> Anybody have any idea how accurate a sigma-delta A/D you can build 
> using the comparator in the PIC?

AFAIR Scott Datallo achieved about 12 bits (or was that 10?) using PIC 
pins alone, without using a comparator. So you should be able to do 
substantially better using a "real" comparator. With a comparator I 
think the main issue would be offset so you should be able to achieve 
extremely good resolution with an SD converter - I'd guess 16-20 bit 
range.


        RM

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