Hello,
The hysteresis example on page 20 of the LMH7220 data sheet depicts a typical single ended comparator topology.
For the same input topology but for LVDS differential outputs how would the hysteresis feedback be connected?
Regards
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Hello,
The hysteresis example on page 20 of the LMH7220 data sheet depicts a typical single ended comparator topology.
For the same input topology but for LVDS differential outputs how would the hysteresis feedback be connected?
Regards
Hello Aramis,
The inputs are single ended - so the hysteresis feedback needs to come from just one of the outputs.
From the non-inverting output (Q) to the non-inverting (+) input,
or,
From the inverting output (/Q) to the inverting input (-).
But not both!
So the standard theory and equations for hysteresis apply. However, the LVDS outputs complicate things. Remember that the LVDS outputs have a ±325mV swing around 1.2V (1.0375V to 1.3625V), so you must use these numbers for the output VOL and VOH in the calculations.
For more info on hysteresis, see the TI Precision Labs on comparators (Section 14.2):