It is a question about noise in AD7124 Evaluation board.
After doing a noise evaluation, I'm in trouble in that noise specifications are not according to data sheet.
I have two question.
#1 When I perform a noise evaluation in Sinc4 Filter, the value that was gretly different from Date sheet may sometimes
It sometimes succeed or sometimes fail.
Why will such a difference appear?
#2 I performed a noise evaluation by two kinds of methods. One , I let "LK5" short-circuit, the other I let "LK5"
short-circuit and connected AIN0 and AIN1 to the ground(figure 2).
When I connect to the ground, the value that was better than a data sheet was provided.
Which method is right?