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ads1675开发板采集的频谱指标很差,请问是哪里的设置有问题吗



上图是采集的波形,指标和手册给出的差距很大,不知道是哪里的设置不对,开发板的电压供的是5V、9V和-4V,数字电源没有单独供电,这也不会对指标影响有那么大吧