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.

特性 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 ? and Up)

? Output Power Exceeds 250 mW with 32 ? Speaker

? Low Total Harmonic Distortion (0.5 Typ)

? Gain Adjustable from 46 dB for Voice Band

? Requires Few External Components

? Pb-Free Packaging Designated by Suffix Code EF