Description
TELEFUNKEN microelectronic’s one chip telephone circuit, U 3750 BM, is BICMOS integrated circuit that performs all the speech and line interface functions required in an electronic telephone set, the tone ringer, the pulse and DTMF dialling with redial, a keyboard interface with the possibility to interface with an external microcontroller using the internal serial bus, and a power supply for peripherals.
Features
- D Adjustable dc slope characteristic D Adjustable automatic line length receiving and sending gain control (not used in DTMF) with the possibility of fixed gain (PABX) D Adjustable dynamic impedance D Stabilized power supply for peripherals D Confidence level during pulse and DTMF dialling D Receiving amplifier for dynamic or piezo-electric ear pieces D High-impedance microphone inputs (80 kW in symmetrical and 40 kW in asymmetrical) suitable for dynamic, magnetic, piezo-electric or electret mic.
U3750BM_TEMICSemiconductors.pdf
