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您好,
选低通滤波器还是带通滤波器取决于有用信号频率与噪声频率的关系,滤波器是将无用的噪声频率信号滤除而保留有用信号频率。ADS1256一般采用数据手册 Figure 25 的RC 滤波器。
对于24bitADC滤波器的衰减应该达到多少dB?
这个与设计需求对采集信号的精度要求有关。