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求解,为何TLC5510在未接如模拟信号时,模拟输入口会有一个1.6V左右的电压

Other Parts Discussed in Thread: TLC5510

TLC5510在工作电压和时钟信号正常的情况下,在没接如模拟信号时,模拟输入口用万用表测量有一个1.6V左右的电压,且D1~D8输出口有j几个有数据,当接入模拟信号时,又能正常转换为数字信号,请问,这种现象是正常现象,还是芯片坏了? 谢谢!!