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).

Symbol

Parameter

Value

Unit

V

+

Supply Voltage

12

V

Top

Operating Temperature

-20 to 70

°C

Storage Temperature Range

-65 to 125

°C

ABSOLUTE MAXIMUM RATINGS

TEA7540

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