Insights on STM32 internal ADC accuracy-EEWORLD

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According to the technical manual provided by ST, the ADC parameters of STM32F103 are quite excellent, with a sampling rate of up to 1MHz, 12Bit, and various errors are also lower than those of mid- and low-end dedicated ADC chips.

However, in actual use, it is quite different from what is described in the document, because the developed product has high requirements for accuracy and does not consider cost factors. Therefore, the PCB has fully considered various factors that affect accuracy, and adopted single-point grounding of digital and analog ground, multi-layer board design, ground integrity, AVCC separate power supply, and high-precision AD company reference source to provide VREF voltage. When enabling DMA to collect data, it is found that although the overall error value of the data is very small, which is completely comparable to most dedicated ADCs, one or two numerical errors will appear from time to time, even up to +-8LSB or more. There is no interference source on the board, and even directly connecting the ADCIN pin on the STM32 to the AGND pin, it is still inevitable that some large errors will appear from time to time. This error should be caused by the STM32.

Considering the high acquisition rate of the internal ADC of STM32, after using a simple algorithm to filter out the values with large errors, it is found that the accuracy is still very high, and it can completely replace some 12-bit, dedicated ADC chips within 200kS.

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