Compact chokes clean up high-speed signals

New compact low-profile film-type choke coils help designers suppress common-mode noise on high speed differential signal lines, without distortion.

For designers seeking to suppress common mode noise on high speed differential signal lines, without distortion, Murata has announced the DLP0NS Series of compact low-profile film-type common-mode choke coils.

Taking advantage of Murata's advanced microfabrication film technology and superior ferrite materials, the DLP0NS coils are ultracompact and provide accurate transmission of high-speed differential signals.

Common mode choke coil circuits are increasingly being used for the effective suppression of common mode noise without distorting the waveform of high-speed signals.

The DLP0NS chip coils measure just 0.85 x 0.65 x 0.45mm in profile, with a tight +/-0.05mm dimensional tolerance, making them ideal for today's high speed portable products, particularly those incorporating USB2.0, IEEE1349 or LVDS protocols, as well as in HDMI and DVI applications.

Impedance characteristics of devices in the series are specified at 67, 90 or 120ohm at 100MHz.

Rated current is 110, 100 and 90mA, respectively, and rated voltage is 5V DC.

Insulation resistance is quoted at 100Mohm minimum, and DC resistance is 2.4, 3 and 3.8ohm +/-25%, respectively.

Operating temperature range is -40 to +85C.

Specific applications for Murata's chip common-mode choke coils include noise suppression in devices using the IEEE1394 bus interfaces, connecting computers and audio/video systems with other peripheral equipment.

Other applications include LVDS lines of notebook computers and LCDs, and USB lines of PCs, notebook computers, digital stills cameras and digital video cameras.

The DLP0NS common mode choke coils are available now in production volumes and can be supplied bulk or taped and reeled.

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