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PDF TEA7540FP Data sheet ( Hoja de datos )
| Número de pieza | TEA7540FP | |
| Descripción | HANDSFREE CONTROLLER | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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® 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
1 page  
TEA7540
TEA7540 OPERATION
TEA7540 is powered through an external shunt
regulator (for instance the shunt regulator of the
monitor amplifier TEA7532) or an external zener
diode.
It can work at a very low voltage (2.5V) over the
circuit and it has a low current consumption
(2.1mA).
It’s also possible via the chip select pin (CS) to
put the handsfree function in standby to use the
circuit in monitoring mode with the handset micro-
phone.
TEA7540 is designed to work with all kind of mi-
crophone, including Electret.
TEA7540 also handles the handset microphone
signal (AMP IN) when the system is set to normal
conversation mode.
Figure C: Application Diagram (Example of high range telephone set using TEA7540).
ABSOLUTE MAXIMUM RATINGS
Symbol
V+
Top
Tstg
Parameter
Supply Voltage
Operating Temperature
Storage Temperature Range
Value
12
-20 to 70
-65 to 125
Unit
V
°C
°C
5/12
5 Page 
SO28 PACKAGE MECHANICAL DATA
DIM.
A
a1
b
b1
C
c1
D
E
e
e3
F
L
S
MIN.
0.1
0.35
0.23
17.7
10
7.4
0.4
mm
TYP.
0.5
1.27
16.51
MAX.
2.65
0.3
0.49
0.32
MIN.
0.004
0.014
0.009
45° (typ.)
18.1 0.697
10.65
0.394
7.6 0.291
1.27 0.016
8° (max.)
TEA7540
inch
TYP.
0.020
0.050
0.65
MAX.
0.104
0.012
0.019
0.013
0.713
0.419
0.299
0.050
0016572
11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TEA7540FP.PDF ] | |
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