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Using the MAX4929E for HDMI/DVI low-frequency switching

Posted: 04 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:HDMI switch? DVI? digital video standard?

The world of video transmission has undergone a nearly complete transition from analog to digital links in recent years. VGA and component videoanalog video linksare being replaced by HDMI and DVI. These two digital video standards have nearly identical requirements, and must handle a set of high-frequency and low frequency signals simultaneously. The DVI specification was finalized in 1999, and the HDMI specification is in version 1.3 at the time of this writing. Both specifications use Transition Minimized Differential Signaling (TMDS) for the high-frequency (video) portion of the data. The TMDS signal carries R, G, B and clock through four differential pairs, which occupy 8 pins of a 19-pin connector. Both HDMI and DVI are designed to be "plug and play" where the monitor (sink) and the source link up and find a way to function together at optimal performance. Many new TMDS HDTV chips include two complete sets of TMDS (high-frequency) inputs, but cannot address the LoF (low-frequency) signals.

The MAX4929E is a low-frequency HDMI/DVI switch, designed for use in a monitor or HDTV receiver.

The device handles all the low-frequency signals that must be switched, and is a companion part to the new MAX4886 TMDS switch or any TMDS receiver with two inputs.

Please view the PDF document for more information.

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