The FSA8069 is an audio jack detection switch for 3.5 mm and 2.5 mm headsets. The FSA8069 features impedance detection and moisture sensing, which prevents false detection of accessories in the audio jack. An integrated MIC switch allows a processor to configure attached accessories. An LDO provides DC bias to microphone and remote key circuit in accessory. The FSA8069 detects seven headset impedance steps and supports configurable gain in the amplifier according to the type of load. The architecture is designed to allow headphones to be used for listening to music from mobile handsets, personal media players, and portable peripheral devices.
Features
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Detection:
Accessory Plug-In
Send / End Key Press
Impedance Detection
Prevents False Detection due to Moisture
VDD: 3.0 V to 4.5 V
VIO: 1.6 V to VDD
THD (MIC): 0.01% Typical
15 kV Air Gap ESD
Detects 7 Steps of Headset Impedance
Integrates LDO for MIC Bias Circuit
MIC Switch Removes Audio Jack “Pop” and “Click” Caused by MIC Bias
