I have a question about the function of REFIO of AD7983.
In the pin descrition tabe, Table 8, REFIO pin is described as "Analog Reference Input/Output (1.2 V Nominal)."
This description include "Input", but I think that the AD7983 is not able to use with external reference.
The block diagram of reference circuit is indicated in page of 28 of datasheet, I think the AD7983 can be operated with internal reference.
Is this understanding correct?