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U4254BM

Low-Noise AM/FM Antenna Impedance Matching IC

Description

The U4254BM is an integrated low-noise AM/FM

antenna impedance matching circuit in BICMOS

technology. The device is designed in particular for car

application and is suitable for windscreen and roof

antennas.

Features

D

D

D

D

High dynamic range for AM and FM

Integrated AGC for FM

High intercept point 3rd order for FM

FM amplifier adjustable to various cable impedance

D

High intercept point 2nd order for AM

D

Low noise output voltage

D

Low power consumption

Block Diagram

FMIN

GND1

FMGAIN

AGC

VS

1

2

3

4

14

5

I

AGC

FM

15

FMOUT

AGC

13

AGCADJ

VREF2

VREF

12

VREF1

11

AMIN

8

AMOUT1

AMOUT

AM

7

10

13932

GND2

Figure 1. Block diagram

TELEFUNKEN Semiconductors

Rev. A1, 08-Jul-97

1 (12)

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