I'll design a 2.5V power supply for the reference of AD7714. My spec is REF IN(+): 2.5V, REF IN(-): 0V and Ta=-5 degC~+50 degC.
Could you tell me a current rating of the REF IN(+)? 1mA is enough?
Yes, I think the current is around some uA level only. This thread may be able to help you regarding the actual measurement. https://ez.analog.com/message/114854?commentID=114854#comment-114854
We also have some recommended voltage reference parts for AD7714 that you may want to consider.
For precision 2.5V applications with AVdd = 5V: AD780, REF43, REF192.
For precision 1.2V applications with AVdd = 3V: AD589, AD1580, ADR512.