(China (Mainland))
Product Summary
The PBL3786 is a bipolar integrated speech circuit for use in elec­tronic telephones. The PBL3786 is designed to operate at low supply voltages, down to 1.3V, making them usable when connected in parallel with other telephones. A differential-input microphone amplifier, permits the use of a dynamic microphone. Electret microphones (with built-in FET buffer amplifiers) may also be used. Gain regulation circuitry provides compensation for loop losses in both the transmit and receiver amplifiers. The receiver amplifier has a balanced push-pull output stage for good driving capabili­ties even at low supply voltages. The PBL 3781 is made to drive low impedance receivers. The PBL3786 has a higher impedance to the line. A straight-forward design procedure simplifies adaptation of the circuit to suit different transducers and battery feeding systems.
Parametrics
PBL3786 absolute maximum ratings: (1)Line current, TAmb = 70 ℃ Dual-in-line package: 150mA, Small Outline package: 130mA; (2)Line voltage continuous: 15 V, tp = 2 s: 18V, tD = 10 ms: 20V; (3)Power dissipation, TAmb = 70 ℃ Dual-in-line package: 1.5W, Small outline package: 1.3W; (4)Operating temperature range: -20 to +70℃; (5)Storage temperature range: -55 to +125℃.
Features
PBL3786 features: (1)AC voltage swing down to 0.4 V.; (2)Transmit and receive gain regulation for automatic loop loss compensation.; (3)Differential microphone input for dynamic microphone.; (4)Current generator output powers electret buffer amplifier or pulse dialler.; (5)Balanced receiver output stage.; (6)16-pin “batwing” DIP handles 1.5 W power dissipation.; (7)20-pin small outline package handles 1.3W power dissipation.
Diagrams
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