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AD9237 VREF voltage range

In the datasheet of AD9237, Table7 descibes reference configurations.

when I use programmable reference configuration or external reference, what is the allowable voltage range of VREF?

In External Reference Operation section of the datasheet, I found the following explanation.

Why is the external reference voltage is limited to 1V?

"The input span is always four times the value of the reference voltage divided by the span factor;

therefore, the external reference must be limited to a maximum of 1 V."