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i found the adc of stm32f103ret6 is nonlinearity

Question asked by eason.lee on May 29, 2014
Latest reply on Jun 3, 2014 by eason.lee
hi,
i am using stm32f103ret6 to test the voltage from the signal genarator(DG1022 from rigol).
i found the adc of stm32 is nonlinearity.
i found that,when the voltage from DG1022 is less than 1V,the voltage get from adc of stm32 is smaller the 1V,but the volmeter's result is acurrate. Next is the result:
DG1022 (mv)       adc of stm32
3000                    3000.352
2000                    2000.654
1000                    996.415
500                      495.2234
250                     246.88
150                     146.877
60                       57.627
30                       27.982
10                       8.219

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