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Eval ADCMP580

I have the Eval board for ADCMP580 comparator chip. I am using it to create a very fast edge for some transmission line modeling evaluations. I am quite cautious so do not turn on the supply until I am sure of what is going on. I have my differential input supply and cannot figure out exactly what to connect to LE & not LE? What is the function of these inputs? In the tables it doesn't seem to make sense as to how to connect these up? I appreciate any information someone can provide. Thanks.