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From: "Bill Sloman"
Subject: Re: Niosy A/D converter - an advantage ?
Date: Thu, 14 Nov 2002 23:43:54 +0100
Organization: Planet Internet
NNTP-Posting-Date: 14 Nov 2002 22:43:51 GMT
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
"Roger Lascelles" wrote in message
> We have 12 bit ADC in a product. Due to grounding problems, the ADC
> readings fluctuate - I don't know exactly by how much, but lets say at
> the last two bits dither around. The noise is digital hash from the
> microprocessor which has external RAM and ROM.
> Because the AD for is only used to measure periodic or DC quantities, the
> programmer has added a lot of averaging code which produces smooth
> to an equivalent of 13 bits resolution. He claims that the noise is an
> advantage, because it dithers the AD to permit averaging.
> Has anybody got experience of ADC dithering / noisy ADCs ? What are the
> dangers or limitiations with this sort of thing ? Are there gotchas with
> some types of noise ? Do you know of any articles or web links which
> help ?
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