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如何对差分信号进行有源滤波和数字隔离?

Other Parts Discussed in Thread: PGA281, THS4551

各位前辈,最近遇到一个数据采集的问题:1、首先采用PGA281可编程运放对小信号进行放大,但由于PGA281输出的是差分信号,因此如何对差分信号进行有源滤波呢?难道要在+、-两路上分别滤波吗?2、采集部分AD与FPGA之间的通信接口也是差分信号,参考TI数据采集解决方案,准备将AD与FPGA之间的差分通信线也进行隔离,现在就是没找到隔离差分信号的器件,难道要将差分信号单端化后在隔离?