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以28335为例,其内部基准电压为ADCREFP-ADCREFM=1V,外部基准可选1.024V,2.048V;然而实际输入的有效范围为0~3V,但从我了解的AD转换器以及原理来看,通常输入电压都小于参考电压,但是此AD并非这样,想了解下此AD内部怎么处理的。请各位不吝赐教,谢谢!