Transcription of Understanding and minimising ADC conversion errors
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Understanding and minimising ADC conversion errors
AN1636. APPLICATION NOTE. Understanding AND minimising ADC conversion . errors . By Microcontroller Division Applications 1 INTRODUCTION. The purpose of this document is to explain the different ADC errors and the techniques that application developers can use to minimise them. The ADC ( analog to Digital Converter) is an important peripheral that connects the analog world to the digital world of microcontrollers. In this application note the ADC embedded in the ST7 microcontroller is used as an example, however the same principles to apply to other ADCs. The accuracy of analog to digital conversion has an impact on overall system quality and effi- ciency. To be able to improve accuracy you need to understand the errors associated with the ADC and the parameters affecting them. The ADC itself, cannot ensure the accuracy of results, It depends on your overall system de- sign. For this reason, you need to do some careful preparation before starting your develop- ment.
sive approximation method is the most popular technique. It is also known as Successive ap-proximation Register (SAR) technique. This technique uses binary search method. It consists of a high speed comparator, DAC (digital to analog converter), and control logic. Refer to Figure 1. Figure 1. Successive Approximation Block Diagram
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