max2112ctit Maxim Integrated Products, Inc., max2112ctit Datasheet - Page 8

• Manufacturer Part Number: max2112ctit
• Description: Max2112 Complete, Direct-conversion Tuner For Dvb-s2 Applications
• Manufacturer: Maxim Integrated Products, Inc.

Complete, Direct-Conversion
Tuner for DVB-S2 Applications
8
8
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PIN
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
7
8
9
GNDTUNE
VCC_VCO
VCC_SYN
VCC_RF2
VCC_RF1
VCC_DIG
GNDSYN
VCOBYP
VCC_LO
REFOUT
VCC_BB
CPOUT
QOUT+
VTUNE
QOUT-
NAME
IOUT+
QDC+
IOUT-
QDC-
XTAL
IDC+
GND
RFIN
GC1
IDC-
DC Power Supply for LNA. Connect to a +3.3V low-noise supply. Bypass to GND with a 1nF capacitor
connected as close as possib l e to the pi n. D o not shar e capaci tor gr ound vi as w ith other g r ound 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 possib l e to the pi n. D o not shar e capaci tor gr ound vi as w ith other g r ound connections.
Ground. Connect to board’s ground plane for proper operation.
Wideband 75Ω 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
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.
C h ar g e - P um p O u tp u t . C o n n e c t t h i s o u t p u t t o t he P L L l o o p fi l t e r i n p u t w i t h th e s h or t e s t c o n n e ct i o n
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
1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias with other
ground connections.
Crystal-Oscillator Interface. Use with an external parallel-resonance-mode crystal through a series 1nF
capacitor. See the Typical Application Circuit.
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
1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias with other
ground connections.
Quadrature Baseband Differential Output. AC-couple with 47nF capacitors to the demodulator input.
In-Phase Baseband Differential Output. AC-couple with 47nF capacitors to the demodulator input.
I-Channel Baseband DC Offset Correction. Connect a 47nF ceramic chip capacitor from IDC- to IDC+.
Q- C hannel Baseb and D C O ffset C or r ecti on. C onnect a 47nF cer am i c chi p cap aci tor fr om QD C - to QD C + .
DC Power Supply for Baseband 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.
GC1
= 0.5V corresponds to the maximum gain setting.
DESCRIPTION
Pin Description