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DP83848IVV芯片引脚RBIAS（24脚）说明为：Bias Resistor Connection. A 4.87 kΩ 1% resistor should be connected from RBIAS to GND. 请问这个引脚接偏执电阻的作用是什么？如果所接电阻阻值不同或精度不够会对使用产生什么样的影响？
