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Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
Typical Operating Characteristics (continued)
(MAX2120 Evaluation Kit: V CC = +3.3V, baseband output frequency = 5MHz; V GC1 = 1.2V; T A = +25°C. Default register settings
except BBG[3:0] = 1011.)
PHASE NOISE vs. OFFSET FREQUENCY
LO LEAKAGE vs. LO FREQUENCY
-60
f LO = 1800MHz
-70
MEASURED AT RF INPUT
-70
-80
-75
-90
-80
-100
-110
-120
-130
-85
-90
0.1
1
10
100
1000
925
1175
1425
1675
1925
2175
OFFSET FREQUENCY (kHz)
LO FREQUENCY (MHz)
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
NAME
VCC_RF2
VCC_RF1
GND
RFIN
GC1
VCC_LO
VCC_VCO
VCOBYP
VTUNE
GNDTUNE
GNDSYN
CPOUT
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 the board’s ground plane for proper operation.
Wideband 75 ? RF Input. Connect to an RF source through a DC-blocking capacitor.
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.
Internal VCO Bias Bypass. Bypass to GND with a 100nF capacitor connected as close as possible to
the pin. Do not share capacitor ground vias with other ground connections.
High-Impedance VCO Tune Input. Connect the PLL loop filter output directly to this pin with as short
of a connection as possible.
Ground for VTUNE. Connect to the PCB ground plane.
Ground for Synthesizer. Connect to the PCB ground plane.
Charge-Pump Output. Connect this output to the PLL loop filter input with the shortest connection
possible.
8
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