Set-top Box Solutions

Satellite

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

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 mixed-

signal 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.

Part Number CX24109

Description

Digital Satellite Tuner

CX24109

Digital Satellite Tuner

CX24109 Block Diagram