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ADS5287: External reference and switching current

Part Number: ADS5287

Two questions regarding this note in the datasheet (Applications Information -> Reference Circuit):

"The external reference driving circuit should be designed to provide the required switching current for the eight ADCs inside the chip."

1. Is there a bandwidth requirement imposed on this switching current? (based on maybe sample rate or signal BW)

2. There is no min/max spec. for switching current, only a typ. Any advice on margin/overhead?