In STM32U5, What is the right Oversampling Ratio for ADC1 14bit to achieve 16 bit. Is there a formula?

[Shru2]

following is observation with different OR

 

[AScha.3]

you can read about:

https://www.st.com/content/ccc/resource/training/technical/product_training/group1/2a/84/42/de/d3/72/44/87/STM32U5-Analog-ADC-DAC_ADC-DAC/files/STM32U5-Analog-ADC-DAC_ADC-DAC.pdf/_jcr_content/translations/en.STM32U5-Analog-ADC-DAC_ADC-DAC.pdf

https://www.st.com/resource/en/application_note/dm00150423-adc-hardware-oversampling-for-microcontrollers-of-the-stm32-l0-and-l4-series-stmicroelectronics.pdf

 https://ww1.microchip.com/downloads/en/Appnotes/Achieving%20Higher%20ADC%20Resolution%20Using%20Oversampling%2001152A.pdf

https://www.st.com/resource/en/application_note/cd00177113-improving-stm32f1-series-stm32f3-series-and-stm32lx-series-adc-resolution-by-oversampling-stmicroelectronics.pdf

[Imen.D]

Hello @Shru2​ and welcome to the Community 🙂

You will find the formula and more details in the RM0456 section 33.4.31:

  

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Imen

[Piranha]

In short - to gain additional N bits of actual analog performance, one has to oversample by a factor of 2^(2*N) and then right shift the sum by N bits.

Duplicates:

• https://community.st.com/s/question/0D53W000026eq0fSAA/i-am-using-stm32u5-i-want-to-use-16-bit-adc-but-stm32u5-has-only-14-bit-true-adc-with-hardware-oversampling-if-i-oversample-and-increase-2-bits-leading-to-16-bits-will-this-16-bits-be-equivalent-to-true-16-bit-adc
• https://community.st.com/s/question/0D53W00002745xrSAA/i-want-to-get-16-bit-adc-resolution-from-12-bit-adc-using-oversampling-we-can-get-16-bit-by-12-bit-adc-with-oversampling-ratio-osr-of-16-and-also-by-osr-of-256-and-right-by-4-bit-what-is-the-difference-between-this-two