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About voltage reference of AD9236

I'm designing a DAQ system with AD9236, and with 1V reference voltage. It seems it has internal reference, the data sheet only specified the typical and max error at 25 ℃, and apparently this is not the situation when the AD is running at full speed.  So, I think I may need go for external voltage references.

Can someone give some suggestions/recommendation on choosing and using a external reference chip?