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CMD EMI filter array comes with ESD protection

Posted: 21 May 2004 ?? ?Print Version ?Bookmark and Share

Keywords:california micro devices? cmd? emi filter array? centurion? zener process?

California Micro Devices Corp. (CMD) has developed a four channel EMI filter array with ESD protection for data lines that connect the RF wireless and baseband chipsets, keypad modules, I/O data ports and buses in mobile applications such as wireless handsets and PDAs.

According to CMD, the CM1425 uses their proprietary Centurion advanced zener process, and offers a solution with 50 percent less capacitance and lower equivalent series resistance (ESR), resulting in improved high frequency attenuation characteristics.

Featuring a "pi" style (R-C-R) low-pass filter architecture, the new device offers faster roll-off and better attenuation while maintaining a cut-off frequency of 86MHz. The improved filter design provides >30dB of attenuation over the 800MHz to 2.7GHz carrier frequency range. CMD said this improved attenuation is due to a reduced filter capacitance value of 20pF, more than 50 percent lower than competing solutions. The CM1425 offers ESD protection of 15kV contact discharge.

The four-channel CM1425 is a pin-to-pin replacement for CMD's CSPRC032A, offering enhanced filter performance and the addition of low capacitance ESD protection.

The CM1425 is currently sampling, with prices starting at 40 cents each in 1,000 units. Volume production is scheduled for June 2004. Environment-friendly lead-free packages are also available, with an OptiGuard coating for increased durability.

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