آی سی U3760MB

Low-voltage Standard Telephone Circuit

TEMIC's low-voltage telephone circuit, U3760MB, performs all the speech and line interface functions required in an electronic telephone set tone ringer, pulse and DTMF dialing with redial. Electrostatic sensitive device. Observe precautions for handling.

Features

Speech Circuit D Adjustable dc characteristic D Symmetrical input of microphone amplifier D Receiving amplifier for dynamic or piezo-electric

Selectable flashing duration by key pad Pause function Last number redial to 32 digits Standard low-cost 3.58-MHz crystal or ceramic resonator

D Two-tone ringer D Adjustable volume D RC oscillator D Adjustable threshold

D Low number of external components D High quality through one-IC solution D One IC for all standards

220 k HKS Tip 5M 75V HKS n 2n2 HKS Microphone ­ amplifier + Control function 2.4 k Sidetone amplifier 3n3 ST Pulse control logic Supply current regulator Control function Receiver attenuation RECIN 2.2 m Receiving amplifier 100 RECO2 AGC 12 k RDC 39 VBG W VI VRING Supply Power-on-reset VRIAC OUT Tone signal generator n EP Mute control Transmit amplifier VL 680 MODE VDD2 VDD1 MFO MIC1 MIC2 MICO TIN n 5k

AGC current generator D/A converter Data latch & decoder ROW & column programmable counter Clock signal oscillator Divider Bandgap reference Comparator with hysteresis

https://www.digchip.com/datasheets/parts/datasheet/779/U3760MB-pdf.php