LS285A Datasheet - SGS

LS285A TELEPHONE SPEECH CIRCUITS

LINEAR INTEGRATED CIRCUITS TELEPHONE SPEECH CIRCUITS The LS285 and LS285A are monolithic integrated circuits for replacement of the hybrid circuit (2-4 wire interface) in conventional telephones interfacing the two transducers to the line and providing a controlled amount of sidetone. The same type of transducer can be used for both transmitter and receiver, usually a 3500 dynamic type. By sensing the line current, LS285 and LS285A adjust the gain in both directions to compensate for line atten.

LS285A-SGS.pdf