Set-top Box Solutions
Satellite
Digital Satellite Tuner RF IC
CX24113A
Highly Integrated, Worldwide Broadband Satellite
Front-End Solution
Conexant鈥檚 portfolio includes a comprehensive suite of semiconductor solutions for
broadband communications, enterprise networks and the digital home. The CX24113A
is Conexant鈥檚 third generation direct down-conversion satellite tuner RF IC intended
for operator-based digital satellite networks and free-to-air systems. The CX24113A is
a highly integrated satellite tuner solution that incorporates an advanced Fractional-N
synthesizer, I2C serial interface, a fully integrated local oscillator, and variable baseband
filters. The device has an improved power supply rejection ratio (PSRR), requires a
single +3.3V supply, and features very low power consumption.
The CX24113A has a built-in auto-tuning machine that eliminates the need for software
calibration and accelerates the calibration time. The on-chip fractional synthesizer
enables fine frequency step size without adversely affecting lock time. The CX24113
does not require a balun, thus reducing external bill of materials (BOM) cost. Its highly
integrated design saves valuable board space and simplifies RF layout.
The company鈥檚 broad portfolio of semiconductor products also includes client-side xDSL
and cable modem solutions, home network processors, broadcast video encoders and
decoders, digital set-top box components and systems solutions, and dial-up modems.
In addition to its IEEE 802.11a/b/g-compliant WLAN chipsets, software and reference
designs, Conexant offers a suite of networking components that includes solutions
for applications based on HomePlug
廬
and HomePNA
鈩?/div>
. Additional products include a
complete line of asymmetric and symmetric DSL central office solutions, which are
used by service providers worldwide to deliver broadband data, voice, and video over
copper telephone lines.
Distinguishing Features
鈥?Single-chip RF-to-baseband
satellite receiver
鈥?Zero-IF architecture eliminates the
need for image reject filtering
鈥?Variable baseband filters for optimal
interference rejection
鈥?Auto-tuning machine eliminates the
need for software calibration
Variable Low
AGC
Amplifier Pass Filter
RF INPUT
VCA
90
0
鈥?Very low power consumption
I Channel
Output
鈥?Small (6 mm x 6 mm) footprint
鈥?Lead-free package
VCO
Reference
Oscillator
PLL Dividers, Phase
Detector and Charge Pump
Reference
to Demod
Programming
and Control
Q Channel
Output
Part Number
CX24113A
Description
Digital Satellite Tuner RF IC
CX24113 Block Diagram
CONEXANT
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