August 2012 Doc ID 022945 Rev 3 1/19
AN4073
Application note
How to improve ADC accuracy when using STM32F2xx,
STM32F40x and STM32F41x microcontrollers
Introduction
The purpose of this application note is to show how to improve the accuracy of A/D
conversions for applications using the STM32F20x / STM32F21x (revZ, revY, revX) and
STM32F40x/STM32F41x (revZ) microcontrollers.
It also explains the firmware methodology, which can be applied to reduce the ADC error. A
reference application is shown with implementation of firmware filtering techniques (using
averaging algorithms) to minimize the ADC errors.
The document also gives some general tips on writing firmware for better ADC accuracy.
Please note that the data provided with this application note is for reference only, measured
in a lab under typical conditions (unless specified otherwise) and not tested in production.
Table 1 lists the microcontrollers concerned by this application note.
Table 1. Applicable products
Type Applicable products
Microcontrollers
STM32F20x / STM32F21x (revZ, revY, revX) and
STM32F40x/STM32F41x (revZ) microcontrollers
www.st.com
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