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OPA860: 仿真结果和实际结果的区别

Part Number: OPA860

opa860芯片连接+-5v供电后测量输出引脚(pin8,c端)的输出的电压为227mv,仿真只是连接了供电端如下图,因为测试所以是这样链接。购买的芯片也这样链接后测试的脚显示结果为2v,请问是不是芯片是不对的