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BA3131FS
Standard ICs
Dual operational amplifier with switch, for audio use (3 inputs x 1 output x 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 = 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.
!Block diagram
+ IN1A
1
20 + IN2A
- IN1A
2 -+ +-
19 - IN2A
+ IN1B
3
18 + IN2B
- IN1B
4 -+ +-
17 - IN2B
+ IN1C
5
16 + IN2C
- IN1C
6 -+ +-
15 - IN2C
OUT1
7 3 3
14 OUT2
SW1
8 -
+
13 Vref OUT
SW2
9
12 1 / 2 VCC
GND 10 R R
11 VCC
BA3131FS
Standard ICs
!Absolute maximum ratings (Ta=25C)
Parameter
Power supply voltage Power dissipation Operating temperature Storage temperature Common-mode input voltage Differential input voltage Load current
Symbol VCC Pd Topr Tstg Vi Vid IoMax.
Limits 18.0 750 - 40 ~ + 85 - 55 ~ + 125 3 ~ VCC VCC 50.0
Unit V mW C C V V mA
Reduced by 7.5mW for each increase in Ta of 1C
over 25C. (When mounted on a glass epoxy board (90mm x 50mm x 1.6t))
!Recommended operating conditions (Ta=25C)
Parameter Operating power supply voltage Symbol Min. VCC 6.0 Typ. 8.0 Max. 16.0 Unit V Conditions single power source
!Electrical characteristics (unless otherwise noted, Ta=25C, Vcc=8V)
Parameter
Quiescent current Input offset voltage Input offset current Input bias current High-amplitude voltage gain Common-mode input voltage In-phase signal rejection ratio Power supply voltage rejection ratio Maximum output voltage Input conversion noise voltage Reference voltage change
Symbol Iq Vio Iio Ib Avol Vicm CMRR PSRR VOH / VOL Vn VREF
Min. 2.0 86 3 60 76 3 3 -
Typ. 4.9 0.5 5 50 110 6 72 90 6 6 2.0 -
Max. 7.8 5.0 200 500 4.0 10
Unit mA mV nA nA dB V dB dB V V Vrms mV
1
Conditions
VIN = 0, RL = , SW pin open
Measurement circuit Fig.2 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1
RS 10k
RL 2k, VO = 1.5V RS 10k RS 10k RL 10k RL 2k
2
Fig.1 Fig.1 Fig.3 / Fig.4 Fig.7 -
Ioref = 1mA
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 = 2k, Matsushita Tsuko VP-9690A (using DIN audio filter)
!Design guaranteed values (unless otherwise noted, Ta=25C, Vcc=8V)
Parameter
Slew rate Gainbandwidth product Crosstalk between A, B and C Total harmonic distortion Channel separation
Symbol SR GBW CTABC THD CS
Min. 0.5 1.5 60 90
Typ. 1.2 2.6 73
Max. -
Unit
Conditions
Measurement circuit Fig.5 Fig.6 Fig.8 Fig.9 Fig.10
V / S GV = 0dB, RL = 2k MHz dB % dB f = 10kHz f = 1kHz GV = 0dB, f = 1kHz, VO = 1Vrms
f = 1kHz, input conversion
0.0025 0.01 115 -
This item is not guaranteed during processes.
BA3131FS
Standard ICs
!Measurement circuit
C2 0.1F
RK 50k
RK 500k EK
C1
0.1F S1 VCC Rs 50 Ri 10k VO 15V RK 500k - NULL VF
+
DUT - Rs 50 Ri 10k S3 S4
+
C3 1000pF - 15V S2 Rf 50k RL1 2k RL2 10k
VR
Vref
Vref
Vref
C2 and C3 are used to prevent oscillation (adjustment required)
Fig.1
BA3131FS
Standard ICs
!Measurement conditions (Figure 1)
Measurement Item Input offset voltage Input offset current Input bias current
VCC 8 8 8
VR Vref Vref Vref
EK -- -- -- 5.5 2.5 8 0 -- --
VF VF1 VF2 VF3 VF4 VF5 VF6 VF7 VF8 VF9 VF10
S1 ON
S2 ON
S3
S4
Equation 1 2 3
OFF OFF
OFF OFF OFF OFF OFF ON ON ON OFF ON OFF OFF
High-amplitude voltage gain Common-mode signal rejection ratio (Common-mode input voltage) Power supply voltage rejection ratio
8 8 8 6 18
Vref 6 2 Vref Vref
ON
OFF
4
ON
ON
OFF OFF
5
ON
ON
OFF OFF
6
!Equations (1) Input offset voltage (Vio) Vio = | VF1 | / (1 + Rf / Rs) (2) Input offset current (Iio) Iio = | VF2 - VF1 | / (Ri (1 + Rf / Rs) ) (3) Input bias current (Ib) Ib = | VF4 - VF3 | / (2 Ri (1 + Rf / Rs) ) (4) High-amplitude voltage gain (Avol) Avol = 20log (3 (1 + Rf / Rs) / | VF6 - VF5 | ) (dB) (5) In-phase signal rejection ratio (CMRR) CMRR = 20log (4 (1 + Rf / Rs) / | VF8 - VF7 | ) (dB) (6) (In-phase input voltage range) (PSRR) PSRR = 20log (12 (1 + Rf / Rs) / | VF10 - VF9 | ) (dB)
BA3131FS
Standard ICs
!Measurement circuits
Vcc Iq
Vcc
A
+
+
-
1V
- 2k or 10k V VoH
Vref
Vref
Vref
Vref
Fig.2 Iq
Fig. 3 Maximum output voltage: High
Vcc = 18V
Vcc
+
- 1V 2k or 10k
- VOUT
V
VoL
VIN
+
RL 2k
Vref
Vref
Vref
Vref
Fig. 4 Maximum output voltage: Low
Fig. 5 Slew rate ( )
15
Vout (V)
t (sec)
Vcc 10k 0.1F - 10F
+
VIN f = 10kHz
5 t SR = 10 / t
V GB = Vo / VIN x f
Vo
Vref
Fig. 6 Slew rate ( )
Fig. 7 Band width frequency gain
BA3131FS
Standard ICs
100k - A
1k / 100k 1k
Vcc 3.3F 0.47F
+
100k - B
+
- 2.2k 56k 100k
B.P.F 20Hz ~ 30kHz
Von
Vref 1k
1k / 100k
+
Vo
100k
Vref
Vref 100k 1k 47F Vn = Von 3 100 x 10 1/ 1 x 103
Vref 1k
- C
+
1k / 100k Vref CTABC = 20log Vcc = 8V VoA or VoB VoC
~
VIN f = 1kHz Vref
Channel selection
Fig. 8 Input conversion noise voltage
Fig. 9 Crosstalk between A and B
Vcc 3.3F
Vo 0.47F Distortion meter 100k
100k
+
56k 2.2k VIN f = 1kHz -
-
~
Vref 1k
+
Vo1
CH-1
Vref Vo = 1Vrms
Vref Vref 1k 1k / 100k
Fig. 10 Total harmonic distortion
Fig. 11 Channel separation ( )
100k 1k
-
+
Vo2
~
Vref
f = 1kHz
CH-2
1k / 100k Vo1 100Vo2
Vref
CS = 20log Vcc = 8V
Fig. 12 Channel separation ( )
BA3131FS
Standard ICs
!Application example
Aamp: Gv = 20dB Bamp: Gv = 10dB Camp: Gv = 0dB
R2 47k 3.3 IN2C C6 IN2B C5 IN2A C4 3.3 3.3
R8 1k
R4 47k
R10 1k
R6 47k
R12 1k
R16 OUT2 10k R14 3.3k Vcc = 8V 20 19 18 17 16 15 14 13 12 11
C7
C8
C9
C10 100
BA3131FS
100
0.022 22
1
2
3
4
5
6
7
8
9
10
R13 3.3 IN1A C3 IN1B C2 IN1C C1 R1 47k R7 1k R3 47k R9 1k R5 47k R11 1k SW1 SW2 10k 3.3 3.3 3.3k R15 OUT1
COM.
Fig.13
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 1F may produce oscillation, so if AC grounding is being used, always use a bypass capacitor with a value of at least 10F. Also, Pin 12 is designated for reference circuit input, so if reference output is being used, always use a bypass capacitor for AC grounding. (We recommend a bypass capacitor with a value of 22F.) *Reference data (these values are intended only as a reference, and performance is not guaranteed)
Pin 12 bypass capacitor (F) Ripple rejection ratio (fIN = 100 Hz) (dB) Output rise time (ms)
10 22 47
capacitor 100F, output smoothing voltage.
- 35 - 42 - 48
150 300 550
Test conditions: When power supply is on (VCC = 8V), time equal to 90% of VCC bypass capacitor,Pin 13 bypass
(2) This IC offers stability even at low gain (0 to 20dB), but a capacitance load of 200pF or higher may cause oscillation (the phase margin at a capacitance of 200pF is 10 typ. (Ta = 85C, 0dB point) ). Consequently, please make sure sufficient care is taken in terms of the capacitance load. When using a 0dB buffer, as shown in the application example (Figure 13), introducing a bias resistance of several k to the negative input (R11 and R12 in Figure 13, indicated as circled items) results in greater stability in terms of the capacitance load.
!Truth value table
ch1 SW1 (8pin) SW2 (9pin) H H ch2 H L ch3 L H OFF L L
Conditions
Corresponds to COM output
"H" when the applied voltage at pins 8 and 9 is 2.0V or more, and "L" when it is 1.0V or less.
BA3131FS
Standard ICs
!Electrical characteristic curves
1 0.5 Vcc = 8V Gv = 0dB Vo = 1Vrms
C.S., CTABC (dB)
120 110
DISTN (THD + Vn) (%)
0.1 0.05 VCC = 8V GV = 0dB
DISTN (THD + Vn) (%)
100
0.1 0.05
CTABC
90 80 70 60 50 Vcc = 8V Gv = 0dB Vo = 1Vrms C.S.
0.01 0.005
0.01 0.005
fIN = 10kHz 1kHz 100Hz
0.00 20
50 100
500 1k FREQUENCY: f (Hz)
5k 10k 20k
40 20
50 100
500 1k
5k 10k 20k
0.001
0.05
0.1
0.5
1.0
FREQUENCY: f (Hz)
OUTPUT VOLTAGE: Vo (Vrms)
Fig. 14 Distortion vs. frequency
Fig. 15 Channel separation and crosstalk vs. frequency
Fig. 16 Distortion vs. output voltage
4.1
REFERENCE VOLTAGE :Vref (V)
Vcc = 8V
SINK 4.0 SOURCE
3.9 0 5 10
13pin OUTPUT CURRENT: IOUT (mA)
Fig. 17 Reference voltage vs. pin 13 output current
!External dimensions (Units: mm)
8.7 0.2 20
7.8 0.3 5.4 0.2
11
1
1.8 0.1
10
0.11
0.8
0.36 0.1
0.3Min. 0.15
SSOP-A20
0.15 0.1

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