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手册写的是推挽结构，为什么参考线路里面作为输入使用时都需要上拉？那作为输出时需要上拉电阻吗？
您好，
与下面链接问题重复：
https://e2echina.ti.com/support/interface/f/interface-forum/723517/tca9534a-p
