NOTE: This is a summary document.

The complete document is available

under NDA. For more information,

please contact your local Atmel sales

office.

Features

1.

Description

The ATR4252 is a highly integrated high performance AM/FM antenna amplification

IC with several features. The device has built-in AGC's for both AM and FM, antenna

detection, a power supply regulator as well as additional pre-integrated peripherals.

The ATR4252 is based on BICMOS technology. The device is designed in particular

for car application and is suitable for active antennas located in several positions on

the car such as bumpers, windscreen, mirrors or windows.

Figure 1-1.

Block Diagram

23

1

2

3

4

5

6

7

8

22

AM

Buffer

AM

LNA

24

25

26

27

28

14

13

12

11

10

9

21

20

Voltage

Supply

VREGO

AMTC2

AMTC1

AMDET

OVDET

VSTART

VS

FILTER

ANTENNA

SENSE

FMB

FME

FMPD

GND2

CASCODE

FILTER

AM LNA

SOURCE

AMBUF IN

AMBIAS

AM LNA OUT

FMDET

GND1

AMOUT

VS

FMTC

FMC

AM LNA IN

AMPD

REF

FM

BIAS

AM LNA

BIAS

19

18

17

16

15

AGC

(FM)

FM

Amplifier

AGC

(AM)

Over

Voltage

Antenna

Detect

All-in-One IC

Solution for

Active

Antennas

ATR4252

Summary

Preliminary

9154AS–AUDR–09/09