MAX2112ETI(2007) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX2112ETI Datasheet PDF : 19 Pages
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Complete, Direct-Conversion
Tuner for DVB-S2 Applications
Pin Description
PIN
NAME
DESCRIPTION
1
VCC_RF2
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.
2
VCC_RF1
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.
3
GND
Ground. Connect to board’s ground plane for proper operation.
4
RFIN
Wideband 75Ω RF Input. Connect to an RF source through a DC-blocking capacitor.
5
GC1
RF Gain-Control Input. High-impedance analog input with a 0.5V to 2.7V operating range.
VGC1 = 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
6
VCC_LO 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
7
VCC_VCO capacitor connected as close as possible to the pin. Do not share capacitor ground vias with other
ground connections.
8
VCOBYP 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.
9
VTUNE High-Impedance VCO Tune Input. Connect the PLL loop filter output directly to this pin with as short of a
connection as possible.
10
GNDTUNE Ground for VTUNE. Connect to the PCB ground plane.
11
GNDSYN Ground for Synthesizer. Connect to the PCB ground plane.
12
CPOUT
Charge-Pump Output. Connect this output to the PLL loop filter input with the shortest connection
p o ss i b l e .
DC Power Supply for Synthesizer Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with a
13
VCC_SYN 1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias with other
ground connections.
14
XTAL
Crystal-Oscillator Interface. Use with an external parallel-resonance-mode crystal through a series 1nF
capacitor. See the Typical Application Circuit.
15
REFOUT Crystal-Oscillator Buffer Output. A DC-blocking capacitor must be used when driving external circuitry.
DC Power Supply for Digital Logic Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with a
16
VCC_DIG 1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias with other
ground connections.
17
QOUT+
Quadrature Baseband Differential Output. AC-couple with 47nF capacitors to the demodulator input.
18
QOUT-
19
IOUT+
In-Phase Baseband Differential Output. AC-couple with 47nF capacitors to the demodulator input.
20
IOUT-
21
IDC+
I-Channel Baseband DC Offset Correction. Connect a 47nF ceramic chip capacitor from IDC- to IDC+.
22
IDC-
23
QDC+
Q-Channel Baseband DC Offset Correction. Connect a 47nF ceramic chip capacitor from QDC- to QDC+.
24
QDC-
DC Power Supply for Baseband Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with
25
VCC_BB 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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