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ADS1118 Delta-sigma 一类的ADC输入端的RC滤波器器参数如何计算,有spice模型吗

Other Parts Discussed in Thread: ADS1118

最近在使用ADS1118,想要在ADC的输入端加一个跟随器以减小输入阻抗,再在二者之间加入一个RC滤波器,滤波器的参数不知道如何计算?请问有相关资料吗?(SAR一类的ADC到是很多)。本来想用Tina仿真,结果没有spice模型。请问有模型吗