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How to check voltage amplitude and frequency? RMS to DC?

Question asked by eduardobuezas on Apr 11, 2014
Latest reply on Apr 17, 2014 by Encoder1

Dear Colleagues: I'm trying to check a 380 volt amplitude and frequency with an MC9S08QG8. My initial idea is to compose a RMS to DC circuit and then send the DC to the microcontroller. The fact is that I couldn't find in my market the AD637 or any similar IC. Do you know which circuit may I use instead of or replacing this IC, or if there is another idea instead of RMS to DC? Any other had this inquiry before? Thanks in advance. Regards. Eduardo

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