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OPA2277单端转差分电路时,反相端输出不对

Other Parts Discussed in Thread: OPA227, OPA2277

单端转差分时OUTA+与OUTA-电压不是反相,而是相等,换成LT1112就正常了.求大神解答下原因,谢谢!

例如单端输入电压为5V,正确应该是OUTA+ = +5V,OUTA- = -5V,但是实际输出的却是OUTA+ = +5V,OUTA- = +5V;