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ADE7758 Noise immunity in zero-crossing detection

Category: Datasheet/Specs
Product Number: ADE7758

Hello,

I was using the ADE7758 and waiting for a flag to be set after stopping the current supply to detect a zero-crossing timeout, but it didn't appear.
Looking at the waveform, it doesn't become flat, and there seems to be noise on the line.
I suspect that depending on the noise level, frequent zero-crossings might occur.
Since this is not mentioned in the datasheet, I cannot determine if my assumption is correct.
What is the noise immunity level, or what is the hysteresis level?

Best regards