AD5683 VREF Decoupling


Hello !

I am using an external reference for the AD5683. The Datasheet in not clear for the VREF Pin as input.

First of all, the VREF Pin is only marked as output Pin for the LFCSP package and the Pin description is only for the "R" types. In this case it is marked as decouple with 10nF Cap to GND.

Same information for the MSOP package.

Now on page 26 it says "Ensure that the .... have ample supply bypassing of 10uF, in parallel with 0.1uF capacitor"....

Since VREF is used as supply in this case, do i need more than the 10nF capacitor on the input pin VREF?

Greetings

  • 0
    •  Analog Employees 
    on Aug 21, 2016 9:44 PM over 4 years ago

    Hi,

    Apologies for the delayed response. Thank you for pointing that out. We will include this errata to our next data sheet revision.

    Additional capacitor should not be needed. When the VREF pin is set as an output pin, the VREF pin would act as a reference. The part's VREF pin is designed to be a reference and not a supply. If you are going to source a lot of current than what the part can source, then the VREF pin will not work as intended.

    Regards,

    Mark