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| Standard ICs Dual operational amplifier with switch, for audio use (2 inputs / 1 output x 2) BA3129 / BA3129F The BA3129 and BA3129F contain two circuits with operational amplifiers configured of two differential input circuits, an output circuit, and a switch circuit. The two differential input circuits are separate, enabling independent settings to be entered for the amplifier gain and frequency characteristic. *Applications and other electronic circuits Audio amplifiers *Features both dual or single power supplies. 1) Can drive 2) High gain and low distortion. (Gv = 110dB, THD = 0.0015%) 3) Low noise. (Vn = 2Vrms typ.: FLAT) 4) Little switching noise. 5) Internal phase compensation. *Block diagram + IN1A 1 -+ - IN1A 2 14 + IN2A +- 13 - IN2A + IN1B 3 -+ 12 + IN2B +- 11 - IN2B - IN1B 4 OUT1 5 10 OUT2 SW1 6 9 SW2 VEE 7 8 VCC 1 Standard ICs BA3129 / BA3129F *Absolute maximum ratings (Ta = 25C) Parameter Applied voltage Power dissipation BA3129 BA3129F Symbol VCC Pd Topr Tstg Vid Vi IoMax. Limits 18 11001 4502 - 20 ~ + 75 - 55 ~ + 125 VCC - VCC ~ VCC 50 Unit V mW C C V V mA Operating temperature Storage temperature Differential input voltage Common-mode input voltage Load current 1 Reduced by 11mW for each increase in Ta of 1C over 25C. 2 Reduced by 4.5mW for each increase in Ta of 1C over 25C. *Recommended operating conditions (Ta = 25C) Parameter Operating power supply voltage Load conditions Single power supply Dual power supplies Symbol VCC VCC, VEE RL Limits 5 ~ 32 2.5 ~ 16 2 k Min. Unit V V *Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 15V, VEE = - 15V) Parameter Quiescent circuit current Input offset voltage Input offset current Input bias current High-amplitude voltage gain Common-mode input voltage Common-mode rejection ratio Power supply voltage rejection ratio Maximum output voltage Slew rate Gain band width product Input conversion noise voltage Crosstalk between A-B Total harmonic distortion Channel separation Not designed for radiation resistance. Symbol IQ Vio Iio Ib Avol Vicm CMRR PSRR VOH / VOL SR GBW Vn CTA-B THD CS Min. -- -- -- -- 86 12 70 76 12 10 -- -- -- -- -- -- Typ. 4.6 0.5 5 50 110 14 90 90 14 13 2.4 6.5 2.0 85 0.0015 120 Max. 8.0 5.0 200 500 -- -- -- -- -- -- -- -- -- -- -- -- Unit mA mV nA nA dB V dB dB V V V / s MHz Vrms dB % dB RS RS RL RL 1 Conditions VIN = 0, RL = SW pin open RS 10k -- 2k, Vo = 10V -- 10k 10k 10k 2k 2k RL GV = 0dB, RL f = 10kHz RL = 2k. B. P. F = 20 ~ 30kHz f = 1kHz f = 1kHz, Vo = 5Vrms f = 1kHz, input conversion 1 Because the first stage is configured with a PNP transistor, input bias current is from the IC. 2 Standard ICs BA3129 / BA3129F 8 VCC *Operation notes (1) Using SW pins The Pin 6 and Pin 9 SW pins control switching of the dual-system differential input amplifier. When the current flowing from the SW pins is detected, the differential input amplifier is switched. If no current is flowing from the SW pins, the A amplifier is activated, and if current of 20A or higher is flowing, the B amplifier is activated. The pin voltage is V = VCC - (5 x 103 + 10 x 103) I - 0.7. Thus, R1 and R2 are set so that when the switch is off, the switching current is 1A or lower, and when the switch is on, the switching current is 20A or higher. 5k R1 6/9 10k SW Circuit 1 A R2 SW OFF: A-amp function ON : B-amp function Fig.1 *Application example 0.22 IN1A 47k 2.2k 2 22k 0.22 IN1B 47k 4 2.2k 1 OUT1 5.6k 5 10 5.6k 3 12 47k 13 22k 0.22 IN2B 2.2k 1 14 47k 0.22 IN2A BA3129 BA3129F 11 2.2k 1 OUT2 + 6 12k 7 9 12k 8 + 12k 16 16 12k 100k VCC = 12V SW OFF: A amp SW ON : B amp A amp: GV = 20dB B amp: GV = 10dB 47k SW 0.22 Fig.2 When the switch is off, Pins 6 and 9 are open, resulting in high impedance. To guard against induction noise and other adverse effects, we recommend using a pullup resistance. 3 Standard ICs BA3129 / BA3129F *External dimensions (Units: mm) BA3129 19.4 0.3 6.5 0.3 14 8 14 6.2 0.3 4.4 0.2 BA3129F 8.7 0.2 8 1 0.51Min. 4.25 0.3 7 7.62 1.5 0.1 1 7 3.2 0.2 0.3 0.1 0.11 2.54 0.5 0.1 0 ~ 15 1.27 0.4 0.1 0.3Min. 0.15 DIP14 SOP14 4 0.15 0.1 |
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