CONEXANT CX24109

Set-top Box Solutions
Satellite
Digital Satellite Tuner
CX24109
Highly Integrated, Direct Down-Conversion Satellite Tuner
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 mixedsignal integrated circuit design, Conexant introduces the CX24109 Digital
Satellite Tuner – a highly integrated, direct down-conversion satellite tuner
intended for high-volume digital video, audio, and data receivers. The
CX24109 consists of an LNA, variable RF attenuator, quadrature
downconverter, variable IF gain amplifiers, variable low-pass filters, VCO,
and synthesizer. This highly integrated satellite tuner RF IC does not require
a balun, therefore simplifying RF layout and reducing the overall BOM cost.
When combined with Conexant’s CX24123 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.
The CX24109 and CX24123 provides a streamlined, cost optimized front-end
solution offered in a compact design that saves valuable board space and is
easy to implement.
Distinguishing Features
• DVB/DSS/DCII – compliant
• Single-chip RF-to-baseband
satellite receiver
• Zero-IF architecture eliminates
the need for image-reject filtering
• Variable baseband filters for optimal
interference rejection
• Integrated LNA and LO with onboard
VCO and synthesizer
• Single +5V supply
• 48-pin ETQFP
Part Number CX24109
CX24109 Block Diagram
Description
Digital Satellite Tuner
Set-top Box Solutions
Satellite
RF
Connector
CX24109
A/V Connectors
RJ-11
Xtal
Zero I/F Tuner
CX20493
SmartDAA
Line Side Device
Stereo
DAC
FLASH
DBS Core System Receiver and Decoder
2
E PROM
SDRAM
TDA8004
CA Card
Reader
Front Panel
buttons, indicators, IRin
Complete IC System Solution for Worldwide DBS Platforms
CX24109 Product Features
•
•
•
•
•
•
•
• Single-chip RF-to-baseband satellite receiver
• Zero-IF architecture eliminates the need for
image-reject filtering
• Integrated LNA
• Integrated LO with onboard VCO and synthesizer
• Variable baseband filters for optimal
interference rejection
• Single +5V supply
Applications
Product Specifications
•
•
•
•
• DBS set-top boxes
• Commercial digital video, audio and data receivers
• Digital VCRs
RF input: 950 to 2150 MHz
Input power range: -20 to -81 dBm
Noise figure: 10 dB, typical
Input IP3 at minimum gain: 10 dBm, typical
© 2003, Conexant Systems, Inc. All Rights Reserved. Conexant and the
Conexant logo are 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.
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
Conexant shall not be liable for any
special, indirect, incidental or consequential damages as a result of its use.
03-0856
I/Q phase difference: ±3 degrees, typical
I/Q amplitude difference: ±1.5 dB, typical
Filter tune range: 0.5 to 30 MHz
Output voltage, RL≥1kΩ: 0.5 Vp-p
Typical junction temperature: 90° C at room temperature
Operating temperature range: 0° to 70° C
Package type: 48-pin ETQFP
Order# 102204A