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High-Speed DACs

Q&A AD9783: the function of REFIO

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AD9783: the function of REFIO

y_suzuki on Aug 28, 2017

Hello ,

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?

Best regards,

ysuzuki

0 ADIApproved

on Aug 28, 2017 10:35 PM
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?
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0 MicheleV

on Aug 29, 2017 12:10 AM
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.
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0 y_suzuki on Aug 29, 2017 8:10 AM

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 ?

Best regards,

ysuzuki
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