AD7293 Vrefout issue

Hi, I have an AD7293 with Vrefin connected to Vrefout. There is nothing else connected to these pins, except a capacitor. Vdd is at 5V. I have 3.1V on Vrefout. On Vrefad there are 0.56V.

In the AD7293 pdf, there is the following: Vrefin internally connected to Vrefout, Vrefad is half of Vrefout.

On Vrefout, there should be 2.5V instead of 3.1V.

Anyone knows the cause of this?

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