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CATV front-end chip offers dual tuners, demodulators

Posted: 09 Nov 2010 ?? ?Print Version ?Bookmark and Share

Keywords:tuner? demodulator? RF?

The MxL251, MaxLinear Inc.'s cable TV front-end chip with dual tuners and dual QAM demodulators is now available with the promise of drastically reducing the number of tuners needed for multi-channel DOCSIS and cable video gateways.

The single-die digital front-end chip with two narrow-band RF tuners (6 or 8MHz), two QAM demodulators and an integrated splitter to support dual- or triple tuner designs was developed using standard digital 65nm digital CMOS process. All global cable standards, including ITU-T J.83 Annex A/B/C, are supported and the tuner can receive one RF coaxial cable input while offering two MPEG transport stream outputs or two channels on an intermediate frequency (IF) output.

The MxL251 integrates discrete tuners, demodulators, external RF splitter and loop through elements in a smaller PCB board size, thereby reducing external component costs and simplifying design.

The MxL251, available in a compact 7x7mm 48-pin QFN package, is a replacement for the MxL241SFthe industry's first single-die, integrated tuner and QAM demodulator "CMOS MPEG Tuner" IC. It consumes 700mW of power for the combined two channel reception mode, while a battery operation mode of 350mW for back-up is available using just two battery cells.

As the MxL251 has no special heat dissipation requirements, fans, heat shields, and heat sinks are no longer needed.

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