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PGA308,为什么输出电压Vout突变到0V?

Other Parts Discussed in Thread: PGA308

PGA308接陶瓷压阻传感器,配置完毕后,放大正常,输出电压0.5V-4.5V,但是为什么每次输出电压达到1.28V左右的时候,输出电压Vout会突然降为0V,然后再升上来,请问这是怎么回事呢?