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..
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.
Marek LisSr Application EngineerPrecision Analog - TI Tucson
In reply to Marek Lis:
Thank you Marek,
Attachment is really very useful for my application...
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.