Dual DVB-S2 Demodulator and
FEC Decoder
The CX24117 is a dual-integrated demodulator based on an open DVB-S2
The CX24117 can simultaneously demodulate and decode two separate
The CX24117 has an on-chip microcontroller for fast signal acquisition,
The CX24117 is a DiSEqC 2.x-compliant demodulator that enables two-way
The CX24117 has integrated signal-to-noise ratio (SNR) and bit error rate
CX24117
Conexant’s portfolio includes a comprehensive suite of semiconductor
solutions for broadband communications and the digital home.
use advanced modulation and coding (AMC) with 8PSK/ quadrature phase-
(FEC). This allows an increased satellite throughput of up to 30 percent that
can be used to offer additional programming and services. The CX24117
communication between the set-top box (STB) and peripheral satellite
equipment, such as low-noise block (LNB) converters and switches.
(BER) monitors for channel-performance measurements that simplify
consumer video services, such as transmitting additional local channels and
set-top box solutions
Satellite
standard. The demodulator offers an alternate path for service providers to
shift keying (QPSK) demodulation and LDPC/BCH forward error correction
also supports DVB-S and DIRECTV® Legacy modes.
signals transmitted with accordance to the DVB-S2 signals and DVB-S
and DIRECTV specifications. It has 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.
Es/No estimation and system monitoring. The on-chip microcontroller saves
software integration time by minimizing the external driver code.
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
HDTV channels.
description
part number CX24117
Distinguishing Features
8PSK/QPSK Demodulation
• DVB-S/DIRECTV Legacy modes
• DVB-S2 modes
• Automatic Acquisition
• ±10 MHz Acquisition range
• Internal microcontroller reduces software
• Integrated SNR and BER monitor
• DiSEqCTM 2.x compliant
• Power-down mode for each demodulator path
• 1.0 V core voltage
• 3.3 V I/O voltage
• 144-pin eTQFP
Symbol Rates
- 1-45 Msps
Code Rates
- 1/2, 2/3, 3/4, 4/5, 5/6, 6/7, 7/8
Symbol Rates
- QPSK/LDPC/BCH: 20-30 Msps
- 8PSK/LDPC/BCH: 10-30 Msps
Code Rates
- QPSK: 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9, 9/10
- 8PSK: 3/5, 2/3, 3/4, 5/6, 8/9, 9/10
driver development time
Dual DVB-S2 Demodulator
and FEC Decoder