Audio jack detection, configuration switch simplifies design

Audio jack detection, configuration switch simplifies design

The FSA8008 audio jack detection and configuration switch is a one-chip audio jack detector and switch for three- or four-pole accessories. While current solutions use several discrete components (dual comparator, analog switch and MOSFET) with software control, this device integrates all these functions into a single device, simplifying designs, and saving up to 70% of the board space and up to 15% BOM costs.

In addition to detection, the FSA8008 is designed to allow third-party headphones to be used for listening to music, which is made possible due to an integrated microphone (MIC) switch that allows the processor to configure the audio jack. The device eliminates leakage current when the MIC is plugged into the jack and eliminates as well the insertion pop and click noise on the MIC path when the jack touches the MIC bias first. Additionally, the FSA8008 eliminates the software work-around needed when the send/end key is pressed or stuck. Housed in a 10-lead UMLP package, the device also 15-kV (air gap) and 12-kV (HBM) ESD protection, as well as 0.01% typical total harmonic distortion (MIC). ($0.33 ea/1,000 — samples available now.)

Fairchild Semiconductor , South Portland , ME
Sales 207-775-8100
www.fairchildsemi.com