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From: stevel@tybalt.caltech.edu (Steve Ludtke)
Newsgroups: sci.electronics
Subject: A/D converter getting hot
Message-ID: <9513@cit-vax.Caltech.Edu>
Date: 12 Feb 89 10:11:21 GMT
Sender: news@cit-vax.Caltech.Edu
Reply-To: stevel@tybalt.caltech.edu (Steve Ludtke)
Organization: California Institute of Technology
Lines: 17

Hello. I've been building various digitizing and sampling circuits using
the ADC0820CCN A/D converter. The chip operates fine usually, but then
quite randomly, it stops working and begins to get hot. It all happens
reasonably quickly, it takes ~4 sec to get hot enough to burn my finger,
and if it's left in this state for more than 1 or 2 min. the chip will
(not surprisingly) die. It also occasionally does this immediately after
I apply power. I'm using the chip completely within the rated limits,
in the RD mode. I have a ~50uf capacitor across the power supply to filter
out any transients when it powers up. Has anyone experienced this, or a 
similar problem with this chip ??? They cost about $10 each, and I'm getting
tired of replacing them ... Any suggestions would be greatly appreciated.

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Steve Ludtke
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