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各位专家，我最近买了ADS1148评估套件ADS1148EVM-PDK，用电位差计输入一路差分信号测试效果，发现上位机的ad结果是方波，这是为什么？现象见附件的图片。
20mV 的纹波, 可能来源于噪声, 干扰或者地线连接里的杂波
用电位差计输入的差分信号是否满足ADS1148的要求呢？
