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TI Home » TI E2E Community » Support Forums » Amplifiers » Precision Amplifiers » Precision Amplifiers Forum » 50hz AC 20mV pk-pk to Square wave (Zero Crossing Detector) using OPA379 single supply opamp
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50hz AC 20mV pk-pk to Square wave (Zero Crossing Detector) using OPA379 single supply opamp

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

This question is answered
ravi patel
Posted by ravi patel
on Apr 23 2012 04:27 AM
Prodigy160 points

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..

OPA379 Zero crossing Detector
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  • Marek Lis
    Posted by Marek Lis
    on Apr 24 2012 17:32 PM
    Verified Answer
    Verified by ravi patel
    Genius13880 points
    Zero Crossing detection Methods.pdf

    Ravi,

    Op amps are NOT best suited to be used for zero-crossing detector due to its relatively low slew rate and long overload recovery time (output coming out of rail).

    In the case of OPA379, not only the typical slew rate is just 0.03V/us but more importantly the typical overload recovery time is 25us greatly limiting the maximum detection speed - see below.

    It would be much better in your application to use one of the our comparators like micro-power LPV7215 with IQ of less than 1uA and the speed much greater than any op amps with similar quiescent current may ever be - see attached.

    Regards,

    Marek Lis
    Sr Application Engineer
    Precision Analog - Burr-Brown Products
    Texas Instruments - Tucson

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  • ravi patel
    Posted by ravi patel
    on Apr 24 2012 21:06 PM
    Prodigy160 points

    Thank you Marek,  

    Attachment is really very useful for my application...

    Thanks again...

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