U4083 - TEMIC Semiconductors

U4083 Low-Power Audio Amplifier for Telephone Applications

The integrated circuit, U4083B, is a low power audio amplifier for a telephone loudspeaker. It has differential speaker outputs to maximize 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. A chip disable pin permits.

Features

D Wide operating voltage range: 2 to 16 V D Battery powered application due to low quiescent supply current: 2.7 mA typical D Output Power, Po = 250 mW @ RL = 32 W (speaker) D Low harmonic distortion (0.5% typical) D Wide range gain adjustable: 0 dB to 46 dB D Chip disable input to power down the integrated circuit Benefits D Low number of external components D Low current consumption D Low power down quiescent current D Drives a wide range of speaker loads Block Diagram / Application Circuit 0.1mF Input Ci 1mF 75 k W Ri 3 kW Rf 4 Vi FC1 3 C1 5mF 50 k W 2 125 kW 50 k W
  – + Amp.1 5 4 kW VO.