ATR4251 Datasheet PDF - ATMEL Corporation

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ATR4251
ATMEL Corporation

Part Number ATR4251
Description High-dynamic-range Antenna Amplifier IC
Page 21 Pages


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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
AGC1
2
3
BAND
GAP
AGC
VS
17
AGCCONST
16
AGC2
4
VREF4
15
VREF2
AMIN
5
6
AM
78
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.
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Low-noise,
High-dynamic-
range AM/FM
Antenna
Amplifier IC
ATR4251
4913J–AUDR–10/09



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Figure 1-2. Block Diagram SSO20 Package
FMGAIN 1
FMIN 2
VREF1 3
GND 4
AGC1 5
AGC2 6
VREF2 7
AMIN1 8
CREG 9
AGCAMIN 10
FM
amplifier
AGC
Band
gap
AM
AGC
(AM)
SSO20
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20 GND2
19 FMOUT
18 AGCIN
17 VS
16 AGCCONST
15 VREF4
14 AMOUT1
13 GND1
12 TCONST
11 AGCAM
2 ATR4251
4913J–AUDR–10/09



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2. Pin Configuration
Figure 2-1. Pinning QFN24
NC
GND
AGC1
AGC2
VREF2
AMIN
24 23 22 21 20 19
1 18
2 17
3 16
4 15
5 14
6 13
7 8 9 10 11 12
NC
VS
AGCCONST
VREF4
AMOUT1
GND1
ATR4251
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Table 2-1.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Paddle
Pin Description QFN24
Symbol
Function
NC Pin must not be connected to any other pin or supply chain except GND.
GND
Ground FM
AGC1
AGC output for pin diode
AGC2
AGC output for pin diode
VREF2
Reference voltage for pin diode
AMIN
AM input, impedance matching
NC Pin must not be connected to any other pin or supply chain except GND.
CREG
AM - AGC time constant capacitance 2
AGCAMIN AM - AGC input
AGCAM
AM - AGC output for pin diode
TCONST AM - AGC - time constant capacitance 1
NC Pin must not be connected to any other pin or supply chain except GND.
GND1
Ground AM
AMOUT1 AM output, impedance matching
VREF4
Bandgap
AGCCONST FM AGC time constant
VS Supply voltage
NC Pin must not be connected to any other pin or supply chain except GND.
AGCIN
FM AGC input
FMOUT
FM output
GND2
Ground
FMGAIN
FM gain adjustment
FMIN
FM input
VREF1
Reference voltage 2.7V
GND
Ground Paddle
4913J–AUDR–10/09
3



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Figure 2-2. Pinning SSO20
FMGAIN 1 20 GND2
FMIN 2 19 FMOUT
VREF1 3 18 AGCIN
GND 4 17 VS
AGC1 5 16 AGCCONST
AGC2 6 15 VREF4
VREF2 7 14 AMOUT1
AMIN1 8 13 GND1
CREG 9 12 TCONST
AGCAMIN 10 11 AGCAM
Table 2-2.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin Description SSO20
Symbol
Function
FMGAIN
FM gain adjustment
FMIN
FM input
VREF1
Reference voltage 2.7V
GND
FM ground
AGC1
AGC output for PIN diode
AGC2
AGC output for PIN diode
VREF2
Reference voltage for PIN diode
AMIN1
AM input, impedance matching
CREG
AM AGC constant capacitance 2
AGCAMIN AM input, AM AGC
AGCAM
AM AGC output for PIN diode
TCONST AM AGC constant capacitance 1
GND1
AM ground
AMOUT1 AM output, impedance matching
VREF4
Band gap 6V
AGCCONST FM AGC constant
VS Supply voltage
AGCIN
FM AGC input
FMOUT
FM output
GND2
FM ground
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4 ATR4251
4913J–AUDR–10/09



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