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1575MHz GPS Front-End Amplifier
Typical Operating Characteristics (continued)
(P IN = -40dBm, f IN = 1575MHz, inputs and outputs are terminated to 50 ? , V CC = +5.0V, T A = +25°C, unless otherwise noted.)
-32
-34
AMP 1 S12
-20
-24
AMP 2 S12
-28
-36
-32
-38
-36
-40
-40
800
1000
1200
1400
1600
1800
2000
800
1000
1200
1400
1600
1800
2000
FREQUENCY (MHz)
FREQUENCY (MHz)
Pin Description
PIN
1
2, 3, 8, 9
4
5
6
7
10
EP
NAME
RFIN2
GND
EXTCAP/
ALT_V CC
RFOUT2/V CC
RFIN1
GAIN_SELECT
RFOUT1
Exposed Pad
FUNCTION
Amplifier 2 Input. Incorporates an internal DC-blocking capacitor and is internally matched to 50 ? .
This input is designed to be connected to a bandpass filter.
Electrical Ground
External Smoothing Capacitor for Internal Supply Voltage or Can Be Used as the External DC Supply
Pin to Eliminate the Need for a Bias-T on Pin 5
Amplifier 2 Output. Incorporates an internal DC-blocking capacitor and is internally matched to 50 ? .
DC bias on this pin serves as the power supply through a bias-T.
Amplifier 1 Input. Requires external DC-blocking capacitor and matching components.
AMP 2 Gain Select. Open is high-gain mode. Short to ground is low-gain mode.
Amplifier 1 Output. Incorporates an internal DC-blocking capacitor and is internally matched to 50 ? .
This output is designed to drive a bandpass filter.
Ground. The exposed pad must be soldered to the circuit board for proper thermal and electrical
performance.
_______________________________________________________________________________________
5
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