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运算放大器功耗大

Other Parts Discussed in Thread: OPA4188

我在调试4路通道的放大器时,使用的是AD620和opa4188  这两个运算放大器的芯片功耗都很低,可是在实际使用的过程中,功耗远远大于数据手册上的。但是电路是正常工作的。而且在不接输入信号的时候,功耗在100mA,接了输入信号功耗反而降低50mA ,请问这个是什么问题啊?