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使用NE5532搭建电压跟随器的问题

Other Parts Discussed in Thread: NE5532

TI工程师你好,

我用ne5532搭建了一个最简单的电压跟随器。供电是单电源5V。如上图,sip-2是输入端,会接一个ntc电阻进行温度采集。输出端直接接stm32的ADC

但是当sip-2空着不插的时候,输出端测试电压为1.27V。此时输入端的电压测试为0.33V。请问这是为什么呢?哪里不对吗