ATR4252 Datasheet, PDF (1/10 Pages) ATMEL Corporation – All-in-One IC Solution for Active Antennas

Features
• Highly Integrated - All-in-one Active Antenna IC
• Integrated AGC for AM and FM
• Integrated Driver for AM and FM PIN Diodes
• Integrated Power Supply Regulator
• Integrated Antenna Sensor
• Separated AM LNA, AM Buffer and FM Amplifier
• High Dynamic Range for AM and FM
• Excellent Noise Performance
• 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
• Only Small Capacitor Values Necessary at AM AGC
• Large AM Frequency Range to Cover DRM Broadcast Signals
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
AM LNA
FM
BIAS REF AMPD GND2 BIAS
22
21
20
19
18
FMB
17
FME FMPD
16
15
AM LNA IN 23
AM
LNA
AM LNA
SOURCE
24
CASCODE
FILTER
25
Voltage
Supply
FM
Amplifier
AGC
(FM)
14 FMC
13 FMDET
12 FMTC
AM LNA OUT 26
11 VS
AMBIAS 27
AMBUF IN 28
AM
Buffer
Antenna
Detect
Over
Voltage
AGC
(AM)
10 AMOUT
9 GND1
1
2
3
4
5
6
7
8
ANTENNA VS VSTART OVDET VREGO AMTC1 AMTC2 AMDET
SENSE FILTER
All-in-One IC
Solution for
Active
Antennas
ATR4252
Summary
Preliminary
NOTE: This is a summary document.
The complete document is available
under NDA. For more information,
please contact your local Atmel sales
office.
9154AS–AUDR–09/09