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关于VCA2615的问题 急!求指导!

Other Parts Discussed in Thread: VCA2615, ADS1610

最近一直用VCA2615作为ADS1610的ADC driver,但是却莫名其妙的连着坏了两片VCA2615.这两片VCA2615问题是一样的,都是有输入信号,但是输出只有偏置电平,没有波形。第一片发现这个问题之后,检查各引脚电平,发现一个问题,两个power down引脚PDL和PDV都是通过上拉10K电阻到5V,结果PDV引脚接近5V,而PDL引脚只有2.4V左右,于是换了片子再试,结果正常工作。可第二天再测时,VCA2615输出再次只有偏置没有波形,测PDL引脚大概4.4V左右。不明白是什么原因,请求给予指导,谢谢!!