Unable to feed external voltage reference to DAC

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I am using pot meter to feed the external voltage reference to DAC present in NUCLEO-L496ZG, but DAC output pin shows no response (PA4).I can get output to internal reference. I tried changing vrefbuf mode to external voltage reference & vrefbuf off condition too. but dac doesnt produce output
Note: i am feeding pot meter's output to the vref+ pin to provide external voltage reference value

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mƎALLEmBest answer

ST Technical Moderator

Hello @akash07 and welcome to the community,

First you need to tell more about that "pot meter"? do you mean potentiometer? in that case why are you using a such kind of source? try another source like a regulated power supply.

Second, did you remove SB149 to disconnect it from AVDD?:

Did you solder SB119 (opened by default) that connects VREF from the zio connector?:

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Andrew Neil

Super User

Show your code & your schematic:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.