> If you really need more than
> 12 bit A/D then you have to use an external A/D with a PIC or some 
> other
> micro that has wider A/D like Cygnal.

If speed is not an issue then a Sigma Delta A2D will easily give you 
more bits with a few passive external components. And if you have a 
multiplexed internal A2D that shares the mux with a comparator (as 
some do) then you can add multiple channel Sigma Delta with typically 
two resistors and a capacitor.


        RM



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