Wideband filter quashes noise on DisplayPort links

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 (Ω) [at 100MHz] (type): 50

Rated current: 100mA

Rated voltage: 10V

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Related Info

What is EMI?
Electromagnetic interference or EMI is an electrical disturbance (interference or noise) in a system due to natural phenomena, low-frequency waves from electromechanical devices or high-frequency waves from ICs and other electronic devices.

What does HDMI stand for?
High-Definition Multimedia Interface (HDMI) is digital, point-to-point interface for A/V signals. Introduced in 2002, it is designed as a single-cable solution for home theater and consumer electronics equipment. It is electrically similar to video-only DVI, and although it also includes audio, HDMI plugs and sockets, it is considerably smaller.

What is Filter?
In signal processing, a filter is a device or process that removes from a signal some unwanted component or feature. Filtering is a class of signal processing, the defining feature of filters being the complete or partial suppression of some aspect of the signal. Filters can be classified as analog or digital.

Wideband filter quashes noise on DisplayPort links

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