Atlanta, Ga. California Micro Devices has unveiled its new CM1424 electromagnetic interference (EMI) filter array with electrostatic discharge (ESD) protection at CTIA Wireless 2004. The company claims the new device is the industry's first EMI filter with ESD protection for multimedia memory card (MMC) interfaces, which are becoming increasingly popular in wireless handset and mobile electronics devices.
The CM1424 is a three-channel EMI filter array with two dedicated channels of ESD protection, which provides a complete solution for the MMC interface. Integrating 17 discrete components in a chip scale package (CSP) Application Specific Integrated Passive (ASIP) device, it provides up to 89% board space savings versus discrete implementations, said the company.
Using California Micro Devices' Centurion process for EMI filtering with ESD protection, the CM1424 provides two-way EMI filtering with three internal CRC pi filters (12 pF/100 ohms/12 pF) capable of attenuating unwanted signals by more than 30 dB over the 1 GHz to 3 GHz carrier frequency range.
The filters feature a cut-off frequency of 130 MHz, and block unwanted signals originating from internal RF components as well as harmonics generated by the MMC interface's high-speed clock and data lines.
MMC cards can be subjected to considerable handling. As a result, the MMC data, control and power lines require robust ESD protection to prevent harmful ESD strikes from damaging the internal MMC controller. The CM1424 features three filter channels with ESD for protection of the data and control lines, one dedicated ESD channel for protection of the power supply and one additional dedicated ESD line for auxiliary use. All channels are able to withstand ESD strikes of ±15kV contact discharge, exceeding the IEC61000-4-2 Level 4 specification.
Available now, pricing for the CM1424 starts at $0.43 each in quantities of 1,000. Lead free packaging and OptiGuard coated versions are also available.
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