Digital Set-top Box Solutions
Satellite
CX24130 Distinguishing Features
Dual Stream QPSK/BPSK
demodulation paths
DVB/DSS compliant
Symbol rates: 10 to 30 Msps
Automatic acquisition
Adaptive (FIR) equalizer
Internal Viterbi and Reed-Solomon FEC
Internal SNR and BER monitors
DiSEqCTM Level 1.1 LNB control
High-Performance, Low-Power Broadband
Satellite Dual Independent Front-End Solution
Conexant's CX24130 is the industry's fi rst single-chip dual-stream QPSK/
BPSK demodulator designed for satellite receiver systems. The device
is ideal for applications such as personal video recorders (PVRs) that
process dual incoming video streams to simultaneously play and record
two different television programs. Other applications include digital video
broadcasting/digital satellite system (DVB/DSS) set-top and PC receivers,
and residential gateways. In addition, when combined with the CX24108
Satellite Tuner RF ICs, the CX24130 provides a complete dual broadband
satellite front-end solution capable of operating from 10 to 30 Msps.
With the CX24130, Conexant has signifi cantly reduced product size and
component requirements by replacing two 100-pin demodulators with one
80-pin IC. Key features include superior bit error rate (BER) performance,
low power dissipation, and small form factor. The device is compliant with
DVB (ETS 300-421) and DSS specifi cations for satellite transmission, and
provides digital derotation, digital fi ltering, equalization and Viterbi/Reed-
Solomon forward error correction (FEC). A variety of advanced features
enhance overall system performance, including automatic correction for
external quadrature gain/phase imbalances and DC offsets, and automatic
gain control (AGC) to compensate for input signal level variations.
A robust carrier-tracking loop corrects for frequency offsets due to
inexpensive low noise block down-converters (LNBs), and a unique
automatic acquisition algorithm searches and acquires the carrier during
initial acquisition, and performs a smart search to reacquire the carrier
during fade conditions. In addition, the CX24130 features integrated
signal-to-noise-ratio (SNR) and bit-error-rate (BER) monitors that facilitate
channel-performance measurements.The CX24130 demodulator is
manufactured using proven 0.18-micron CMOS process technology.
Conexant provides a complete reference design package that allows
designers to rapidly bring innovative new products to market.
Part Number CX24130
Description Dual Stream Demodulator IC
Dual Stream QPSK/BPSK Demodulator lC
CX24130
2002, Conexant Systems, Inc. All Rights Reserved. Conexant and the Conexant
logo are registered 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.
Digital Set-top Box Solutions
Satellite
CX24130 Features
QPSK/BPSK demodulation
DVB/DSS compliant
Symbol rates: 10 to 30 Msps
Automatic acquisition
Adaptive (FIR) equalizer
Internal carrier and bit timing recovery
Internal Viterbi and Reed-Solomon FEC
Internal SNR and BER monitors
DiSEqCTM Level 1.1 LNB control
3.3 V signaling, 5 V tolerant interface
Support for three status LEDs
144-pin LQFP package
External crystal frequency: 10 MHz
Sampling frequency: 45, 60, 90 MHz
Carrier tracking: sample frequency/8
Quadrature equalization compensation:
3 dB gain, 13 phase
Viterbi decoding rates:
1/2, 2/3, 3/4, 4/5, 5/6, 6/7, and 7/8
Output data interface: serial or parallel
Supply voltage: +3.3V, +1.8V
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# 101615B
CX24130 block diagram
02-0744
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