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CMD's ASIP filter arrays offer superior EMI filtering performance

Posted: 06 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:california micro devices? cmd? centurion asip? application specific integrated passive? emi filter array?

Housed in 0.4mm pitch TDFN packageCalifornia Micro Devices (CMD) has unveiled a family of packaged Centurion ASIP (Application Specific Integrated Passive) EMI filter arrays that promises superior EMI filtering performance combined with robust ESD protection in the most compact package available for use in mobile handsets.

The new Centurion CM1430 and CM1431 ASIP devices are housed in a 0.4mm pitch TDFN package that produces space savings of up to 42 percent when compared to existing 0.5mm pitch TDFN packages.

With the adoption of higher resolution color displays and camera imagers spreading to a larger segment of the handset market, there is a growing need for EMI filters that offer higher cutoff frequencies while providing a greater level of attenuation performance at the frequency band of 800MHz through 3GHz, said CMD. The CM1430 and CM1431 devices are the first packaged EMI filters that meet these exacting requirements in a form factor fully optimized for use in space constrained, mobile handset applications, the company added.

Both the CM1430 and CM1431 utilize C-R-C pi filters with values of 8.5pF-100?-8.5pF and 15pF-100?-15pF respectively corresponding to cutoff frequencies of 200MHz and 120MHz. The high cutoff frequencies make these new products suitable for filtering high resolution display and camera modules interfaces, which utilize data rates up to 80Mbps.

The CM1430 and CM1431 achieve attenuation of -25dB and -35dB, respectively at 1GHz, and the attenuation of both parts is -35dB at 3GHz. Both products feature flow through routing for each filter channel which contributes to enhanced filter performance and ease of PCB layout. Additionally, CMD said, superior filter performance across all channels is achieved through the large area ground pad on the bottom of the TDFN package that minimizes parasitic inductance. In addition to filtering, both products also provide ESD protection up to -15kV contact discharge per IEC61000-4-2 Level 4 specification.

The two filter arrays are both available in 4, 6 and 8 channel configurations. The package dimensions of the 4, 6 and 8 channel versions are 1.7-by-1.35mm (8 leads), 2.5-by-1.35mm (12 leads), and 3.3-by-1.35mm (16 leads), respectively. Each of these packages is available in Pb-free finish.

Samples of the CM1430 and CM1431 are already available. Sample pricing ranges between 42 cents and 59 cents each in 1,000-unit quantities, depending on the channel configuration. Production for both families is scheduled for Q3 2005.

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