Re: Saab mic

Posted by czabel on
URL: http://bluesaab-forum.90.s1.nabble.com/Saab-mic-tp6p1469.html

Quick update, I've got some information from the support staff at Microchip:

The MIC_BIAS line is regulated to provide anywhere from 0.199 to 1.299 mA at 2V nominal. The voltage is constant, and is specified to be +/- 10% of nominal.

When asked about the specified "large resistor to ground" in the datasheet, he replied that should imply a value of 100k, but it might be up to 1Meg in some cases. Either way, doesn't really matter, as the mic needs upwards of 4.5V to operate properly.

So the way I see it, we have two options: A new board revision with an external bias circuit, or we add an electret mic to the BOM and tell people to swap out the Saab Mic assembly for the new one.

Any thoughts?