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ADS1282的THD问题

Other Parts Discussed in Thread: ADS1282

您好,请教ADS1282的THD问题。我用ADS1282EVM-PDK外接信号发生器测得THD只有-76.65,用同一个源和以前我做的一个24位AD芯片的电路板测试,能达到

-84.96dB.我想请问,在同样输入条件下,为什么ADS1282的THD要低?或者我哪里的设置或链接问题会造成这样的现象?datasheet中-122dB是在什么条件下得到的??