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Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
Pin Description
PIN
1, 3, 8,
11, 12, 14
2
4
5, 15
6
7
9
10
13
16
NAME
GND
LNAIN
GAIN
V CC
SHDN
LO
IFOUT-
IFOUT+
MIXIN
LNAOUT
FUNCTION
Ground. Connect to ground plane with a low-inductance connection.
RF Input to LNA and LNA Bypass Switch. Requires an external matching network and a series
DC-blocking capacitor.
Gain Control Logic-Level Input. Drive high to enable the LNA, open the LNA bypass switch, and
increase the receiver’s gain. Drive low to disable the LNA, close the LNA bypass switch, and reduce
the receiver’s gain.
Supply Voltage. Bypass V CC to GND at each pin with a 47pF capacitor as close to the pin as possible.
Shutdown Control Logic-Level Input. Drive high or connect to V CC for normal operation. Drive low to
place the device in low-power shutdown mode.
Local-Oscillator Input to Downconverter Mixer. Requires a series DC-blocking capacitor and an imped-
ance-setting resistor (typically 75 ? to ground).
Inverting Side to Downconverter Mixer’s Differential Open-Collector IF Output. Requires a pull-up induc-
tor to V CC for proper biasing, as well as a matching network to ensure optimum output power.
Noninverting Side of Downconverter Mixer’s Differential Open-Collector IF Output. Requires a pull-up
inductor to V CC for proper biasing, as well as a matching network to ensure optimum output power.
RF Input to Downconverter Mixer. Requires an external matching network and series DC-blocking
capacitor.
LNA Output. Internally matched to 50 ? . LNAOUT has an internal blocking capacitor.
300pF
LNA
INPUT
0.1 μ F
12nH
1
2
GND
LNAIN
LNAOUT
V CC
16
15
V CC
LNA
OUTPUT
880MHz
3
GND
GND
14
47pF
GAIN-
CONTROL
INPUT
V CC
47pF
4
5
GAIN
V CC
MAX2685
MIXIN
GND
13
12
3.3pF
300pF
6pF
MIXER
INPUT
880MHz
SHUTDOWN
INPUT
6
SHDN
GND
11
12pF
LO
INPUT
960MHz
75 ?
330pF
7
8
LO
GND
IFOUT+
IFOUT-
10
9
R*
680nH
820nH
IF
OUTPUT
80MHz
V CC
1000pF
6pF
*OPTIONAL FOR BROADBAND MATCH.
Figure 1. Typical Operating Circuit
6
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