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DAC3162: DAC3162EVM输出信号为何总是正负信号,即使 TSW1400软件设计的是只有正输出

Part Number: DAC3162
Other Parts Discussed in Thread: DAC5687, DAC5686

我购买了德州的dac3162和其评估版,根据软件存入的数据表都是正的信号,存入一个阶梯波的excel数据,但最终输出的波形出来的却是正负电压的波形,波形正确,但电压不对,请问为何以及如何解决呢?