From: "Bill Sloman"
Subject: Re: digital voltmeter and ammeter
Date: Sun, 19 Jan 2003 17:37:45 +0100
Organization: Planet Internet
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NNTP-Posting-Date: 19 Jan 2003 16:38:07 GMT
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"Alex Graham" wrote in message
> Thanks for your suggestions.
> Im trying not to make this _too_ complex, it being an A level project
> (last year of school), so what Im really trying to do is simply use an
> ADC that I can plug into a protoboard and get cracking with...
For this sort of relatively slow measurement, I'd be greatly tempted by one
of the Linear Technology LTC24xx parts
I've not used any of them, and it has been claimed that the Cirrus Logic
CS5505-8 series of parts are at least as good
and when I used what was then the Crystal Semiconductor CS5508 back in 1992
it worked very well, but the Linear Technology parts do look as if they will
be easier to use.
I certainly managed to misunderstand the CS5508 data sheet back in 1992, and
the Linear Technology data sheets do look a lot clearer.
A 24-bit A/D converters - closer to 20-bits in reality - may look like an
overkill for an A-level project, but they come with a lot of built-in
digital filtering, specifically designed to reject 50Hz and 60Hz noise,
which makes them a lot more attractuve than the fast 10-bit A/D converters
you get in an up-market PIC.
Bill Sloman, Nijmegen