U4050B Datasheet | TEMIC Semiconductors

Description The electronic speech circuit U4050B is a linear integrated circuit for use in telephone sets. It replaces the hybrid transformer, sidetone equivalent and ear protection rectifiers. The circuit is line powered and contains all ponents necessary for amplification of signals and adaptation to the line. An integrated loudspeaker amplifier allows loudhearing operation. Features .. D Integrated amplifier for loudhearing operation D Anticlipping for loudspeaker amplifier D Supply voltages for all functional blocks of a subscriber set D Adjustable DC characteristics D Adjustable sending and receiving amplification D Automatic line loss pensation D Symmetrical output of earpiece amplifier D Built-in ear protection D Symmetrical input of microphone amplifier D Adjustable sidetone suppression independent of sending and receiving amplification D DTMF and MUTE inputs D Anticlipping in transmit direction D Squelch D Integrated transistor for short circuiting the line voltage D Power down D Operation possible at line currents above 10 m A Benefits D Independent adjustment of transmit gain, receive gain and sidetone suppression D Low number of external ponents Block Diagram MICO 4 + - + RECO1 RECO2 DTMF MIC1 MIC2 - 10 11 + - SAI GSA SAO CLISA AGA CK VL RDC VC LIMSA LEVSQ CSQ 12 13 17 27 6 SQUELCH AGA REC. ATT. LIMITER NSA MUTE 5 16 25 Power supply 24 22 28 18 14...