AN2834 datasheet(1/45 Pages) STMICROELECTRONICS

Part #	AN2834

Description	How to get the best ADC accuracy in STM32Fx Series and STM32L1 Series devices

PDF	45 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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September 2013

DocID15067 Rev 2

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AN2834

Application note

How to get the best ADC accuracy in STM32Fx Series and

STM32L1 Series devices

Introduction

The STM32Fx Series and STM32L1 Series microcontroller families embed up to four

advanced 12-bit ADCs (depending on the device). A self-calibration feature is provided to

enhance ADC accuracy versus environmental condition changes.

In applications involving analog-to-digital conversion, ADC accuracy has an impact on the

overall system quality and efficiency. To improve this accuracy, you need to understand the

errors associated with the ADC and the parameters affecting them.

ADC accuracy does not depend on ADC performance and features alone, it depends on the

overall application design around the ADC.

This application note aims to help understanding of ADC errors and how to enhance ADC

accuracy. It is divided into three main parts:

 a simplified description of ADC internal structure to aid understanding of ADC operation

and related ADC parameters

 explanations of the different types and sources of ADC errors related to the ADC design

and to external ADC parameters such as the external hardware design

 recommendations on how to minimize these errors, focusing on hardware and software

methods

This document applies to the products listed in Table 1 which are referred to as STM32x

throughout this document.

Table 1. Applicable products

Product family

Part numbers

Microcontrollers

– STM32F0xx

– STM32F1xx

– STM32F2xx

– STM32F3xx

– STM32F4xx

– STM32L1xx

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