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RS485采用TI的ISO3080，根据TI的参考设计文档SLLA299，准备用其 Figure 2. 2-kV, Isolated RS-485 node for 1-Mbps, Full-Duplex Operation
但查不到图中的以下元件参数：
RF1、CF1；
RF2、CF2两组。
可以认为RF 与 CF组成的低通滤波器，其可以阻止高频干扰并可以改善EMI特性。截止频率可以按照最大通信速率的一半的10倍来设计；截止频率确定后可以确定RC参数。
