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U4050B

TEMIC Semiconductors
Part Number U4050B
Manufacturer TEMIC Semiconductors
Description Speech Circuit
Published Jul 14, 2008
Detailed Description U4050B Speech Circuit with Line-Powered Loudspeaker Amplifier Description The electronic speech circuit U4050B is a line...
Datasheet PDF File U4050B PDF File

U4050B
U4050B


Overview
U4050B Speech Circuit with Line-Powered Loudspeaker Amplifier 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 components necessary for amplification of signals and adaptation to the line.
An integrated loudspeaker amplifier allows loudhearing operation.
Features www.
DataSheet4U.
com 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 compensation 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 mA Benefits D Independent adjustment of transmit gain, receive gain and sidetone suppression D Low number of external components Block Diagram GS 9 MICO 7 TIN 15 ST 4 + GR 2 – + RECO1 3 RECO2 1 DTMF MIC1 MIC2 8 – 10 11 + – SAI 26 GSA SAO CLISA AGA CK VL RDC VC SA 21 LIMSA LEVSQ CSQ 12 13 17 27 6 SQUELCH TXA AGA REC.
ATT.
23 LIMITER NSA MUTE 5 16 25 Power supply 19 U4050B 24 22 28 18 14 20 CLIM MUTE PD GND IREF SWAMP VM VD Figure 1.
Block diagram Ordering Information Extended Type Number U4050B-AFL U4050B-AFLG3 Package SO28 SO28 Remarks Taped and reeled Rev.
A2, 05-Mar-98 1 (18) www.
DataSheet4U.
com U4050B Block Diagram / Application Circuit With a squelch function, acoustical feedback during loudhearing can be reduced significantly.
The generated 2 (18) CNW2 22n RNW3 VM Sidetone network 3.
3k RNW2 1k + CGR 2.
2 m C...


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