9258E-AUDR-11/14
Features
● High dynamic range for AM and FM
● Integrated AGC for AM and FM
● High intercept point 3rd order for FM
● FM amplifier adjustable to various cable impedances
● High intercept point 2nd and 3rd order for AM
● Low noise output voltage
● Low power consumption
● Low output impedance AM
ATR4251C
Low-noise, High-dynamic-range AM/FM Antenna
Amplifier IC
DATASHEET
ATR4251C [DATASHEET]
9258E–AUDR–11/14
2
1. Description
The Atmel
®
ATR4251C is an integrated low-noise AM/FM antenna amplifier with integrated AGC in BiCMOS2S technology.
The device is designed in particular for car applications, and is suitable for windshield and roof antennas.
Figure 1-1. Block Diagram QFN24 Package
Figure 1-2. Block Diagram SSO20 Package
CREG
NC*
NC*
Paddle = GND
AGCCONST
AMOUT1
GND1
VREF4
VS
NC*
AGC1
VREF2
AMIN
AGC2
GND
NC*T
CONST
AGC
AM
AGC
(AM)
AGC
AMIN
VREF1
FM
IN
AGC
IN
FM
GAIN
FM
OUT
GND2
FM
amplifier
81012119
5
3
4
1
2
6
14
16
15
18
17
13
7
23 21 19202224
BAND
GAP
AM
AGC
* Pin must not be connected to any other pin or supply chain except GND.
FMIN
VREF1
GND
AGC1
AGC2
AGCAMIN
CREG
AMIN1
VREF2
FMGAIN
2
3
4
5
6
10
9
8
7
1
FMOUT
AGCIN
VS
AGCCONST
VREF4
AGCAM
TCONST
GND1
AMOUT1
GND2
19
18
17
16
AGC
(AM)
Band
gap
AGC
SSO20
FM
amplifier
15
11
12
13
14
20
AM