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PGA309校正完成后,GAIN DAC和ZERO DAC的数值很大

Other Parts Discussed in Thread: PGA309

我用PGA309校正我的电阻桥传感器,校正完成后的结果不对,设定的电压输出是最小0.5V,最大4.5V,校正完成后,输出最小0.055V,最大4.3V,这个结果感觉不对,正确的结果应该和设定的一样,在校正结果中发现GAIN DAC   和ZERO  DAC的数值特别大,分别为3.8和2.1,请问各位是啥原因?