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From: stevel@tybalt.caltech.edu (Steve Ludtke)
Newsgroups: sci.electronics
Subject: ACD0820 getting hot
Message-ID: <9613@cit-vax.Caltech.Edu>
Date: 17 Feb 89 00:20:16 GMT
Sender: news@cit-vax.Caltech.Edu
Reply-To: stevel@tybalt.caltech.edu (Steve Ludtke)
Organization: California Institute of Technology
Lines: 16

Thank you to everyone who responded to my problem with an ADC0820 that
was heating up. With the advice I recieved I finally found the cause of the
problem. I'm posting the cause in case there are any other poor uneducated
souls out there who might have similar problems. The way I have the chip
connected has several of the i/o lines tied directly to a port on my computer,
with the chip itself powered externally. If any logic signals are going into
the chip when Vcc is applied, the chip goes into a self-destruct mode. What
this means is I simply have to make sure I apply power to the chip before 
turning on the computer, and be sure there aren't any interruptions to Vcc
while it's operating. Thanks again for all the advice. 

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Steve Ludtke
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