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DAC121S101: dac121s101 输出减半

Part Number: DAC121S101

按照规格书是DAC是   0-5v  输出 ,实际是  0-2.5V  输出。       发送2048  输出是  1.25V ,   发送  4095 输出是2.5V.   请问故障出在哪里?