AD7091R-2,-4 External Ref Input Range

HI,,

 

I have a question , AD7091R-2,-4 External Reference Input range.

There is 1.0 - Vdd V in Page 3 , at dataseat

But , there is 2.5 - Vdd in Page 18 , at dataseat.

 

I think external reference input range is 1.0 - Vdd .

Which is correct?

 

AD7091R-2 Dataseat

 

Best regards