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ATR4251 Datasheet, PDF (1/21 Pages) ATMEL Corporation – Low-noise, High-dynamicrange AM/FM Antenna Amplifier IC | |||
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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
1. Description
The ATR4251 is an integrated low-noise AM/FM antenna amplifier with integrated
AGC in BiCMOS2S technology. The device is designed in particular for car applica-
tions, and is suitable for windshield and roof antennas.
Figure 1-1.
Block Diagram QFN24 Package
FM FM
FM AGC
VREF1 IN GAIN GND2 OUT IN
NC*
1
24
23
22
21
20
19
FM
amplifier
18
Paddle = GND
NC*
GND
2
AGC1
3
BAND
GAP
AGC
VS
17
AGCCONST
16
AGC2
4
VREF4
15
VREF2
5
AMIN
6
AM
7
8
AGC
(AM)
AMOUT1
14
GND1
13
9
10
11
12
NC* CREG AGC AGC T NC*
AMIN AM CONST
* Pin must not be connected to any other pin or supply chain except GND.
Low-noise,
High-dynamic-
range AM/FM
Antenna
Amplifier IC
ATR4251
4913IâAUDRâ03/08
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