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Dual-tuner, quad demodulator digital cable front-end chip for 8ch

Posted: 22 Oct 2010 ?? ?Print Version ?Bookmark and Share

Keywords:demodulator? digital cable? front-end chip?

MaxLinear Inc. has come up with the MxL261the industry's first dual-tuner, quad demodulator digital cable front end chip that can capture eight channels in a 200MHz input frequency bandwidth located in the cable spectrum.

The company's proprietary digital CMOS process-based RF and mixed-signal technology was used to create the single-die, global standards, digital cable front end featuring an integrated splitter, two 100MHz wideband tuners, four QAM demodulators, and a four-channel wide IF output.

The two wideband tuners can be tuned independently of each other to capture two 100MHz input frequency bands anywhere in the cable spectrum. Any four of the captured eight channels can be converted to four MPEG transport stream outputs using the four QAM demodulators while the other four channels are bonded into a contiguous band and transmitted as an IF output.

A splitter output supports more than eight channels when combined in a cascade with another MaxLinear IC. The MxL261, available in a 7x7mm, 48-pin QFN package, runs on less than 175mW per channel in full eight-channel mode, which means there is no need for heat shields and heat sinks.

The MxL261 features an ultra-low power single-channel battery backup/green mode, eliminating the need for up to two batteries from an embedded multimedia terminal adapter while still meeting cable operator voice call and standby time requirements during a power loss.

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