TEA7540 ST Microelectronics, Inc., TEA7540 Datasheet - Page 5

• Manufacturer Part Number: TEA7540
• Description: Handsfree Controller
• Manufacturer: ST Microelectronics, Inc.

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
Figure C: Application Diagram (Example of high range telephone set using TEA7540).
ABSOLUTE MAXIMUM RATINGS
Symbol
Top
T
V
stg
+
Supply Voltage
Operating Temperature
Storage Temperature Range
Parameter
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.
-65 to 125
-20 to 70
Value
12
TEA7540
Unit
V
C
C
5/13