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,
low power dissipation, and small form factor. The device is compliant with
DVB (ETS 300-421) and DSS specifications for satellite transmission, and
provides digital derotation, digital filtering, 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
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
• DiSEqC™ Level 1.1 LNB control
CONEXANT [ CONEXANT SYSTEMS, INC ]
