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关于tm4c123的adc采样精度

Other Parts Discussed in Thread: TM4C123GH6PM

tm4c123的数据手册上给出adc的offset error和gain error都挺大的,最大值为±30lsb,这两个参数为什么会这么大?和vdda和gnda的使用与设计有关吗?