Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uunet!snorkelwacker!ai-lab!mikec
From: mikec@wheaties.ai.mit.edu (Mike E. Ciholas)
Newsgroups: comp.sys.mac.hardware
Subject: Re: 5.886 MHz Crystals (was Re: Anyone built SID yet?
Message-ID: <8222@rice-chex.ai.mit.edu>
Date: 2 May 90 23:57:43 GMT
References: <20509@netnews.upenn.edu> <11220003@hpccc.HP.COM>
Reply-To: mikec@rice-chex.ai.mit.edu (Mike E. Ciholas)
Organization: MIT Artificial Intelligence Laboratory
Lines: 21

In article <11220003@hpccc.HP.COM> wille@hpccc.HP.COM (Ross Wille) writes:
>Shouldn't the A/D converter have a sample & hold in front of it?  Since
>it is using successive approximation, the input should be stable during
>the entire conversion time.  Maybe the A/D has a built-in S&H but I'd
>think not.  Maybe it just works well enough with out one.  Anybody know?
>
>-Ross

The ADC0831 has a sample and hold on it, when the conversion start pulse
comes, it samples for one high period of the conversion clock, then
ignores the input.  Very nice chip, all in all.

Look for a posting soon about SID circuit board status.  Don't anybody out
there try to buy a 1.558MHz thingy! (hint :-)

Mike Ciholas

email:  mikec@ai.mit.edu
snail:  289 Highland Ave, #108/Somerville, MA 02144
phone:  (617) 623-3563 
air:    N1909C, 1954 Cessna 170B