MAX12000 Datasheet, PDF (5/9 Pages) Maxim Integrated Products – 1575MHz GPS Front-End Amplifier

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