Set-top Box Solutions
Satellite
Advanced Modulation Demodulator
and Turbo FEC Decoder
CX24114
Low-power advanced modulation demodulator for
worldwide satellite set-top box applications
Conexant’s broadband communications portfolio includes a comprehensive
suite of semiconductor solutions that enables the digital home and
information network. The CX24114 advanced modulation turbo FEC decoder
provides increased satellite system throughput by up to 35 percent utilizing
existing bandwidth.
The CX24114 demodulator converts incoming analog signals from a tuner into
a digital format, assesses the signal for errors, and then outputs a digital data
transport stream to an audio/video decoder chip.
The CX24114 can decode DVB, DSS QPSK/BPSK signals at 15-30 MSps.
It is fully compliant with DVB and DSS specifications and is designed to
work with existing and next-generation transponders. It has two 8-bit A/D
converters that are required for high-performance operation. The low power
consumption and dissipation, combined with a small footprint, increases
reliability and lowers overall cost.
A unique feature of the CX24114 is an automatic acquisition algorithm
that searches and acquires the carrier within ±10 MHz range during initial
acquisition and performs a smart search to reacquire during fade condition.
The CX24114 has an on-chip microcontroller for acquisition, Es/No frequency
estimation, and system monitoring.
The CX24114 is a DiSEqC 2.x compliant demodulator that enables two-way
communication between the Set-top Box (STB) and peripheral satellite
equipment such as low-noise block (LNB) converters and switches. The
CX24114 has integrated signal-to-noise ratio (SNR) and bit error rate (BER)
monitors for channel-performance measurements to simplify production testing.
Conexant’s advanced modulation front-end solution enables satellite STB
providers to deliver cost-effective, digital STBs that support a wide range
of consumer video services, such as transmitting additional channels and
providing HDTV viewing preferences.
Part Number
CX24114
Description
Advanced Modulation Demodulator
and Turbo FEC Decoder
Distinguishing Features
• DVB/DSS/DCII compliant
• 8PSK/QPSK/BPSK demodulation
• Symbol rates
- DVB: 15-30 MSps
- Turbo QPSK: 15-30 MSps
- 8PSK: 15-30 MSps
• Advanced modulation rates
- Turbo QPSK: 1/2, 2/3, 3/4, 5/6, 7/8
- 8PSK: 2/3, 3/4, 4/5, 5/6, 8/9
• Automatic acquisition
• DiSEqC 2.x compliant
TM
• Power down mode
• Integrated SNR and BER monitor
CONEXANT [ CONEXANT SYSTEMS, INC ]
