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Spread-spectrum clocking reception for displays

Posted: 12 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:LVDS interfaces? spread-spectrum clocking? displays?

Consumer display applications like flat-panel displays and video players commonly use high-speed low voltage differential signaling (LVDS) interfaces to transfer video data. To address electromagnetic compatibility (EMC) issues, spread-spectrum clocking can be used to reduce th impact of radiated energy produced by these signals. When a spread-spectrum clock is used as the source from which these signals are derived, the radiated energy is spread across a range of frequencies, effectively reducing the peak energy at any one frequency.

This application note shows that a spread-spectrum clock will drive the LVDS interfaces of Spartan-3E and Extended Spartan-3A family devices with no adverse effects on a system's performance. It describes how to estimate the maximum spread-spectrum clock modulation frequency for the Digital Clock Manager (DCM) and describes a simple test setup to evaluate the effects of the spread-spectrum clock on a typical LVDS communications path. Note: This application note applies to Spartan-3E and Extended Spartan-3A family devices only.

View the PDF document for more information.

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