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U4030B

Telephone Speech Circuit

Temic Semiconductors 

Telephone Speech Circuit

U4030B

Description

The U4030B is an electronic speech circuit for standard

and feature telephones. It replaces the hybrid transformer,

earphone and microphone interface and the supply

voltage generation for external components, e.g. dialer or

microcomputers. Using the U4030B in telephone circuit

designs can improve transmission quality and results in

cost savings through shorter and more flexible design

procedures. It reduces the amount of external components

needed. The U4030B uses TEMIC’s reliable bipolar

technology and is offered in a SO20 package.

Features

D Microphone amplifier with

– Symmetrical input

– Privacy function

– Anticlipping

D Built in ear protection

D Power down input

D Mute input

D DTMF interface

D Low line impedance during pulse dialing

Benefits

D Independent adjustment of

– Transmission gain

– Receiving gain

– Sidetone suppression

– Frequency response

D Low-impedance supply voltage for all external blocks

D Supply voltage for an electret microphone

Applications

D Standard telephone

D Fax machine

D Answering machine

D Cordless telephone

Block Diagram

10

DTMF

PRIV

16

12

MIC1

MIC2

13

GT MICO

ST

11

9

5

+

–

–

+

TXA

GR

RECO

6

7

+–

Ear protection

REC.ATT.

4 CK

Limiter

Mute

3

8

17

CLIM

MUTE

PD

Power supply

U 4030 B

14

GND

18 1

SWAMP VM

15 VL

19 RDC

2 VC

20

VD

Figure 1.

Ordering Information

93 7618 e

Extended Type Number

U4030B-AFL

U4030B-AFLG3

Package

SO20

SO20

Remarks

Taped and reeled

Rev. A2, 27-Jan-98

1 (14)

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