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ADS1298: 求助

Part Number: ADS1298

我的ADS1298在正常电极模式下,信号发生器给不给输入得到的值都如下图监测到的所示:

只开启了第7通道,输入不接信号发生器时也是差不多的这个值

我使用内部方波测试信号的时候,方波高电平时的电压换算值也与此值相近,但确实是产生了方波

请问是哪里出问题了

电路原理图附上:

模拟输入:

ADS1298: