CX24109-11Z,557 NXP Semiconductors, CX24109-11Z,557 Datasheet - Page 13

• Manufacturer Part Number: CX24109-11Z,557
• Description: IC SATELLITE TUNER DGTL 48-ETQFP
• Manufacturer: NXP Semiconductors
• Type: Tunerr

Specifications of CX24109-11Z,557

• Applications: Set-Top Boxes, Video Players
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP Exposed Pad, 48-eTQFP, 48-HTQFP, 48-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935287219557

NXP Semiconductors
Figure 2.
1.4
CX24109_N_1
Product data sheet
LNB
Cable
Drop
Signal Path
QPSK Demodulation Typical Application Block Diagram
Dish
Antenna
network requires an antenna, a Low Noise Block (LNB) downconverter, a drop cable, and an
STB. The LNB converts the satellite downlink frequency to an intermediate L-band frequency
where it is passed to the STB via the drop cable. The STB front end consists of a tuner and a
demodulator/FEC IC. The satellite tuner must tune to the L-band frequency, downconvert the
carrier, and separate it to baseband I and Q signals. The demodulator/FEC IC includes
QPSK Demodulation, carrier tracking, AGC control, bit timing, and the required FEC for a
given network service.
CX24109/CX24121 chip set in an STB front end.
The CX24109 is a highly integrated, direct-down conversion satellite tuner. It consists of an
LNA, variable RF attenuator, quadrature downconverter, variable IF gain amplifiers, variable
low-pass filters, VCO, and synthesizer. A detailed block diagram of the IC is illustrated in
Figure
3.
RFIN
XTAL1
XTAL2
CLKREFOUT
RF Tuner IC
CX24109
Rev. 01 — 13 November 2008
Figure 2
TUNERES
FILTUNE
QOUTN
QOUTP
IOUTN
IOUTP
AGC
LD
illustrates a typical application block diagram for the
3
Tuner Control
I_N
Q_N
AGCV
FILTERV
LD
Demod/FEC IC
CX24121
Chapter 1: Functional Description
RS_DATA[7:0]
RS_CLK
RSCntl1
RSCntl2
8
CX24109
© NXP B.V. 2008. All rights reserved.
To
MPEG
Processor
102031_003
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