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