> However do remember that a PIC needs a ref of around 2.5V to work correctly.
> So a reference of 2.048 would give 0.2F per bit, so 2.560V reference would
> give 0.25F as your LSB. You should be able to set up a reference using a low
> power LM317 and a couple of resistors to this voltage, if a suitable off the
> shelf one is not available.


Thanks again for everyone's input.  I am ordering a 2.5v reference
voltage generator from Microchip.

You all help me realize that by using a 5V reference while the max
signal was 1v, I was only getting 1/5 of the possible resolution,
which is really bad.

As Alan pointed out, I can get .2F per bit using 2.5v as the
reference.  If I can make make an amplifier to multiply my 0-1V signal
by 2 thae I will get more resolution.

Mark Bellamy

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist