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ADC08D1020: Isolating VA and VDR supply pins

Part Number: ADC08D1020
Other Parts Discussed in Thread: ADC08D1520

In the datasheet for ADC08D1020, it is recommended to use a ferrite choke (Miller FB20009-3B) to isolate the Va and Vdr from the 1.9V power supply.

Looking at the reference board for ADC08D1520, no ferrite choke is used.

Is the ferrite choke absolutely necessary for ADC08D1020?

If so, are there any smaller ferrite chokes that can be used?