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R-C filters protect LCD interfaces in 3G handsets

Posted: 13 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:R-C filters? color LCD interfaces? 3G handsets?

EClamp 238xP

Semtech Corp. has released the EClamp 238xP, a family of resistor-capacitor (R-C) protection devices with the low capacitance, high attenuation and low clamping voltage needed for high-frequency color LCD interfaces used in GSM and CDMA-based 3G handsets.

The EClamp238xP series, part of the EMIClamp protection portfolio, includes the four-line EClamp2384P, the six-line EClamp2386P and the eight-line EClamp2388P. The EClamp238xP's two-pole R-C filter network has a 200 resistor and two 12pF capacitors, enabling the devices to offer minimal attenuation in the passband and 30dB minimum attenuation from 800MHz to 2.7GHz, which is suitable for GSM, CDMA or 3G-based mobile phones.

Each device in the family includes TVS diodes for ESD protection and a R-C network for EMI and RF interference (RFI) filtering. The high integration of the EClamp238xP devices replaces 32 discrete passive devices in a typical handset design. The devices offer ESD protection to IEC 61000-4-2 Level 4 (15 kV air; 8 kV contact).

The EClamp238xP devices are available in the RoHS/WEEE-compliant Semtech Leadless Package (SLP), which offers the same small, low-profile design as "flip chip" alternatives, but with increased manufacturing durability, according to Semtech.

The EClamp238xP packages are narrow (1.6mm) and low profile (0.58mm) with a variable length depending on the number of lines supported. The flow-through design of the devices alleviates the need for signal routing for a faster and more convenient layout, said Semtech.

The EClamp2384P, EClamp2386P and EClamp2388P are available immediately in production quantities. Each EClamp device is priced at 32 cents each in 1,000-piece lots.

- Gina Roos

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