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DAC81404EVM: how to estimate settling time

Part Number: DAC81404EVM

I am using 81404 Eva board to provide voltage (0 -18v) supply to my optical sensor.

I wonder how to estimate settling time.  Based on its data sheet

At 20v span, the typical value is 12us. However, what I got is much longer than that about 500us as showed in the picture below

Can anyone explain why? How can I reduce it?