PBL38573

PBL 38573 is a monolithic integrated speech transmission circuit for use in electronic telephones. PBL38573 is intended specially for telephone lines with constant current feed. Maximum line current less than 130 mA in DIL package (100 mA in SO package). It is designed to accomodate either a low impedance dynamic or an electret microphone. A signal summing point at the transmitter input of PBL38573 is available for DTMF dialler- and possible monitor or handsfree signals. An available internally of PBL38573 preset line length compensation can be adjusted or shut off in low gain mode with external resistors.

Application dependent parameters of PBL38573 such as line balance, side tone level, transmitter and receiver gains of PBL38573 and frequency responces are set independently by external components which means an easy adaption to various market needs. The setting of the parameters if carried out in certain order will counteract the interaction between the settings. A DCsupply is provided to feed microphones and diallers.