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Hello Robert,
The total reference input current when operating with a 32MHz clock is 10.5mA. This is a combination of an equivalent 400ohm DC load, as well as an additional switched-capacitor load. In order to get datasheet performance from the ADC, you will need to include a reference buffer placed as close as possible to each ADS1675 in your system. I suggest using the OPA211 circuit for each ADS1675 with a single REF5030, as shown in Figure 53 of the datasheet.
Regards,
Keith Nicholas
Precision ADC Applications