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Filter arrays with 15kV contact discharge ESD protection

Posted: 11 Oct 2004 ?? ?Print Version ?Bookmark and Share

Keywords:california micro devices? cmd? electromagnetic interference filter array? emi filter array? cm1406?

California Micro Devices (CMD) released the first products in its new family of packaged electromagnetic interference (EMI) filter arrays with electrostatic discharge (ESD) protection.

Based on the company's Centurion advanced zener process technology, the CM1406 and CM1407 extend the benefits of Centurion to handset customers that prefer solutions utilizing traditional packaging technology.

The CM1406, a four channel EMI filter with ESD protection in a small form factor 8-lead TDFN package, provides an optimal solution for LCD and camera interfaces in clamshell wireless handsets. The second product, CM1407, supports higher resolution displays and imagers and establishes an industry first level of performance for traditional packaged solutions, the company said.

The CM1406 is implemented in a pi-style capacitor-resistor-capacitor (15pF-200 ohms-15pF) configuration with flow through routing for each channel. According to CMD, the 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. As a result, the CM1406 is able to attenuate unwanted signals at 35dB over the carrier band frequency range of 800MHz to 2.7GHz. Meanwhile, the CM1406 features a cut-off frequency of 105MHz, which is ideal for filtering signals to color LCD display and camera imager interfaces handling rates up to 40Mbps per data line.

The CM1407 is implemented in a 7.5pF-200 ohms-7.5pF configuration and is pin compatible with the CM1406. With 50 percent less capacitance than the CM1406, the CM1407 features a cut-off frequency of 210MHz. Using the CM1407 in wireless handsets will enable design engineers to effectively filter out unwanted high frequency noise for high resolution LCD displays and megapixel camera imagers handling rates up to 80Mbps per data line, claimed CMD. Both solutions offer an ESD protection of 15kV contact discharge.

The CM1406 is available in already production volume, with pricing starting at 43 cents each in 1,000 units. Pricing also starts at 43 cents for the CM1407, with samples to be available next month. Volume production for the CM1407 is scheduled in January 2005.

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