Tool/software:
Dears,
The internal ADC of F28388D has a REF reference level. I found that on the demo board, the ground of this ADC-REF is the same as the digital ground DGND, without distinction.
I am currently using DGND specifically as the ground for F28388D power supply, and there is a dedicated AGND analog ground for the ADC, as well as the ground for external operational amplifiers (proportional amplifiers or emitter follower operational amplifiers). The internal ADC of F28388D has several ground pins, and I have provided an SGND for it.
I short circuited the SGND and AGND planes together at a single point on the reference power supply REF5030 used for VREF.
I short circuited AGND and DGND planes together at a single point at the input power ground.
Common ground through a 0 Ω resistor.
So I saw that your demo board has no ground plane, only one DGND plane, which I find a bit strange, so I asked you.