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从ADS7142的Datasheet来看，应该是一个16位的高精度AD，但参考的基准电压却是用的电源，那么如果保证其高精度呢？因为常用的LDO的精度普遍大于1%且存在温漂，可如果用基准供电如REF50xx，其成本又增加不少，这样是不是有点尴尬啊。
