>The big problem at the moment is finding a bidirectional
>isolator (good to 25V) for PGC and PGD that doesn't have
>an insane forward voltage drop or suffer from contact bounce.
>I'd still be tempted to use a relay or an SCR crowbar
>for the overvoltage protection though.

I would have thought that something like a DG301 or something of that ilk
would be the "bees knees". I believe Analog Devices have newer members of
this family with the modern high ESD protection and the like.

(pause while digging in messy heap of brochures)

This looks like what I was thinking about.

ADG88x, ADG85x, and ADG819 look to be possibles.

ADG1409 is described as a high voltage multiplexer, sampling now, production
available mid 2006.

ADG12xx family are +/-15V switches and muxes. Visit
http://www.analog.com/iCMOS for more info.

That loks to be the best from Analog Devices.




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