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急急急!!!求问OPA129UB芯片保护环问题!!!!

在运用opa129做光接收的前置放大器的,PCB布局如图所示,

把1,4,8连在一起,但8脚一接地就会芯片发烫,而且经测量,1,4,8三个引脚的电压为-11.3V,(芯片电源电压为±12V)这是怎么回事?????