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您好,
您是怎样确定“差分输入电压不变”的,是否通过示波器实际测量了信号上面没有纹波?同时,基准电压是否稳定?因为输入电压和基准电压将直接影响AD转换结果,因此请先看看它们是否稳定?
另外,供电电压的稳定性也会对输出造成影响,也请确认供电电压的纹波和稳定性。
建议您先短接ADC输入,以排除输入和参考噪声源的原因,看采集数据怎样?是否符合预期