U4037B 데이터 시트보기 (PDF) - Temic Semiconductors

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U4037B

Low Voltage Speech Circuit with Tone Ringer Interface

Temic Semiconductors 

U4037B

Block Diagram / Applications

Tip

Ring

620 W

DTMF

RDC

22 mF

VI

SWAMP

AGC

MUTE

MIC1 MIC2 MICO

Microphone –

amplifier +

Mute control

Supply current

regulator

AGC current

generator

TIN

Control

function

Transmit

amplifier VL

Sidetone

amplifier

ST

Receiver

attenuation RECIN

Receiving

amplifier

RECO1

RECO2

VDD

VOL1

VOL2

MELI

Receive volume

control

Ringer volume

control

GND

Supply

Bandgap

reference

Comparator

with hysteresis

VB

OUT

9879

RFO

to mC

Figure 1. Block diagram

2 (6)

TELEFUNKEN Semiconductors

Preliminary Information

Rev. A1, 08-Oct-96

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