Hi,All
I found out some my questions by myself.
The answer for no.1 question
⇒
The settable voltage of external Vref is only 2.5[V] and 4.0[V].
The answer for no.2 question
⇒
Input-Referred noise emanate from Amp and Low Pass Filter.
And input-referred noise doesn't mean digital output noise.
If my answer is wrong,please advise me.
I can't find out questions for No.3 and No.4 yet.
Please teach me answers for No.3 and No.4.
Best Regards.