4

9194CS–AUDR–10/10

Atmel ATR4253

3.3

Supply Voltage Regulator

The driving voltage for an external power transistor is provided by an integrated regulator

circuit.

An overvoltage protection circuit detects overvoltage condition and switches off the amplifier

and AGC circuit in order to reduce current consumption and avoid thermal overload.

3.4

Antenna Sensor

The Atmel

connected to the amplifier module. If no antenna is detected, the amplifier and AGC circuit are

switched off to signal this error via supply current reduction to the unit that provides and moni-

tors the supply current for the antenna amplifier (e.g., the car radio).