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关于REF102的应用问题?

Other Parts Discussed in Thread: REF102

应用在精密电流源中的推荐原理图中,REF102的第四脚直接连接OPA运放的输出脚,我的问题是——REF的这个第四脚和接地没有关系吗?或者说,在这个应用中,第四脚就是不能作为“地”来使用?