as page 15 of data sheet mention, EPAD should need to connect to AVss pins or left unconnected.
If I connect to GND plane, is it any risk to damage component?
Why does it needed to connect to AVss pin any special function for EPAD?
In the AD5755 the exposed paddle (EPAD) is internally connected to AVSS so I recommend either connecting to AVSS or leave floating.
The benefit of connecting to AVSS is to enhance the thermal performance of the device.
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