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How to use external reference voltage for ADC (Nucleo-H723ZG)

sreyas40
Associate III

‎2025-09-24 12:19 AM

I want to provide external reference voltage to 16-bit ADC.

sreyas40_0-1758697683463.png

So i need to remove the  R36.

sreyas40_1-1758697754486.png

And Vref is connected to Vref+ pin on the board.

These two things are the only steps i need to do right, after that i have to connect my external source to the vref+ pin and it will be the reference voltage for my ADC. 

sreyas40_3-1758698218843.png

And i need to make sure Vref<= Vdda, small increase might not be an issue right?  Are there anything else i need to look into

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LCE
Principal II

‎2025-09-24 4:28 AM

Looks okay at first glance.

> small increase might not be an issue right

Read the datasheet...

The problem with this on a Nucleo board might be, that (probably, not sure) the external VREF's capacitor is far away from the VREF pin.

The supply voltage isn't too bad / noisy, so depending on the routing of the VREF at the connector and where its cap is placed, it might make things worse.

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