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FSR指的是full scale range，即VINP-VINN。 比如一个-5～5V的输入信号，那么maximum linearity error 可以计算：
+-0.018%*10V=+-1.8mV。
而对于ADS8326 来说，datasheet有给出For a reference voltage of 2.5V,，the value of the LSB is 38.15μV, and for a reference voltage of 5V, the LSB is 76.3μV. 这样的话，将其带入 linearity error 即可计算出典型或者最大值，从而判断二者哪一款的精度更好
