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急求!!!OPA1641 漏电流/输入失调电压问题

Other Parts Discussed in Thread: OPA1641

使用OPA1641,IN-脚(2号脚)与PCB之间悬空,IN+(3号脚)通过接模拟地,负反馈跨接50M电阻,输入信号为PA级,测试带屏蔽。在调试过程中发现2号脚和3号脚很容易出现0.8V左右的电压,经反馈电阻后再输出端达到2.7V左右电压,请问运放在那些异常操作情况下容易出现输入电压不为零的问题?//