我用LMP91200搭建电路测试PH值,如果配置Configuration register的D7,配置为接地GND(单端输入方式测量),能够测量不同的PH值。但是如果配置D7为VOCM(差动方式测量),则读取的AD值跳动很大,请问这是为什么?能不能用差动方式测量?
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