I'm probably not seeing something obvious, but what's wrong with a plain old
4000 series CMOS Schmitt trigger chip? If the first stage doesn't square up fast enough, there are three Schmitts left in the package to help that out a bit.
Jim
-- "It is the mark of an educated mind to be able to entertain a thought without accepting it." --Aristotle
"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...
> I need to convert a _slow_ moving analog signal to "1" or "0",
> depending on whether it is above or below the digital threshold
> (CMOS).