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Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
Pin Description (continued)
PIN
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
—
NAME
VCC_SYN
XTAL
REFOUT
VCC_DIG
QOUT+
QOUT-
IOUT+
IOUT-
IDC+
IDC-
QDC+
QDC-
VCC_BB
SDA
SCL
ADDR
EP
FUNCTION
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 by a series 1nF
capacitor. See the Typical Operating 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 to the pin as possible. Do not share capacitor ground vias
with other ground connections.
Quadrature Baseband Differential Output. AC-couple with a 47nF capacitor to the demodulator input.
In-Phase Baseband Differential Output. AC-couple with a 47nF capacitor to the demodulator input.
I-Channel baseband DC Offset Correction. Connect a 47nF ceramic chip capacitor from IDC- to
IDC+.
Q-Channel Baseband DC Offset Correction. Connect a 47nF ceramic chip capacitor from QDC- to
QDC+.
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.
2-Wire Serial Data Interface. Requires a > 1k ? pullup resistor to V CC .
2-Wire Serial Clock Interface. Requires a > 1k ? pullup resistor to V CC .
Address. ADDR is at logic-high if unconnected.
Exposed Paddle. Solder evenly to the board’s ground plane for proper operation.
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9
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