Nucleo-H753ZI board Connect ADC inputs to GND, the readings are varied between -15 - +15

[RongShengWang]

Nucleo-H753ZI board. ADC1 configurations: INPUT: SINGLE-END

Sample clock rate = 5Mhz

Sample rate = 10Khz,

Sample Time = 16.5 cycles,

Resolution = 12-bit

Scan 256 times

Connect the defined two ADC input channels to GND.

The 256 readings FOR EACH INPUT are varied between (-15 - +15), more or less, while they should be read as zeros.

Question: Can it be fixed How to fix it?

Could you do the same test to confirm it?

Thanks,

Rong

[RongShengWang]

The problem was due to the longer wiring on the Eva board. After shortened the wires, the data read out is between

0-2 now. Nothing else was wrong.

Case closed.

[Karl Yamashita]

I have the NUCLEO-H755 and I get between 0-2 with oversampling. Without oversampling, I get value between 0-4.

[RongShengWang]

The problem was due to the longer wiring on the Eva board. After shortened the wires, the data read out is between

0-2 now without oversampling,. Nothing else was wrong.

Case closed.