Hi, Richard:
One more question below.
Currently our ADS5407 is working in default setting, that the Auto-Correction is disabled, with which, the Offset Error range, according to the data sheet on page 7, is between -20mV ~ +20mV.
My question is, for a same channel (there are two channels per package), in one running ( after power on and before power off), its Offset is fixed, or is variable dependent on other factors?
Based on our testing, in which we tried different input voltage values ( not exceed range of 1.9V+0.25, 1.9V-0.25V), it seems the Offset Error is not a fixed value ( We compared two values, one is input differential analog voltage measured by multi-meter, another is ADC's digital output).
I attached a pdf file that is a curve from actual measuring.
Thanks.