Abacus Polar – Miniature filter cleans EMI off high-speed data lines

A new common-mode filter specifically designed to address the challenge of

clearing EMI off high-speed data and signal lines without distortion, has

been introduced by Abacus Polar. The company has also announced a series of

winding type chip inductors, for audio/video, computer, mobile phone and

industrial applications.

The TDK ACM2012 ferrite chip common-mode filters are aimed at audio, video

and other high-speed differential mode transmission, and cause almost no

distortion to high-speed signals, says the company. The series offers four

specifications, including versions optimized for USB2.0 (480Mbps) and

IEEE1394 (400Mbps/100Mbps). The series is aimed at audio-video equipment

that uses HDMI.

High-precision formation technology, automatic coiling and terminal

connection technologies of the TDK micro core units, achieve a coupling

coefficient between coils of more than 0.99. While improving the removal of

common-mode elements accumulated on signal lines, the deterioration of

signal waves by differential mode impedance has been reduced to one of the

lowest levels in the industry. The outstanding performance is achieved

within a form factor believed to be smaller than any comparable common-mode

filter, with a footprint of just 1.3mm x 2mm, says the company.. The devices

are fully RoHS compliant and satisfy the strict HDMI TDR standard

The GLF Series of chip inductors is magnetically shielded and available in

the case sizes GLF1608 (0603), GLF2012 (0805) and GLF2518 (1008) as well as

the low-profile versions GLF201208 and GLF251812. The GLC2518 (1008) Series

is a power inductor with a very small case size for applications which need

a high current – such as AC/DC inverters or small DC-DC converters