I have question about AD7793 evaluation board .
Ain(+)= Ain(-)± 150mV (1mV-step)
linearity is ok.
Usual data step is 13356/mV
But -66mV to -67mV and 66mV to 67mV
data step is 13135/mV.(non-linearity point)
Usual data step is 26807/mV
But -32mV to -33mV and 32mV to 33mV
data step is 26500/mV.(non-linearity point)
Usual data step is 53633/mV
But -15mV to -16mV and 15mV to 16mV
data step is 53296/mV.(non-linearity point)
Gain =4, 8, 16 have non-linearity point .
The bigger gain value is ,the smaller non-linearity voltage.
Are there any special characteristics about In-Amp or other in non-linearity point ?