In the datasheet @ AD5290, "Digital Input and Output Voltages to GND" @ Absolute Maximum Ratings is "0 V, +7 V".
What does it means ?
0.0 V to + 7.0 V @ LOGIC pins input, Absolute Maximum Ratings ?
− voltage (−0.3 V) is not available ? For example, about -25mV undershoot input.
In general, Following is descibed @ other DigiPOT+ .
−0.3 V to VLOGIC + 0.3 V
But in the AD5290, VLOGIC supply pin is none.