MAX2685EEE 查看數據表（PDF） - Maxim Integrated
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MAX2685EEE Datasheet PDF : 10 Pages
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Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
Pin Description
PIN
1, 3, 8,
11, 12, 14
2
NAME
GND
LNAIN
4
5, 15
6
7
9
10
13
16
GAIN
VCC
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 VCC 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 VCC 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 75Ω to ground).
Inverting Side to Downconverter Mixer’s Differential Open-Collector IF Output. Requires a pull-up induc-
tor to VCC 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 VCC 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 50Ω. LNAOUT has an internal blocking capacitor.
LNA
0.1µF
12nH
INPUT
880MHz
GAIN-
CONTROL
INPUT
VCC
47pF
SHUTDOWN
INPUT
LO
INPUT
960MHz
330pF
75Ω
1 GND
LNAOUT 16
300pF
2 LNAIN
3 GND
VCC 15
GND 14
4 GAIN
MIXIN 13
5 VCC MAX2685
6 SHDN
GND 12
GND 11
7
LO
IFOUT+ 10
R*
VCC
47pF
3.3pF
680nH
300pF
6pF
12pF
820nH
8 GND
9
IFOUT-
6pF
LNA
OUTPUT
MIXER
INPUT
880MHz
IF
OUTPUT
80MHz
VCC
1000pF
*OPTIONAL FOR BROADBAND MATCH.
Figure 1. Typical Operating Circuit
6 _______________________________________________________________________________________
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