LSB of a 16 bit value is 1/2^16, or 1/65536, or aprox 0.0000153,
or 0.00153 %, or  15 ppm.

You'll probably need *very* advanced analog curcuit to reach that
kind of resolution !! Note that a typical Polypropylen cap (from Farnell)
have  a temp coeff of 200 ppm/deg C. You can get a Polystyrene cap with
down to +- 60 ppm/deg C. Still much higher then the LSB of a 16 bit value.

Even 10 bits of resolution gives a LSB that is aprox 0.098 % of
full scale. Even that is hard to get in a repeateble way.

May I ask,  *what* needs a 16 bit A/D value ?

Jan-Erik Svderholm.

>Whole purpose of using PIC14000 was for 16 bit adc, if I can't get 16 bit
>resolution, I will have to trash the project.
>
>Thanks.
>Vyas


Jan-Erik Svderholm
S:t Anna Data
tel : +46 121 42161
mob : +46 70 5241690

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