Unexpected Gain in OPAMP_PGA in G431

[HDaji.1]

I am testing Examples/OPAMP/OPAMP_PGA/ in G4 package code, only to find the gain is not consistent as showed below:

The OPAMP input values are 0.01,0.03, ..., 0.15, and gain is 16.

However, I measured output at ADC side, the gain drops significant as input values increase.

What went wrong?

[Igor Cesko]

Hi HDaji.1 ,

Calibration procedure is described in reference manual RM0440 (25.3.7 Calibration).

Regards

Igor