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Complete Direct-Conversion L-Band Tuner
Pin Configuration
TOP VIEW
28
27
26
25
24
23
22
V CC_RF2
1
21
IDC+
+
V CC_RF1
GND
2
3
20
19
IOUT-
IOUT+
MAX2121
RFIN
GC1
4
5
18
17
QOUT-
QOUT+
V CC_LO
V CC_VCO
6
7
EP
16
15
V CC_DIG
REFOUT
8
9
10
11
12
13
14
TQFN
(5mm x 5mm)
Pin Description
PIN
1
2
3
NAME
V CC_RF2
V CC_RF1
GND
FUNCTION
DC Power Supply for LNA. Connect to a +3.3V low-noise supply. Bypass to GND with a 1nF capacitor
connected as close as possible to the pin. Do not share capacitor ground vias with other ground connections.
DC Power Supply for LNA. Connect to a +3.3V low-noise supply. Bypass to GND with a 1nF capacitor
connected as close as possible to the pin. Do not share capacitor ground vias with other ground connections.
Ground. Connect to board’s ground plane for proper operation.
4
RFIN
Wideband 75
RF Input. Connect to an RF source through a DC-blocking capacitor.
5
6
7
GC1
V CC_LO
V CC_VCO
RF Gain-Control Input. High-impedance analog input with a 0.5V to 2.7V operating range.
V GC1 = 0.5V corresponds to the maximum gain setting.
DC Power Supply for LO Generation Circuits. Connect to a +3.3V low-noise supply. Bypass to GND
with a 1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias
with other ground connections.
DC Power Supply for VCO Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with a 1nF
capacitor connected as close as possible to the pin. Do not share capacitor ground vias with other
ground connections.
8
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