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HDMI/DVI cable devices offer 15dB signal-loss compensation

Posted: 16 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:HDMI 1.3? DVI cable devices? signal loss compensation?

Maxim Integrated Products has introduced the MAX3814 TMDS digital video equalizer and cable driver for HDMI and DVI applications.

The MAX3814 builds upon the digital video signal integrity established by Maxim's MAX3815 equalizer product for long DVI/HDMI cables. Though typical HDMI/DVI output drivers contribute to signal-reflection problems between connectors and high-impedance (open) HDMI/DVI transmitter outputs, the MAX3814 offers a selectable 50 percent higher output current for the use of 200 back-termination resistors that absorb output reflections. Moreover, its input provides 15dB of signal-loss compensation for long cables (up to 20m of 24 AWG cable) or circuit-board traces (up to 80in/2m of FR4 circuit board). This ability to absorb reflections and provide signal-loss compensation make the MAX3814 well suited for notebook docking stations, HDMI inputs for HDTVs and HDMI TMDS outputs.

Unlike conventional output drivers that require the separation of I/O connectors from their respective interface ICs, MAX3814's small, 5mm x 5mm footprint allows it to be placed right at the HDMI or DVI interface. All four of its inputs and outputs behave identically to allow flexibility in pin assignment for optimal signal routing on a circuit board.

MAX3814 is compatible with HDMI 1.3 and is available in a small, 32-pin TQFN package that is fully specified over the 0C to 85C temperature range. Prices start at $1.95 for 1,000-unit quantities. An evaluation kit will be available to speed designs.

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