ATR4251_09 Datasheet, PDF (3/21 Pages) ATMEL Corporation – Low-noise, High-dynamic-range Antenna Amplifier IC

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
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
3
4913J–AUDR–10/09