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LMP91200能否用信号源进行调试

Other Parts Discussed in Thread: LMP91200

我看到LMP91200 datasheet里说PH值电极的输出范围是正负415mv,我就想用信号源输出mv级(正负415mv之间,比如100mv,200mv之类)直流信号,LMP91200选择差分输出,结果发现连续几次测量,数值跳动比较大,进行了多次采样平均,数值依旧跳动比较大。我想问,是不是不能用信号源模拟PH电极直接调试这个芯片?麻烦解释一下,谢谢!