Can this be used as a comparator? and how? Thanks
AD8605
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The AD8605, AD8606, and AD8608 are single, dual, and quad rail-to-rail input and output, single-supply amplifiers. They feature very low offset voltage...
AD8605 on Analog.com
Can this be used as a comparator? and how? Thanks
In a word yes. It's a voltage-feedback op-amp, so it shouldn't be a problem. But there are disadvantages in many op-amps (discussed here) - you'd be better off choosing a device specifically intended for use as a comparator. Unless your needs are very specific indeed.
Thanks