opa454输入为何有电压

供电10V，200K电阻从电源到ED,其它都未接零件，我测试发现输入+，-端都有1.37V的电压，咋回事啊？这电压哪里来的？

因为运放的电源-Vs被悬空。

我接了电源的地，单电源供电

有没有IC内部输入部分的电路图啊

专家？不出声了，以前的回答太水了吧！

不负责任，失望！

Hi Frank,

Thanks for your question.

For OPA454, the maximum E/D to E/D Com Voltage is 5V. It is NOT recommended to connect E/D to V+ through 200Kohms. Besides, it is NOT recommended to float amplifier input even if this amplifer is NOT used.

So please try to adjust your E/D voltage, and ground the input through pull-down resistor (if possible) to check if the circuit is ok? thanks.

Steven