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关于ADS8399设计AD采样问题

Other Parts Discussed in Thread: ADS8339

ADS8339设计输入检测电压范围为5V,输出的AD值应该为0x0000-0xFFFF,但测试过后实际输出的AD值在0-2.5V输入时,变化范围为0x0000-0xFFFF,当输入电压升高到了2.5-5V这段电压值范围时,AD输出的范围也是0x0000-0xFFFF,输入的5V电压被分成了两断,以Vrefin/2为分界点,想问一下 这是因为芯片损坏了还是因为器件的性能原因。求助。