Thanks for this fast replay. As I was telling, this current leakage is only a concern among others. Our first suspicion is our ADC REF voltage settings wich is 3V-0V=3V > 2V(3V-0V-1V) max from the datasheet. In our case, this hypothesis is much harder to test as the hardware is already made. But it is going to be my next task to test that. For info, here is our schematic (light and intelless for confidential matters) :
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