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ESD-protection chip ideal for cellphones

Posted: 13 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:ESD protection? ESD IC? cellphone music player?

EMIF04-EAR02M8

STMicroelectronics has introduced EMIF04-EAR02M8, an ESD-protection IC that suits portable music players and feature phones.

The new device is ideal for cellphones being shipped with music-playback capabilities, which iSuppli predicts will grow to exceed one billion handsets annually by 2010, representing more than 90 percent of the market. It will also protect other portable music devices against interference from nearby cellphones.

The EMIF04-EAR02M8, measuring 1.5mm x 1.7mm, can replace a network of discrete components or two separate ICs, normally designed into the music player's headset-connection circuitry, saving as much as 72 percent of PCB space. High attenuation of signals at frequencies from 900MHz to 1,900MHz allows use in handsets for all cellular standards, as well as multiband products, without lengthy fine-tuning of each design.

Although a small number of single-chip alternatives are available, only ST's filtering and protection IC provides circuits individually optimized for the earphone and microphone connections, which require different filter characteristics. ST has achieved this by combining its existing EMIF02-MIC03M6 and EMIF02-SPK02F2 for microphone and speaker interfaces into a single integrated device. Features to help maximize handset battery life include low-resistance earphone circuitry (0.3), resulting in efficient driving of the speakers.

The new IC provides required protection against ESD capable of damaging the handset's internal components. By protecting against ESD spikes up to 30kV in direct contact with the signal connections, this new device is more effective than passive ESD-protection components.

The EMIF04-EAR02M8 is available in a micro-QFN 8-lead package, priced at $0.24 for orders over 10,000 units.





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