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ADS1247的AD值波动很大

Other Parts Discussed in Thread: ADS1247

现在用ADS1247,80sps采样率下,AD值变化有低14位;20sps采样率下,AD值变化低8位;这是24位AD,难道不能用80sps或者更高的采样率获得比较稳定的AD值吗?电路是AIN0是一个0~0.6V的直流信号,AIN1接地,用吉时利的7位半的万用表测量信号只有变化几uv,应该不会有低14位AD值变化。