U4092B - TEMIC Semiconductors

U4092B Monolithic Integrated Feature Phone Circuit

The µc controlled telephone circuit U4092B is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, tone ringer interface with dc/dc converter, sidetone equivalent and ear protection rectifiers. The circuit is line powered and contains all components necessary for amplification of signals .

Features

D DC characteristic adjustable D Transmit and receive gain adjustable D Symmetrical input of microphone amplifier D Anti-clipping in transmit direction D Automatic line loss compensation D Built-in ear protection D DTMF and MUTE input D Adjustable sidetone suppression independent of sending and receiving amplification D Integrated amplifier for loudhearing operation D Anti-clipping for loudspeaker amplifier D Improved acoustical feedback suppression D Power down D Voice switch D Tone ringer interface with dc/dc converter D Zero crossing detection D Common speaker for loudhearing and tone ringe.