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AD9481 - Vref Capacitance

Category: Hardware
Product Number: AD9481

The AD9481 datasheet mentions that a 10 uF bulk capacitor is required on the VREF pin when the internal fixed reference is used. It doesn't say what the maximum ESR for this capacitor should be. Is there a recommendation on how high the ESR can be for this capacitance?

Also, would there be any significant downsides to using a lower capacitance like 6.8 uF of 4.7 uF for this bulk capacitance? Which, if any, datasheet specs would be impacted by this?