Two Flip Chip ICs Filter Out EMI and Protect Against ESD

Irvine, Calif. — Microsemi Corp.'s pair of flip chip ICs filter out electromagnetic interference (EMI) and protect against electrostatic discharge (ESD) damage in portable audio electronic applications, protecting earpiece speaker and microphone ports.

The proliferation of cell phone and wireless LAN operation increases the need to filter interference from cell phone frequencies of 800-900 MHz as well as WLAN frequencies of 2.4 GHz to 6 GHz in audio applications that include cell phones, PDA's, MP3 players, notebook computers and digital camcorders.

Designated the LX7205 and LX7206, both of the flip chips are designed to filter this interference from earpiece speaker ports. The LX7206 also filters microphone ports. Integrated into both devices is bi-directional protection from both positive and negative electrostatic discharge voltages.

“Using 3 x 2 array flip chip construction makes our new EMI filters particularly well suited for portable applications,” said Paul Bibeau, vice president and general manager of Microsemi's Integrated Products Group. “Their largest dimension is only 1.5 mm long — and by eliminating leadframes and bond wires we minimize inductance and provide superior high frequency filtering,” he said.

Other features of the new flip chips include a transient voltage suppression (TVS) operating voltage of only 5.0 V, and low leakage current specifications.

Both the LX7205 and LX7206 are priced at 31 cents in 10,000-piece quantities, and are available for immediate sampling and volume delivery.

Clickhere for the LX7205 data sheet

Clickhere for the LX7206 data sheet

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