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.

July 1998

T

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

®

HYST2

TIM

CCE

CE3

CE2

MICOUT

CE1

INE

VREF

1

3

2

4

5

6

7

8

9

INR

RECOUT

CR1

CR3

CR2

CCR

AMP IN

AMP SUP

VOL

23

22

21

20

19

17

18

16

15

D93TL005

10

11

12

13

14

28

27

26

25

24

GND

CS

OUTE

ATTE

HYST1

ATR

ATTR

OUTR

IREF

V+

PIN CONNECTION (top view)

SO28

ORDERING NUMBERS:

TEA7540FP

1/12