Philips Electronics
Hands free IC
Unisonic Technologies
LOW VOLTAGE TELEPHONE TRANSMISSION CIRCUIT WITH DIALLER INTERFACE
Philips Electronics
Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting
Philips Electronics
Hands-free IC
Philips Electronics
Speech and loudspeaker amplifie IC with auxiliary inputs/outputs and analog multiplexer
Philips Electronics
Listening-in circuit for line-powered telephone sets
Philips Electronics
Low voltage transmission circuits with dialler interface