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Isolated high AC voltage measurement + zero crossing detection

Prodigy 585 points

Replies: 1

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1) a customer is searching for a solution for isolated high AC voltage measurement.

- for 180-770VAC/50-60 Hz, accuracy of +-0.25% needed

Which isolated amplifier would be the best fit for this? Is there any ref design / literature for this?

2) they also need zero crossing detection with <100us delay. Positive zero crossing -> negative  flank, negative zero crossing -> positive flank

I have seen ADS7x28 with zero crossing detection module mentioned in sbaa356.

Could this work in combination with an isolated amplifier?