Milpitas, Calif. California Micro Devices has unveiled its first products in a new family of packaged electromagnetic interference (EMI) filter arrays with electrostatic discharge (ESD) protection. Based on the company's Centurion advanced zener process technology that enables a high level of ESD protection at a lower capacitance, the new CM1406 and CM1407 devices extend the benefits of the technology to handset designers that prefer solutions using traditional packaging technology.
The CM1406, a four-channel EMI filter with ESD protection in a small form factor 8-lead TDFN package, is suitable for LCD and camera interfaces in clamshell wireless handsets. The CM1407, with 50% lower capacitance than the CM1406, supports higher resolution displays and imagers. The company says the CM1047 establishes an industry first level of performance for traditional packaged solutions.
A perfect fit for color LCD displays and camera imagers, the CM1406 is implemented in a pi-style capacitor-resistor-capacitor (15 pF-200 W-15 pF) configuration with flow through routing for each channel. The company says 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 800 MHz to 2.7 GHz. The CM1406 features a cut-off frequency of 105 MHz, which is ideal for filtering signals to color LCD display and camera imager interfaces handling rates up to 40 Mbit/s per data line.
The CM1407 is implemented in a 7.5 pF-200W-7.5 pF configuration and is pin compatible with the CM1406. The CM1407 features a cut-off frequency of 210 MHz. 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 80 Mbit/s per data line. Both solutions offer ESD protection of *15 kV contact discharge.
Pricing for the CM1406 starts at $0.43 each in 1,000 units and is available in production volume. Pricing starts at $0.43 for the CM1407 and samples will be available in November 2004, with volume production scheduled for January 2005.
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