CONEXANT CX24114

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.
Distinguishing Features
• DVB/DSS/DCII compliant
• 8PSK/QPSK/BPSK demodulation
• Symbol rates
A unique feature of the CX24114 is an automatic acquisition algorithm
that searches and acquires the carrier within ±10 MHz range during initial
- DVB: 15-30 MSps
acquisition and performs a smart search to reacquire during fade condition.
- Turbo QPSK: 15-30 MSps
The CX24114 has an on-chip microcontroller for acquisition, Es/No frequency
- 8PSK: 15-30 MSps
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
• 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
equipment such as low-noise block (LNB) converters and switches. The
• Automatic acquisition
CX24114 has integrated signal-to-noise ratio (SNR) and bit error rate (BER)
• DiSEqC 2.x compliant
monitors for channel-performance measurements to simplify production testing.
Conexant’s advanced modulation front-end solution enables satellite STB
TM
• Power down mode
• Integrated SNR and BER monitor
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
Set-top Box Solutions
Satellite
CX24114 Features
• Dual Integrated 8-bit ADCs
• Serial/parallel output data I/F
• Carrier tracking: ± sample frequency/8
• Supply voltage: 1.2 V
• Internal carrier and bit timing recovery
• Ambient temperature: 0–85º C
• ±10 MHz acquisition range
• 100-pin TQFP
������������
����������
�����������
������������
����
�
���
����
����
�����������
�
����
����
���������
����
������
����������
�
������
������������
�����
���������
���������
�������
���
������������
���������
�����
���������
��������������
���������
����
�����������
CX24114 Advanced Modulation Demodulator and Turbo FEC Decoder
© 2004, 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.
04-1073
www.conexant.com
General Information:
U.S. and Canada: (800) 854-8099
International: (949) 483-6996
Headquarters – Newport Beach
4000 MacArthur Blvd, P.O. Box C
Newport Beach, CA 92660-3095
Order# 102361A