CX24123 CONEXANT [Conexant Systems, Inc], CX24123 Datasheet
CX24123
Manufacturer Part Number
CX24123
Description
Demodulator and FEC Decoder Low-power QPSK demodulator for worldwide satellite set-top box applications
Manufacturer
CONEXANT [Conexant Systems, Inc]
Datasheet
1.CX24123.pdf
(2 pages)
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Digital Set-top Box Solutions
Satellite
CX24123 Demodulator and FEC Decoder
The CX24123 is the ideal solution for a wide variety of applications in digital
This DiSEqC
overall system performance. The CX24123 automatically corrects for external
variations (e.g., due to rain fade) are compensated by automatic gain control
(AGC). Frequency offsets due to inexpensive consumer LNBs are corrected
A unique feature of the CX24123 is an automatic acquisition algorithm that
Low-power QPSK demodulator for worldwide satellite
set-top box applications
Conexant’s broadband communications portfolio includes a comprehensive
suite of semiconductor solutions that enable the digital home and information
network. The CX24123 is a DVB, DSS, and DCII compliant demodulator and
Forward Error Correction (FEC) decoder. When combined with a satellite tuner,
such as the CX24109 tuner, the CX24123 provides a complete broadband
satellite front-end solution capable of operating from 1 to 45 Msps.
satellite set-top box, personal computer receivers and residential gateways.
between the set-top box and peripheral satellite equipment such as Low-
Noise Block Converters (LNB) and switches.
Providing digital derotation, digital filtering, equalization, and Viterbi/Reed-
Solomon FEC, the CX24123 provides many advanced features that enhance
quadrature gain/phase imbalances and for DC offsets. Input signal level
by a robust Carrier-Tracking Loop.
searches and acquires the carrier within a ± 10 MHz range during initial
acquisition and performs a smart search to reacquire the carrier during fade
conditions. The CX24123 has integrated signal-to-noise Ratio (SNR) and Bit
Error Rate (BER) monitors for basic channel performance measurements,
which saves time and test equipment during production.
™
2.x compliant demodulator enables two-way communication
CX24123 Distinguishing Features
• DVB/DSS/DCII - compliant
• Symbol rates: 1 to 45 Msps
• Automatic acquisition
• Low-power design
• Internal SNR and BER monitors
• DiSEqC
• Low-Noise Block Converter
• Available in both 80 and 64 pin TQFP
Part Number CX24123
Description
(LNB) control
™
Level 2.x compatible
Demodulator and FEC Decoder
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CX24123 Summary of contents
Page 1
... Forward Error Correction (FEC) decoder. When combined with a satellite tuner, such as the CX24109 tuner, the CX24123 provides a complete broadband satellite front-end solution capable of operating from Msps. The CX24123 is the ideal solution for a wide variety of applications in digital satellite set-top box, personal computer receivers and residential gateways. This DiSEqC 2.x compliant demodulator enables two-way communication ™ ...
Page 2
... Residential gateways I soft VDATA Viterbi Reed- Q soft Decoder Solomon VDATA_CLK Auto Microprocessor Acquisition Interface CX24123 Block Diagram www.conexant.com General Information: U.S. and Canada: (800) 854-8099 International: (949) 483-6996 Headquarters – Newport Beach 4311 Jamboree Rd, P .O. Box C Newport Beach, CA 92660-3095 Order# 102134A RS_DATA[7:0] RS_CLOCK ...