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Subject: Re: Circuit that combines 2 x 8-bit ADCs to get 1 higher resolution ADC

Date: 09/28/00 at 12:40 PM
Posted by: Bill Sloman
E-mail: bill.sloman@ieee.org
Message Posted:

In Reply to: Re: Circuit that combines 2 x 8-bit ADCs to get 1 higher resolution ADC posted by JaaC on 09/28/00 at 4:37 AM:

Start off with "The Art of Electronics" by Paul Horowitz and Winfield Hill, and if that doesn't give you enough detail,
check out one of the specialist texts listed in the back of their book.

It really is dumb newby stuff - the point is that ADC's don't divide up their range into 256 or 1024 exactly equal
parts, and if you read the specs for any ADC carefully, you will find that there is a tolerance on the position of
each least significant bit, which is typically around half the least significant bit, though I've seen as much as
two significant bits worth of error.

Trying to use a second ADC to sub-divide these unequal (and sometimes negative) intervals is a total waste
of time.
Bill Sloman, Nijmegen


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