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ADS1247: 使用ADS1247读取10KNTC温度传感器ADC,会有大概10秒的周期波动

Part Number: ADS1247

读取10KNTC温度传感器,配置39K采样电阻常温下有周期性波动,使用外部参考电压源,50uA电流源,PGA为1,DR = 80 SPS,会有大概10秒的周期不定期波动,这种抖动应该可以排除是外部原因,想问问是不是配置问题造成的,还是电路原因造成的