jbdavid
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because thats how it was drawn? differential signaling is ususally indcated when outputs are NOT rail-rail outputs (lower swing means Higher speed possible) so the "real" signal is 1 if V(out+,out-) > 0 and 0 if V(out+,out-) <0
best way to tell is to look at the stage driving the comparator output .. if its a diff pair driving a constant current or resistive load, you can't get rail-rail operation.. if its a Low Speed comparator (not very likely in signal path) then you can use complementary (something like an CMOS inverter) outputs.. and the inverted version is just for convenience (probably less power than adding another inverter later?? but for a circuit drawn this way, its NOT what I would expect if I push down into the comparator.
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