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CC2541 ADC 誤差

Other Parts Discussed in Thread: CC2541

我手上有一片板子是Tiwi-ub1
模組裡面的MCU查到好像是CC2541
板子使用power support 供應3.v
參考電壓選擇Internal Reference Voltage 1.24v
ADC的電壓轉換卻是3.1v
誤差0.1v....想請問一下是ADC本身的誤差嗎...
誤差0.1%?