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差分输入型AD(带有两个参考电压)如何进行模数转换?比如芯片ADS5553

您好!请问ADS553这个AD芯片,它的输入是差分输入,有两个参考电压,输出是14位二进制补码格式,我想问:对于差分输入的AD,模拟量是怎么转换成数字量的,比如:当输出为14个1时,我的AD差分输入是多少呢?当输入是14个0时,我的差分输入又是多少呢?我看了datasheet,没有在手册中找到相关信息,请您知道,多谢!