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?