TEA7540 データシートの表示（PDF） - STMicroelectronics

部品番号

コンポーネント説明

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TEA7540

MONITOR AMPLIFIER

STMicroelectronics 

®

TEA7540

HANDSFREE CONTROLLER

NOISE/SPEECH DISCRIMINATION IN EMIS-

SION AND RECEPTION

INTEGRATED SIGNAL GAIN COMPRESSOR

IN BOTH MODES

PROGRAMMABLE ATTENUATORS IN BOTH

MODES

ADAPTED TO ACOUSTIC PARAMETERS OF

ALL CABINETS

LOW OPERATING VOLTAGE 2.5V

LOW OPERATING CURRENT 2.1mA

CHIP SELECT BETWEEN HANDSFREE AND

MONITORING MODES

DESCRIPTION

This 28 pins IC is an innovative approach to quality

handsfree telephone sets. It results from an extensive

research on speech signal.

PIN CONNECTION (top view)

SO28

ORDERING NUMBERS: TEA7540FP

GND

CS

OUTE

ATTE

HYST1

HYST2

TIM

CCE

CE3

CE2

CE1

MICOUT

INE

VREF

1

28

2

27

3

26

4

25

5

24

6

23

7

22

8

21

9

20

10

19

11

18

12

17

13

16

14

15

D93TL005

V+

IREF

OUTR

ATTR

ATR

VOL

AMP SUP

AMP IN

CCR

CR3

CR2

CR1

RECOUT

INR

July 1998

1/12

T

is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without

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