I wrote:
The LT1720** works on a 3.3v single supply, and has internal
hysteresis. Just ground one input, ground the other through a
resistor, and attach your AC-coupled signal (best if you can use
equal resistors to ground on the two inputs, but if the signal
termination is 50 ohms the other input can be 0 ohms to ground; even
1k ohm would probably be OK).
Note that the LT1720 is specified for inputs to 100mV below V-
(ground, in this case) and your 200mVpp signal pushes it right to
the limit. A bit of attenuation is probably a good idea.
** The 1720 is a dual comparator, so you'd have an extra to use or
ignore. Alternatively, the 1719 is a single with extra features
that you could ignore. Either should work well in your application.
See attached schematic.
Best regards,
Charles
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