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AD7768 channel to channel phase delay issue

Question asked by Jackey.HHuang on Jul 4, 2016
Latest reply on Jul 6, 2016 by NiallM

Hi, Sir:

I used 2 AD7768 to get voltage and current signal.

First one is to get voltage signal and another to get current signal.

I used ARM to give start pulse to first AD7768, and fitst AD7768 SYNC OUT signal  is to connect first AD7768 SYNC IN and another AD7768 SYNC IN because of getting the data at the same time.

After testing, I found a serious issue is that every channels trigger timing is different for each time re-power.

I cannot be calibration because trigger timing is different(100nS probably) after re-power.

I want to check this issue is ADC characteristic or not, thanks.