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《Performance Demonstration Kit for the ADS131E08》文档中原理图的外部参考电压使用OPA350是为因为VREFP输入阻抗为6K，避免低阻抗产生的电压误差？OPA350输入±端之间的电阻R54是为了什么设计？
Performance Demonstration Kit for the ADS131E08-评估板.pdf
OPA350在这里起到了一个driver buffer的作用。
R54 作为输入源的端接电阻，可不接。
