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CX24128

Conexant Systems
Part Number CX24128
Manufacturer Conexant Systems
Description Digital Satellite Dual Tuner RF IC
Published Dec 14, 2005
Detailed Description Set-top Box Solutions Satellite Digital Satellite Dual Tuner RF IC CX24128 Industry’s First Dual Tuner for DVR Applicat...
Datasheet PDF File CX24128 PDF File

CX24128
CX24128

Overview
Set-top Box Solutions Satellite Digital Satellite Dual Tuner RF IC CX24128 Industry’s First Dual Tuner for DVR Applications Conexant’s portfolio includes a comprehensive suite of semiconductor solutions for broadband communications, enterprise networks and the digital home.
The CX24128 is Conexant’s innovative dual stream direct down-conversion satellite tuner RF IC intended for high-volume digital video, audio, and data receivers.
The CX24128 offers excellent phase noise performance and very low implementation loss, required for advanced modulation systems such as 8PSK and DVB-S2.
The CX24128 provides bill of materials (BOM) savings over two single tuners and simplifies layout for DVR set-top boxes (STBs).
The CX24128 has a built-in auto-tuning machine that eliminates the need for software calibration routine and accelerates the calibration time.
The on-chip fractional synthesizers enable fine frequency step size without adversely affecting lock time.
The CX24128 requires a single 3.
3 V power supply and has an improved power supply rejection ratio (PSRR) that reduces the need for power supply conditioning components required for proper operation.
The CX24128 does not require a Balun, thus reducing external BOM cost.
Its highly integrated design saves valuable board space and simplifies RF layout.
Distinguishing Features w PLL Dividers, Phase Detector and Charge Pump Variable Low AGC Pass Filter Amplifier • State of the art isolation between two channels I Channel Output A w VCO VCA RF INPUT A w 90 0 • Zero-IF architecture eliminates the need for image reject filtering • Very low phase noise for 8PSK and DVB-S2 applications • Variable baseband filters for optimal interference rejection • Auto-tuning machine eliminates need for software calibration • Very low power consumption • Small (7 mm x 7 mm) footprint • Lead-free package Part Number CX24128 Description Digital Satellite Dual Tuner RF IC .
D Q Channel Output A RF INPUT B at aS VCO Reference to De...


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