Datasheet Summary
PBL 385 73 June 1999
PBL 385 73 Speech Circuit for constant current feeding systems
Description.
PBL 38573 is a monolithic integrated speech transmission circuit for use in electronic telephones. It 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 acodate either a low impedance dynamic or an electret microphone. A signal summing point at the transmitter input is available for DTMF dialler- and possible monitor or handsfree signals. An available internally preset line length pensation can be adjusted or shut off in low gain mode with external resistors. Application...