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放大器引脚悬空电压值问题、

Other Parts Discussed in Thread: OPA690
尊敬的专家您好:
我用贵公司的放大器OPA690实现一个负电阻电路,电路图如下图所示,当不加输入电压,只加正负5V的供电电压时,发现放大器的正向输入端和输出端的电压均为3.56V。反向输入端的电压为1.87V  但是当我把原理图中的反馈电阻R5用一个100Ω可变电阻(电位器TSM4W101)代替,也是不加输入电压,只加供电电压,发现放大器的正向输入端和输出端的电压均为-3.56V。反向输入端的的电压为-1.87V。为什么会出现端口电压相反,3.56V就是放大器的饱和电压吗?