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AH101中功率高线性放大器

各位技术人员,请问有用过AH101芯片吗?我手头有4块AH101,但我用万用表测试的时候,4块芯片都是3引脚和2引脚内部相连。

按照应用电路搭出来的电路就直接VCC与GND连在一起了,上电就短路。请问是我那4款芯片都是坏的,还是芯片本身就是这样的,

是我没有读懂手册,搞错了?原理图见附件