Transcription of Understanding and minimising ADC conversion errors
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Understanding and minimising ADC conversion errors
AN1636/06031/42AN1636 APPLICATION NOTEUNDERSTANDING AND minimising ADC CONVERSIONERRORSBy Microcontroller Division Applications1 INTRODUCTIONThe purpose of this document is to explain the different ADC errors and the techniques thatapplication developers can use to minimise them. The ADC (Analog to Digital Converter) is animportant peripheral that connects the analog world to the digital world of this application note the ADC embedded in the ST7 microcontroller is used as an example,however the same principles to apply to other 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 theADC and the parameters affecting ADC itself, cannot ensure the accuracy of results, It depends on your overall system de-sign.
nally multiplexed to use same sample and hold circuit and SAR logic. EOC SPEEDADON 0 CH0CH2 CH1 ADCCSR AIN0 AIN1 AINx ANALOG MUX ADCDRH D9 D8 D7 D6 D5 D4 D3 D2 4 DIV 4 fADC fCPU ADCDRL D1 D0 0 1 0 0 00 00 CH3 DIV 2 (a) (b) Sample and Hold circuit (c) Successive Approximation Block (d) (e) VAREF VSSA (f)
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