AN4073 datasheet(25/32 Pages) STMICROELECTRONICS

Part #	AN4073

Description	How to improve ADC accuracy when using STM32F2xx and STM32F4xx microcontrollers

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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25 / 32 page

DocID022945 Rev 5

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AN4073

STM32F4 ADC accuracy options

4.3

Measurement conclusions

Based on these measurements and comparing to STM32F2xx and STM32F405/F415/F407/

F417 measurements, we can conclude that ADC accuracy options embedded on these

products allow an improvement of the ADC code dispersion up to 75 %.

For the applicable products, you can choose either to work with the default configuration or

to enable one of the options; It depends on the ADC precision required by the application.

Based on these typical measurements, to achieve the best ADC accuracy with these

products, you need to know that:



For the Default configuration: Prefetch OFF + Data cache ON + Instruction cache ON

gives a maximum of 8 codes of dispersion.



When activating Option 1: Prefetch OFF + Data cache ON + Instruction cache ON

gives a maximum of 6 codes of dispersion.



When activating Option 2: Prefetch ON + Data cache ON + Instruction cache ON gives

a maximum of 6 codes of dispersion.

However, Options 1 and 2 should only be applied in specific conditions as detailed above

(refer to Section 4.1) to avoid any MCU malfunction.

AN4073 Datasheet(PDF) 25 Page - STMicroelectronics