USB2.0-compatible low profile chip common mode choke coils

9 April 2003 Circuit & System Protection

Murata has introduced a new series of chip common mode choke coils. The DLP11 series provide high levels of EMI noise suppression in high-speed differential mode signal transmission lines such as USB2.0. They are compact, low profile, and are said to be the smallest USB2.0 common mode choke coils available.

Murata thin film and ferrite material technologies have produced choke coils that handle high-speed data transmission in a compact and low profile volume of 1,25 x 1,0 x 0,82 mm. With an electrode pitch of 0,55 mm, they contribute to high density mounting in compact designs like mobile equipment. Moreover, with a magnetic coupling factor of 0,98 or more, the differential mode impedance that may cause signal waveform distortion in the signal pass band is reduced to low values. As a result, common mode noise is effectively removed without influencing high-speed signal waveforms.

A lineup of four values is available, with common mode impedance values of 90, 120, 160 or 200 Ω (at 100 MHz).

With data processing speeds in personal computers and their peripherals becoming faster and faster, high-speed differential signals such as USB2.0, IEEE1394, and LVDS serving as interfaces between computers and peripherals have become widespread. A common mode choke coil that effectively removes noise without influencing signal waveforms is useful as noise suppression in high-speed differential mode signal transmission lines.

Applications are for noise suppression in high speed differential signal lines of compact, mobile equipment such as digital still cameras, video cameras, mobile phones, PDAs, and notebook computers; noise suppression in USB2.0 (High-Speed) D+/D-lines; noise suppression in IEEE1394 TPA± TPB± lines; noise suppression in clock and data lines such as LVDS/DVI (TMDS).

For more information contact Avnet Kopp, 011 809 6100, [email protected], www.avnet.co.za

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