P3P4-P5
1/4
REV. B
Structure : Silicon Monolithic Integrated Circuit
Product : 3 Dual operational amplifier with switch for car audio systems
Type :
BA3131FS
Function : 1. High gain and low distortion. (Gv = 110dB, THD = 0.0015% typ.)
2. Low noise. (Vn = 2Vrms 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.
Absolute Maximum Ratings (Ta=25℃)
Parameter
Symbol Rating Unit
Power supply voltage Vcc 18.0 V
Power dissipation Pd 750* mW
Operating temperature Topr －40～＋85 ℃
Storage temperature Tastg －55～＋125 ℃
Common-mode input voltage Vi 3～Vcc V
Differential input voltage Vid Vcc V
Load current IoMax. ±50.0 mA
※This value decreases 7.5 mW/℃ for Ta=25℃ or more.
(When mounted on a glass epoxy board (90mm 50mm 1.6t))
Operating Voltage Range (Ta=25℃)
Parameter
Symbol Min. Typ. Max. Unit Conditions
Power supply voltage Vcc 6.0 8.0 16.0 V
Single power
source
Application example
Note that ROHM cannot provide adequate confirmation of patents.
The product described in this specification is designed to be used with ordinary electronic equipment or devices (such as audio-visual
equipment, office-automation equipment, communications devices, electrical appliances, and electronic toys).
Should you intend to use this product with equipment or devices which require an extremely high level of reliability and the malfunction of
which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor
controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance.
2/4
REV. B
Electrical characteristics
（unless otherwise noted, Ta=25℃, Vcc=8V）
Parameter Symbol
Limit
Unit Conditions
Min. Typ. Max.
Quiescent current Iq 2.0 4.9 7.8 mA
V
IN
＝0,RL=∞,SW pin open
Input offset voltage Vio － 0.5 5.0 mV
RS≦10kΩ
Input offset current Iio － 5 200 nA
Input bias current Ib － 50 500 nA
＊
1
High-amplitude voltage gain Avol 86 110 － dB
RL≧2kΩ，VO=±1.5V
Common-mode input voltage Vicm 3 6 － V
In-phase signal rejection ratio CMRR 60 72 － dB
RS≦10kΩ
Power supply voltage rejection ratio
PSRR 76 90 － dB
RS≦10kΩ
Maximum output voltage V
OH
/V
OL
3 6 － V
RL≧10kΩ
3 6 － V
RL≧2kΩ
Input conversion noise voltage Vn － 2.0 4.0 μVrms
＊
2
Reference voltage change ΔV
REF
－ － ±10 mV
Ioref=±1mA
0. 1 Because the first stage is configured with PNP transistors, input bias current is from the IC.
0. 2 Tested under the following conditions: Gv = 40dB, RS = 2kΩ, Matsushita Tsuko VP-9690A (using DIN audio filter)
Design guaranteed values
（unless otherwise noted, Ta=25℃, Vcc=8V）
Parameter Symbol
Limit
Unit Conditions
Min. Typ. Max.
Slew rate SR 0.5 1.2 － V/μS
Gv＝0dB,RL=2kΩ
Gainbandwidth product GBW 1.5 2.6 － MHz
f＝10kHz
Crosstalk between A, B and C CT
ABC
60 73 － dB
f＝1kHz
Total harmonic distortion THD － 0.0025 0.01 ％
Gv＝0dB，f＝1kHz，
Vo＝1Vrms
Channel separation CS 90 115 － dB
f＝1kHz,input conversion
※This item is not guaranteed during processes.
Outline Dimension
SSOP-A20
（Unit：mm）
BA
3
1
3
1F
S
LOT No.
3/4
REV. B
Block Diagram
Terminal Number/ Terminal Name
Application example
(1) Numbers and data in entries are representative design values and are not guaranteed values of the items.
(2)Although we are confident in recommending the sample application circuits, carefully check their
characteristics further when using them. When modifying externally attached component constants before
use, determine them so that they have sufficient margins by taking into account variations in externally
attached components and the Rohm LSI, not only for static characteristics but also including transient
characteristics.
(3) Absolute maximum ratings
If applied voltage, operating temperature range, or other absolute maximum ratings are exceeded, the LSI
may be damaged. Do not apply voltages or temperatures that exceed the absolute maximum ratings. If
you think of a case in which absolute maximum ratings are exceeded, 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.
(4) GND potential
Make the GND pin voltage such that it is the lowest voltage even when operating below it. Actually confirm
that the voltage of each pin does not become a lower voltage than the GND pin, including transient
phenomena.
(5) Thermal design
Perform thermal design in which there are adequate margins by taking into account the allowable power
dissipation in actual states of use.
Terminal
Number
Terminal
Name
1 +IN1A
2 -IN1A
3 +IN1B
4 -IN1B
5 +IN1C
6 -IN1C
7 OUT1
8 SW1
9 SW2
10 GND
11 Vcc
12 1/2 Vcc
13 Vref OUT
14 OUT2
15 -IN2C
16 +IN2C
17 -IN2B
18 +IN2B
19 -IN2A
20 +IN2A
P1-P3P4-P5

BA3131FS-E2

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Audio Amplifiers OP AMP DUAL GP 16V 20PIN
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