Steve M. Taylor wrote:
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Hi Jeff
You will find it very hard to get 16 bit performance from controllers with embedded ADC, with care to turn the cpu to idle while an accurate reading is made.

Steve

Hard?, Try impossible, Just look at the issues raised in the appnotes for discrete 16-bit ADC's. The built in 16-bit ADC is a marketing ploy, it sounds good and everyone wants it, but try to use it and you will end up with as little hair as me.
Have fun with DISCRETE ADC's
Erik
Erik