Low Power Audio Amplifier

The 34119 is a low power audio amplifier integrated circuit intended 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.

Features

• 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

• Pb-Free Packaging Designated by Suffix Code EF