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LC EMI filters guard wireless data interfaces

Posted: 12 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:LC EMI filters? inductor-capacitor filters? wireless data interfaces?

California Micro Devices has expanded its portfolio of EMI filters for high-bandwidth applications in mobile handsets with the introduction of the CM1692 family of inductor-capacitor (LC) filters. The CM1692 devices, based on the company's new Praetorian II architecture, allow mobile handset designers to address many higher bandwidth data interfaces that cannot be handled by resistor-capacitor (RC) based filters.

Targeted at intermediate applications between lower cost RC filters and higher performance, higher cost Praetorian I devices, the CM1692 family includes three different products &151; the 4-channel CM1692-04DE, 6-channel CM1692-06DE and 8-channel CM1692-08DEto provide maximum layout and placement flexibility for wireless handset designers. These LC EMI filters offer robust ESD protection, and are suitable for protecting a variety of high bandwidth data interfaces found in most advanced handsets that cannot be handled by RC filters. These interfaces typically employ clock frequencies greater than 50MHz and include applications such as camera modules with resolutions greater than 3Mpixels, high resolution LCDs and removable memory modules with capacities greater than 2Gbytes.

Key performance attributes of the CM1692 family's three pole C-L-C architecture (12pF-17nH-12pF per channel) include high cutoff frequencies of up to 400MHz, and a broad stop band ranging from 800MHz up to 3GHz that covers all wireless communication frequencies. The family also touts superior signal integrity with rise times as low as 2ns, which cannot be achieved with RC filters according to CMD, and minimal insertion loss of The CM1692-04DE, CM1692-06DE and CM1692-08DE devices are priced between 10 and 20 cents each in quantities of 1,000, depending on channel configuration. All devices are available in volume production.

- Gina Roos

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