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关于ADC芯片选型的问题ADS8688

Other Parts Discussed in Thread: ADS8688A, ADS8688, ADS8688AT

问一下官方,ADS8688有三种型号,ADS8688,ADS8688A,ADS8688AT,好像还不是同一个手册上的型号,请问这三种型号有什么区别?如何选择?如果芯片有区别,万一买错了怎么办?