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Wideband filter quashes noise on DisplayPort links

Posted: 17 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:filter? EMI? HDMI? noise?

TDK Corp. announced that it has developed a wideband thin-film common mode filter for EMI suppression on DisplayPort interfaces, an industry first. The new product which carries the designation TCM1210U-500-2P will be available this month.

The new filter measures 1.25mm x 1mm x 0.6mm and is designed specifically to suppress noise on DisplayPort connections, a new standard for signal transmission between computers or audiovisual equipment and display monitors at speeds that exceed even HDMI (2.25Gbit/s). A DisplayPort link uses up to four lines, each rated for 2.7Gbit/s, resulting in a total transfer rate of 10.8Gbit/s. The demand for EMI suppression components in this area is expected to grow significantly in the near future.

To create a product to meet this demand, TDK applied its industry-leading expertise in thin-film magnetic head technology (including original fine pattern conductor formation and film formation technologies). With a cut-off frequency of 8.0GHz, the rating of the new filter is 2GHz higher than that of the existing thin-film common mode filter for HDMI (TCM1210H-900-2P). As a result, the filter offers effective noise control without degrading the outstanding transmission characteristics of high-speed differential transmission line signals.

Main applications:

  • EMI countermeasures on high-speed data transmission lines in notebook computers, audiovisual equipment and other electronic devices.

    Main features:

  • Industry's first common mode filter for DisplayPort interfaces
  • Cutoff frequency raised to 8GHz to support high-speed data transmission

    Main characteristics:

  • Product designation: TCM1210U-500-2P
  • Common mode impedance () [at 100MHz] (type): 50
  • Rated current: 100mA
  • Rated voltage: 10V

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