CX24121 Conexant Systems, Inc., CX24121 Datasheet

CX24121

Manufacturer Part Number

CX24121

Description

Highly Integrated, Complete Broadband Satellite Front-End Solution

Manufacturer

Conexant Systems, Inc.

Datasheet

1.CX24121.pdf (2 pages)

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Digital Set-top Box Solutions

Satellite

CX24109 Digital Satellite Tuner and

CX24121 QPSK/FEC Demodulator

The CX24109 is a highly integrated, direct down-conversion satellite tuner

10 to 32 Msps specifically targeting the PayTV segment of the market with

The CX24121 is the ideal solution for a wide variety of applications in

of operating from 10 to 32 Msps. The demodulator provides digital derotation,

Automatic Gain Control (AGC). Frequency offsets due to inexpensive

Highly Integrated, Complete Broadband Satellite

Front-End Solution

Conexant’s broadband communications portfolio includes a comprehensive

suite of semiconductor solutions that enable the digital home and information

network. Combining extensive experience in broadband systems and mixed-

signal integrated circuit design, Conexant introduces the CX24109 Digital

Satellite Tuner and CX24121 DBS Demodulator/FEC Decoder creating the ideal

satellite front-end solution for the world wide pay TV services. Several million

Satellite Set-Top Boxes (STBs) are deployed in many different entertainment

networks around the world today. This highly integrated combination of

demodulator and satellite tuner reduces the BOM costs and simplifies RF

layout.

CX24109

intended for high-volume digital video, audio, and data receivers. When

combined with Conexant’s existing CX24110 QPSK demodulator/FEC

decoder, the chipset provides a complete broadband satellite front-end

solution capable of operating from 1 to 45 Msps in the most demanding

satellite environments. It is compatible with international standards such

as DVB and DSS and supports a BPSK mode as well as DCII. Combined

with the CX24121 QPSK demodulator/FEC decoder, the chipset provides a

complete broadband satellite front-end solutions capable of operating from

a very optimized BOM and cost effective solution.

CX24121

DVB/DSS/DCII STB and Personal Computer (PC) receivers and residential

gateways. When combined with the CX24109 silicon satellite tuner, the

CX24121 provides a complete broadband satellite front-end solution capable

digital filtering, equalization, and Viterbi/Reed-Solomon Forward-Error

Correction (FEC). The CX24121 is compliant with the DVB (ETS 300-421)

specification for satellite transmission and provides many advanced features

that enhance overall system performance. The demodulator automatically

corrects for external quadrature gain/phase imbalances and for DC offsets.

Input signal level variations (e.g., due to rain fade) are compensated by

consumer Low-Noise Block Converters (LNBs) are corrected by a robust

Carrier-Tracking Loop (CTL). A unique feature of the CX24121 is an automatic

acquisition algorithm that searches and acquires the carrier during initial

acquisition and performs a smart search to reacquire the carrier during fade

conditions. The CX24121 has integrated Signal-to-Noise Ratio (SNR) and

Bit Error Rate (BER) monitors for channel-performance measurements. The

CX24121 also integrate a DiSEqC

satellite LNB.

™

Level 1.2 for controlling the external

Distinguishing Features

CX24109

• DVB/DSS – compliant

• Single-chip RF-to-baseband

• Zero-IF architecture eliminates the

• Variable baseband filters for optimal

• Integrated LNA and LO with onboard

• Single +5V supply

• 48-pin eTQFP

CX24121

• DVB/DSS/DCII - compliant

• Symbol rates: 10 to 32 Msps

• Automatic acquisition

• Internal SNR and BER monitors

• DiSEqC™ Level 1.1 LNB control

• 80-pin PQFP

Part Number CX24109 and CX24121

Description

satellite receiver

need for image-reject filtering

interference rejection

VCO and synthesizer

Digital Satellite Tuner and Demodulator

Related parts for CX24121

CX24121 Summary of contents

Page 1

... Msps specifically targeting the PayTV segment of the market with a very optimized BOM and cost effective solution. CX24121 The CX24121 is the ideal solution for a wide variety of applications in DVB/DSS/DCII STB and Personal Computer (PC) receivers and residential gateways. When combined with the CX24109 silicon satellite tuner, the CX24121 provides a complete broadband satellite front-end solution capable of operating from Msps ...

Page 2

... Carrier tracking: ±5 MHz • Quadrature equalization compensation: - 3.0 dB gain imbalance with 13-degree phase offset • Low-power design • Serial or parallel output data interface CX24121 Applications • DVB/DSS/DCII set-top and PC receivers • Residential gateways www.conexant.com General Information: U.S. and Canada: (800) 854-8099 International: (949) 483-6996 Headquarters – ...

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