MC34119P

低功耗音频放大器

Low Power Audio Amplifier

The MC34119 is a low power audio amplifier intergrated circuit intended primarily for telephone applications, such as in speakerphones. It provides differential speaker outputs to maximize output swing at low supply voltages 2.0 V minimum. Coupling capacitors to the speaker are not required. Open loop gain is 80 dB, and the closed loop gain is set with two external resistors. A Chip Disable pin permits powering down and/or muting the input signal. The MC34119 is available in standard 8–pin DIP, SOIC package, and TSSOP package.

• Wide Operating Supply Voltage Range 2.0 V to 16 V, Allows Telephone Line Powered Applications

• Low Quiescent Supply Current 2.7 mA Typ for Battery Powered Applications

• Chip Disable Input to Power Down the IC

• Low Power–Down Quiescent Current 65 µA Typ

• Drives a Wide Range of Speaker Loads 8.0 Ω and Up

• Output Power Exceeds 250 mW with 32 Ω Speaker

• Low Total Harmonic Distortion 0.5% Typ

• Gain Adjustable from <0 dB to >46 dB for Voice Band

• Requires Few External Components