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EMI filters integrate diodes for ESD protection

Posted: 12 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:EMI filter array? ESD diode protection? graphics controller?

OnChip has introduced a family of EMI low-pass RC Pi filter arrays with on-board diodes for ESD protection.

Offered in flip chip style chip scale packages (CSP), the devices are designed for high-speed data LCD and memory card interfaces in mobile phones, PDAs and MP3 players. They provide high electrical performance across a wide frequency range as well as board space savings. The OC1425 is a 4-channel EMI filter while the EMF4020 and the OC1442 are 8-channel EMI filter arrays. All three devices are designed to reject rerouted and retransmitted radiation frequencies on the lines between the graphics controller and the LCD. Designed with line capacitance that support up to 30MHz frequencies and minimize impact on the rise and fall times of video signals, these devices are capable of attenuating unwanted signals over the RF band between 800MHz and 3GHz.

Additionally, they have built-in Zener diodes that protect the LCD controller and the I/O ports against damage from ESD of up to 15kV rated to meet IEC61000-4-2 standard level 4 ESD requirements.

The filters are offered in a flip-chip package, reducing board space and also minimizing the package parasitics, delivering S21 characteristics with low parasitic inductance of 10pH. They have a very low profile of 0.65mm or less than 0.03-inch.

OnChip has also introduced EMF1402 for SIM Card I/O port and EMF1423 for Secure Digital Card I/O port EMI Filtering and ESD protection used in mobile devices. These devices are also offered in the same low-profile CSP format.

Pricing ranges from 11 cents to 25 cents. Devices are available immediately.

- Ismini Scouras

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