CONEXANT CX24130

Digital Set-top Box Solutions
Satellite
Dual Stream QPSK/BPSK Demodulator lC
CX24130
High-Performance, Low-Power Broadband
Satellite Dual Independent Front-End Solution
Conexant’s CX24130 is the industry’s first 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 significantly 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,
CX24130 Distinguishing Features
DVB (ETS 300-421) and DSS specifications for satellite transmission, and
• Dual Stream QPSK/BPSK
demodulation paths
provides digital derotation, digital filtering, equalization and Viterbi/Reed-
• DVB/DSS compliant
Solomon forward error correction (FEC). A variety of advanced features
• Symbol rates: 10 to 30 Msps
low power dissipation, and small form factor. The device is compliant with
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.
• Automatic acquisition
• Adaptive (FIR) equalizer
• Internal Viterbi and Reed-Solomon FEC
A robust carrier-tracking loop corrects for frequency offsets due to
• Internal SNR and BER monitors
inexpensive low noise block down-converters (LNBs), and a unique
• DiSEqC™ Level 1.1 LNB control
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
Digital Set-top Box Solutions
Satellite
CX24130 Features
• QPSK/BPSK demodulation
• 144-pin LQFP package
• DVB/DSS compliant
• External crystal frequency: 10 MHz
• Symbol rates: 10 to 30 Msps
• Sampling frequency: 45, 60, 90 MHz
• Automatic acquisition
• Carrier tracking: ± sample frequency/8
• Adaptive (FIR) equalizer
• Quadrature equalization compensation:
±3 dB gain, ±13° phase
• Internal carrier and bit timing recovery
• Viterbi decoding rates:
1/2, 2/3, 3/4, 4/5, 5/6, 6/7, and 7/8
• Internal Viterbi and Reed-Solomon FEC
• Internal SNR and BER monitors
• Output data interface: serial or parallel
• DiSEqC™ Level 1.1 LNB control
• Supply voltage: +3.3V, +1.8V
• 3.3 V signaling, 5 V tolerant interface
• Support for three status LEDs
CX24130 block diagram
© 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.
02-0744
www.conexant.com
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Order# 101615B