"The integrated circuit, U4083B, is a low power audio amplifier for a telephone loudspeaker. It has differential speaker outputs to maximise the output swing at low supply voltages. There is no need for coupler capacitors.The U4083B has an open loop gain of 80 dB whereas the closed loop gain is adjusted with two external resistors. Achip disable pin permits powering down and/or mutingthe input signal.

Features

Wide operating voltage range: 2 to 16 V
Battery powered application due to low quiescent supply current: 2.7 mA typical
Chip disable input to power down the integrated circuit
Low power down quiescent current
Drives a wide range of speaker loads
Output Power, Po= 250 mW @ RL= 32W(speaker)
Low harmonic distortion (0.5% typical)
Wide range gain adjustable: 0 dB to 46 dB

Benefits

Low number of external components
Low current consumption "