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ADS8686S: ADS8686S输入低通滤波问题

Part Number: ADS8686S

ADS8686输入 RC 低通滤波器,R的取值有范围吗?如果过大会引起增益误差吗?PGA的增益是不是跟REF 1MΩ有关?如图中的R为3K,我如果选择十几k的电阻会不会有问题?