STM32H7 ADC performance - ya gotta read the fine print!

[thm_w]

We had checked all the analog voltages - VDDA (Pin-40), VREF+ (Pin-39) & VSSA (Pin-38) and ferrite beads. All these voltages were ok.
Later when we replaced the MCU in two boards, all the ADCs are working fine in these two boards.

This question deserves its own thread, but anyway.
Have you checked the voltage sequencing of Vdda/vref/etc using an oscilloscope?

[eutectique]

We are facing some issue in ADC1 & ADC2 which are getting failed in few boards.

Have you seen this article: https://jpieper.com/2022/08/05/debugging-bare-metal-stm32-from-the-seventh-level-of-hell/ ?

It might not be directly applicable to your case, but still is a warning call about STM's undocumented features.

[pravardhan]

This question deserves its own thread, but anyway.
Have you checked the voltage sequencing of Vdda/vref/etc using an oscilloscope?

I have not checked these 2 voltages pins on the oscilloscope for the sequencing as the same +3.3V is being fed to Vdda, Vref & Vdd pins.