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关于ADS1216Y的IDAC1,IDAC2恒流输出问题

在产品中运用D0,D1,D2输入输出端口控制高速开关0-7通道状态,IDAC1,IDAC2恒流输出,不同的通道开关状态输出不同的恒流,但是通道1的输出电流异常,比设计数值高几倍,其它通道正常,不知道什么问题?把高速开关去掉,IDAC1,IDAC2恒流直接连到输出也是一样,晕了!