Could you check attached information?
I think that 75ms REF settling turn-on is wrong behavior, different from datasheet spec 5ms.
What is wrong? circuit, operation or my understanding?
I would just like to clarify what reference you are using. In the pdf file you attached there's a comment saying "select Internal Ref" but the config you stated has bits [5:3] as 111, which from the configuration table selects "External reference, internal buffer, temperature disabled."
Thank you for correcting. You are right.
It intended to select external reference and internal buffer.
Ok. So the settling time of 5ms is for the internal reference only. You should check the datasheet of the external reference you are using if the settling time matches what you are seeing.
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