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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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