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 - IN1A 2 20 + IN2A 19 - IN2A - + + IN1B 3 - IN1B 4 +- 18 + IN2B 17 - IN2B +- - + + IN1C 5 - IN1C 6 16 + IN2C 15 - IN2C +- - + OUT1 14 OUT2 7 3 SW1 3 13 Vref OUT 8 + SW2 - 12 1 / 2 VCC 9 GND 10 11 VCC R R BA3131FS Standard ICs !Absolute maximum ratings (Ta=25C) 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 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. Typ. Max. Unit Conditions 6.0 8.0 16.0 V single power source VCC !Electrical characteristics (unless otherwise noted, Ta=25C, Vcc=8V) Parameter Min. Typ. Max. Unit Quiescent current Iq 2.0 4.9 7.8 mA VIN = 0, RL = , SW pin open Fig.2 Input offset voltage Vio - 0.5 5.0 mV RS 10k Fig.1 Input offset current Iio - 5 200 nA Input bias current Ib - 50 500 nA 1 Fig.1 High-amplitude voltage gain Avol 86 110 - dB RL 2k, VO = 1.5V Fig.1 Common-mode input voltage Vicm 3 6 - V In-phase signal rejection ratio CMRR 60 72 - dB RS 10k Fig.1 Power supply voltage rejection ratio PSRR 76 90 - dB RS 10k Fig.1 Maximum output voltage VOH / VOL 3 6 - V RL 10k 3 6 - V RL 2k Fig.3 / Fig.4 Input conversion noise voltage Vn - 2.0 4.0 Vrms 2 Fig.7 VREF - - Reference voltage change 10 mV Conditions Measurement circuit Symbol Fig.1 Fig.1 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 Min. Typ. Max. SR 0.5 1.2 - Gainbandwidth product GBW 1.5 2.6 - MHz f = 10kHz Fig.6 Crosstalk between A, B and C CTABC 60 73 - dB f = 1kHz Fig.8 Total harmonic distortion THD - % GV = 0dB, f = 1kHz, VO = 1Vrms Fig.9 CS 90 dB f = 1kHz, input conversion Fig.10 Slew rate Channel separation This item is not guaranteed during processes. 0.0025 0.01 115 - Unit Conditions Measurement circuit Symbol V / S GV = 0dB, RL = 2k Fig.5 BA3131FS Standard ICs !Measurement circuit C2 0.1F RK 50k RK 500k C1 EK 0.1F S1 VCC Rs Ri 50 10k VO 15V RK 500k + - NULL DUT - VF + Rs Ri 50 10k S3 C3 1000pF S4 - 15V S2 Rf 50k VR RL2 10k RL1 2k Vref Vref Vref C2 and C3 are used to prevent oscillation (adjustment required) Fig.1 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 2.5 VF6 6 8 VF7 2 0 VF8 6 Vref -- VF9 18 Vref -- VF10 !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) S3 S4 Equation OFF OFF 3 ON ON OFF 4 ON ON OFF OFF 5 ON ON OFF OFF 6 BA3131FS Standard ICs !Measurement circuits Vcc Iq Vcc A + - + 2k or 10k - 1V Vref Vref Vref V VoH Vref Fig. 3 Maximum output voltage: High Fig.2 Iq Vcc = 18V Vcc + - 1V Vref Vref 2k or 10k - VOUT V VoL + VIN RL 2k Vref Vref Fig. 4 Maximum output voltage: Low Fig. 5 Slew rate ( ) Vout (V) 15 Vcc t (sec) 10k 0.1F - 10F + V VIN f = 10kHz 5 t SR = 10 / t Fig. 6 Slew rate ( ) Vref GB = Vo / VIN x f Fig. 7 Band width frequency gain Vo BA3131FS Standard ICs 100k - A 1k / 100k 1k + 100k Vcc 3.3F 0.47F B.P.F 20Hz ~ 30kHz + - 2.2k 56k Vref Von 1k / 100k Vref - B Vo + 100k 1k 100k - C Vref Vref 100k + 1k CTABC = 20log 1k / 100k 1k Vn = 47F Vcc = 8V Von 3 100 x 10 1/ 1 x 103 Vref ~ VIN f = 1kHz Channel selection Vref Fig. 8 Input conversion noise voltage Vo Vcc 3.3F 0.47F + 56k 100k Distortion meter - 2.2k VIN f = 1kHz Fig. 9 Crosstalk between A and B 100k - Vo1 + ~ Vref 1k CH-1 1k Vref 1k / 100k Vo = 1Vrms Vref Fig. 10 Total harmonic distortion 100k 1k - Vo2 + ~ Vref CH-2 f = 1kHz 1k / 100k Vref CS = 20log Vo1 100Vo2 Vcc = 8V Fig. 12 Channel separation ( ) Vref Fig. 11 Channel separation ( ) VoA or VoB VoC 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 3.3 IN2C C6 3.3 IN2B C5 IN2A R16 3.3 OUT2 10k R14 C4 3.3k Vcc = 8V 20 19 18 17 16 15 14 13 12 11 C7 BA3131FS 1 2 3 4 5 100 6 7 8 9 C9 C10 0.022 22 C8 100 10 R13 3.3k 3.3 R15 IN1A OUT1 C3 IN1B C2 IN1C 10k 3.3 3.3 C1 R1 47k R7 1k R3 47k R9 1k R5 47k R11 1k SW1 SW2 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 - 35 150 22 - 42 300 47 - 48 550 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 ch2 ch3 OFF Conditions SW1 (8pin) H H L L SW2 (9pin) H L H L 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 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 0.36 0.1 5k 10k 20k Fig. 15 Channel separation and crosstalk vs. frequency 4.1 5 500 1k FREQUENCY: f (Hz) Fig. 14 Distortion vs. frequency 0 50 100 0.3Min. 0.15 SSOP-A20 DISTN (THD + Vn) (%) 0.1 VCC = 8V GV = 0dB 0.05 100 C.S., CTABC (dB) DISTN (THD + Vn) (%) 0.5 0.01 fIN = 10kHz 1kHz 100Hz 0.005 0.001 0.05 0.1 0.5 1.0 OUTPUT VOLTAGE: Vo (Vrms) Fig. 16 Distortion vs. output voltage