50hz AC 20mV pk-pk to Square wave (Zero Crossing Detector) using OPA379 single supply opamp

I am using OPA379 Single supply ultra low power opamp for SIne to Square wave converter...(ZERO CROSSING DETECTOR)

Input is 20mV pk-pk AC Sine wave from Current Transformer..

Supply voltage is 3.6V battery...

I want to design precision Zero crossing Detector using OPA379 opamp..

Can any body suggest me any Design Technique..