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ST EMI filter protects up to 15kV ESD

Posted: 29 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st? emi filter? lcd driver line? interference?

STMicroelectronics (ST) has unveiled an EMI filter for LCD driver lines that is suitable for use in mobile, computing and consumer applications that are subject to increasing interference from wireless applications such as cellphones and Bluetooth connections.

The new EMIF10-LCD01F1 is a 10-line filter designed to replace capacitor and resistor networks, and to reject rerouted and retransmitted radiation frequencies on the lines between a graphics controller and an LCD. This device also offers protection against damage from electrostatic discharges (ESD) of up to 15kV.

The EMI filter is based on a low-pass RC Pi filter, repeated 10 times on silicon and with integrated Zener diodes at each input and output for ESD protection. This new product is rated to meet IEC61000-4-2 standard level 4 ESD requirements. It is offered in a flip-chip package of the same size as the die, reducing board space and also the parasitic inductance in the leads of the product. According to ST, this helps deliver superior filtering performance across a wide frequency range, from 900MHz to 3GHz, which makes it suitable for dual- to quad-band cellphones.

The EMIF10-LCD01F1 has been designed with line capacitances that support up to 30MHz frequencies to avoid disturbing video signals. This means the filter has little impact on the rise and fall times of video signals and imposes almost no delay. Additionally, the product offers 30dB of attenuation at GSM and Bluetooth frequencies.

The EMIF10-LCD01F1 is available in a 6.9mm? flip-chip package in normal and lead-free versions and is priced at 70 cents in quantities of 100,000 units.




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