Semtech Introduces New Series of L-C Protection Devices for Color LCDs in 3G Handsets
Semtech Corp. announced the EClamp™239xP, the newest addition to Semtech’s EMIClamp™ protection portfolio. The EClamp239xP is a series of inductor-capacitor (L-C) protection devices featuring greater attenuation, steeper amplitude roll-off, and lower clamping voltage needed for high-performance color LCD interfaces in GSM and CDMA-based 3G handsets.
The EClamp239xP series includes the four-line EClamp2394P, the six-line EClamp2396P and the eight-line EClamp2398P. The EClamp239xP’s 5-pole L-C filter network has inductor values of 19nH and capacitor values of 12pF, enabling the devices to offer minimal attenuation in the passband and 30 dB minimum attenuation from 800 MHz to 2.7 GHz, suitable for 3G-based mobile phones.
Each device in this series comprises TVS diodes for electrostatic discharge (ESD) protection and an L-C network for electromagnetic interference (EMI) and radio frequency interference (RFI) filtering. Semtech’s process technology combines spiral inductance on silicon, which provides performance advantages over RC devices and discrete solutions, such as higher attenuation and lower pass-band.
The EClamp239xP 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. The EClamp239xP packages are narrow (1.6 mm) 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. The large ground pad minimizes parasitic inductance for improved ESD and filter characteristics.
The added functionality of 3G handsets, including camera, video, and Internet access, requires more parallel data lines, which boosts the amount of signal distorting EMI and RF. Semtech’s EClamp device series includes both L-C devices and resistor-capacitor (RC) devices thereby giving designers comprehensive options for ESD/EMI/RFI protection to better ensure a handset’s integrity.
The EClamp2394P is available immediately in production quantities and is priced at $0.46 each in 1,000-piece lots. The EClamp2396P is available immediately in production quantities and is priced at $0.60 each in 1,000-piece lots. The EClamp2398P is available immediately in production quantities and is priced at $0.72 each in 1,000-piece lots.
