Yes I saw the date, but felt compelled to answer anyway, unaware of her status on this forum.

I had a friend who was doing some non-critical A/D conversions but was unsatisfied with the 10 bit (1:1024) resolution of his PIC and was going to employ an external A/D for the extra bits. I reminded him of the resolution and accuracy of his own DVM which was really no better. That and the fact that 10 bits over 5 volts is a resolution of about 5 mV.

Sometimes the forest can't be seen for the trees.