Leslie Newell wrote: > > Another odd thing - in differential mode if I disconnect one line the > input toggles randomly, obviously picking up noise. Again, shouldn't a > balanced input give no output with one line disconnected? > > No. Unless either a bias is added to the inputs, or the comparator has significant hysteresis, when the comparator has the same voltage on both inputs, it can't make a decision. So, you get noise - ie, it is bouncing between yes and no.
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