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AD7324 Power Supply Sequencing

Question asked by ashraf on Oct 27, 2014
Latest reply on Oct 27, 2014 by KarenNE

Hi,

 

I am using the ADC (AD7324) in my design. I am providing +/-12V, 5V for the Core, and 3.3V for Digital.  I am using LDO's for all supplies, adequate decoupling, but all supplies are coming online simultaneously.

I am seeing this issue where sometimes, the negative supply current is much higher than expected, the positive supply is much lower than expected and the part is unresponsive (locked up).

Is there a prefered order for the supplies to come on (Digital, analog, then references?). I was not able to see timing requirements in the datasheet. Am I missing something?

 

Thanks,

Ashraf

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