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SDADC problem in single-ended mode.

Question asked by tx.txmsszd on Sep 4, 2016
Latest reply on Sep 7, 2016 by tx.txmsszd

I meet a problem with my project in which a STM32F373 MCU is used to collect singnal in single-ended mode.I short the pin with GND to test the board,the ADC values I get seems to fluctuate like saw-tooth.SDADC_S.jpg
The graph above shows what I get with my board.The signal is moving averaged.
But if I chang SDADC module into differential mode,the saw-tooth liked pattern disappears.
The single passes through a RC network before it arrives at the SDADC pin.

Has anyone encountered such a prolem?