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ADS1256输入端接信号发生器的差分信号,信号会衰减很大。是阻抗匹配的问题吗

Other Parts Discussed in Thread: ADS1256, DAC1282

信号发生器给出2.5v电压信号,过了rc组成的低通滤波器后,ads1256引脚端电压衰减到1v左右。输入端给基准电源2 .5v就不会有这个问题