Digital Set-top Box Solutions
Satellite
Distinguishing Features
CX24109
· DVB/DSS compliant
· Single-chip RF-to-baseband
satellite receiver
· Zero-IF architecture eliminates the
need for image-reject filtering
· Variable baseband filters for optimal
interference rejection
· Integrated LNA and LO with onboard
VCO and synthesizer
· Single +5V supply
· 48-pin eTQFP
CX24121
· DVB/DSS/DCII - compliant
· Symbol rates: 10 to 32 Msps
· Automatic acquisition
· Internal SNR and BER monitors
· DiSEqCTM Level 1.1 LNB control
· 80-pin PQFP
Highly Integrated, Complete Broadband Satellite
Front-End Solution
Conexant's broadband communications portfolio includes a comprehensive
suite of semiconductor solutions that enable the digital home and information
network.
Combining extensive experience in broadband systems and mixed-
signal integrated circuit design, Conexant introduces the CX24109 Digital
Satellite Tuner and CX24121 DBS Demodulator/FEC Decoder creating the ideal
satellite front-end solution for the world wide pay TV services. Several million
Satellite Set-Top Boxes (STBs) are deployed in many different entertainment
networks around the world today. This highly integrated combination of
demodulator and satellite tuner reduces the BOM costs and simplifies RF
layout.
CX24109
The CX24109 is a highly integrated, direct down-conversion satellite tuner
intended for high-volume digital video, audio, and data receivers. When
combined with Conexant's existing CX24110 QPSK demodulator/FEC
decoder, the chipset provides a complete broadband satellite front-end
solution capable of operating from 1 to 45 Msps in the most demanding
satellite environments. It is compatible with international standards such
as DVB and DSS and supports a BPSK mode as well as DCII. Combined
with the CX24121 QPSK demodulator/FEC decoder, the chipset provides a
complete broadband satellite front-end solutions capable of operating from
10 to 32 Msps specifically targeting the PayTV segment of the market with
a very optimized BOM and cost effective solution.
CX24121
The CX24121 is the ideal solution for a wide variety of applications in
DVB/DSS/DCII STB and Personal Computer (PC) receivers and residential
gateways. When combined with the CX24109 silicon satellite tuner, the
CX24121 provides a complete broadband satellite front-end solution capable
of operating from 10 to 32 Msps. The demodulator provides digital derotation,
digital filtering, equalization, and Viterbi/Reed-Solomon Forward-Error
Correction (FEC). The CX24121 is compliant with the DVB (ETS 300-421)
specification for satellite transmission and provides many advanced features
that enhance overall system performance. The demodulator automatically
corrects for external quadrature gain/phase imbalances and for DC offsets.
Input signal level variations (e.g., due to rain fade) are compensated by
Automatic Gain Control (AGC). Frequency offsets due to inexpensive
consumer Low-Noise Block Converters (LNBs) are corrected by a robust
Carrier-Tracking Loop (CTL). A unique feature of the CX24121 is an automatic
acquisition algorithm that searches and acquires the carrier during initial
acquisition and performs a smart search to reacquire the carrier during fade
conditions. The CX24121 has integrated Signal-to-Noise Ratio (SNR) and
Bit Error Rate (BER) monitors for channel-performance measurements. The
CX24121 also integrate a DiSEqCTM Level 1.2 for controlling the external
satellite LNB.
Part Number CX24109 and CX24121
Description Digital Satellite Tuner and Demodulator
CX24109 Digital Satellite Tuner and
CX24121 QPSK/FEC Demodulator
© 2002, Conexant Systems, Inc. All Rights Reserved. Conexant and the
Conexant logo are trademarks of Conexant Systems, Inc. All other trademarks
are owned by their respective owners. Although Conexant strives for accuracy
in all its publications, this material may contain errors or omissions and is
subject to change without notice.
THIS MATERIAL IS PROVIDED AS IS AND WITHOUT
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NON-INFRINGEMENT.
Conexant shall not be liable for any
special, indirect, incidental or consequential damages as a result of its use.
02-0540
Digital Set-top Box Solutions
Satellite
CX24109 Features
· Zero-IF architecture eliminates the need for image
reject filtering
· Integrated LNA
· Integrated LO with onboard VCO and synthesizer
· Single +5 V supply
· Oscillator output for demodulator
CX24109 Applications
· DBS set-top boxes
· Commercial digital video, audio and data receivers
· Digital VCRs
CX24121 Features
· DVB/DSS/DCII-compliant
· Symbol rates 10 to 32 Msps
· 6-bit Analog-to-Digital Converters (ADCs)
· Internal PLL so that only a single low-frequency
crystal or clock is required
· 4-bit soft decision
· Digital matched filtering
· Multirate decimation filter
· Automatic acquisition
· Internal carrier and bit-timing recovery
· Internal SNR and BER monitors
· DiSEqCTM Level 1.2 LNB control
· Power-down mode
· Boundary scan test function
· Carrier tracking: ±5 MHz
· Quadrature equalization compensation:
- 3.0 dB gain imbalance with 13-degree phase offset
· Low-power design
· Serial or parallel output data interface
CX24121 Applications
· DVB/DSS/DCII set-top and PC receivers
· Residential gateways
www.conexant.com
General Information:
U.S. and Canada: (800) 854-8099
International: (949) 483-6996
Headquarters Newport Beach
4311 Jamboree Rd, P.O. Box C
Newport Beach, CA 92660-3095
Order# 102075A
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