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ADS1256的PGA大于16结果出错

zhongling guozhognling
Prodigy 214 points
Other Parts Discussed in Thread: ADS1256

如题，用ADS1256采集，Vref=2.5，VIN=1.2mv左右，PGA=1，2，4，8时正常，PGA=16时结果等于0，PGA=32时结果等于-0.04mv左右，PGA=64时结果等于0.2mv
寄存器设置完以后重新读一遍，没问题
自校准开、关  效果一样
DATARATE从30000SPS降到50SPS，效果一样

麻烦各位帮看下，多谢！