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ADS1146读取的值不稳定..

Other Parts Discussed in Thread: ADS1146, ADS1246, ADS1255

我现在用到ADS1146,0-100mv单端输入,AD的Ref为2.04V,AD1146用内部晶振,MCU为1Mhz,读取的值变化很大不稳定,请问是什么原因?谢谢!