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?
The REFIO pin is an input or output, so it can be driven with an external reference. What is your reason for driving it externally?
The AD9783 can operate with either internal or external reference applied to the chip to override the internal reference. However most applications use the internal reference.
Hello Clarence, MicheleV,
Thank you for your prompt support.
This question is from our customer and I informed your answer to him soon.
He is going to consider what vref level is suitable for his application.(It's a reason to use external reference)
And he wants to know the valid range for external reference.
Could you tell the valid range for REFIO to me ?