求教：
1、看了LOG114的数据手册，里面单电源供电方案中，I1端4V的基准源接1.62M电阻，为何是1uA的电流呢？
2、根据LOG114数据手册上面提供的单电源供电方案设计PCB板，实际测试时候发现一个奇怪问题：上电后，还没有输入电流时，输入端I2就会有2.5V的电压输出，请指教！
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