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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 amplifiers and other electronic circuits Car stereos, audio *Features and low distortion. 1) High gain
(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
1
Standard ICs
BA3131FS
*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 0 ~ 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 = 8 V)
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 RS RS RL RL
2 1
Conditions VIN = 0, RL = , SW pin open RS 10k
Measurement circuit Fig.2 Fig.1 Fig.1 Fig.1
RL
2k, VO = 1.5V
Fig.1 Fig.1
10k 10k 10k 2k
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 = 8 V)
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. 2
Standard ICs
BA3131FS
*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
3
Standard ICs
BA3131FS
*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 voltage (Vio) (1) Input offset
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)
4
Standard ICs
BA3131FS
*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)
Vcc t (sec) 10k 0.1F - 10F
+
VIN f = 10kHz 5 t SR = 10 / t Vref GB = Vo / VIN x f V Vo
Fig. 6 Slew rate (@)
Fig. 7 Band width frequency gain
5
Standard ICs
BA3131FS
100k - A
1k / 100k 1k Vcc 3.3F 0.47F 1k / 100k
+
100k - B
+
- 2.2k 56k 100k
B.P.F 20Hz ~ 30kHz
Von
Vref 1k
+
Vo
100k
Vref Vref Vref 100k 1k 47F Vn = 1 Von 3 100 x 10 1 x 103 Vref 1k
- C
+
1k / 100k 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
+
56k 2.2k VIN f = 1kHz -
100k
~
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 (@)
6
Standard ICs
BA3131FS
*Application example
R2 47k 3.3 IN2C C6 IN2B C5 IN2A C4 3.3 3.3
R8 1k
R4 47k
R10 1k
R6 47k
R12 1k
Aamp: Gv = 20dB Bamp: Gv = 10dB Camp: Gv = 0dB
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
7
Standard ICs
BA3131FS
*Operationisnotesreference output pin, from which 1 / 2 (1) Pin 13 the
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) 10 22 47 Ripple rejection ratio (fIN = 100 Hz) (dB) - 35 - 42 - 48 Output rise time (ms) 150 300 550
Test conditions: When power supply is on (VCC = 8V), time equal to 90% of VCC bypass capacitor,Pin 13 bypass capacitor 100F, output smoothing voltage.
(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.
8
Standard ICs
BA3131FS
*Electrical characteristic curves
1 120 Vcc = 8V Gv = 0dB Vo = 1Vrms C.S., CTABC (dB) 110 DISTN (THD + Vn) (%) 100 0.1 0.05 90 80 70 60 50 0.001 20 50 100 500 1k FREQUENCY: f (Hz) 5k 10k 20k 40 20 50 100 500 1k Vcc = 8V Gv = 0dB Vo = 1Vrms C.S. CTABC 0.5 DISTN (THD + Vn) (%)
0.1 0.05 VCC = 8V GV = 0dB
0.01 0.005
0.01 0.005
fIN = 10kHz 1kHz 100Hz
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
9

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