AD7280A

When  AD7280A detects  static battery voltages, the result is normal, but when the battery power supply circuit works at 10khz, the sampling result is completely wrong. What are the possible reasons?

AD7280A检测静态电池电压时结果正常,但是当电池供电电路工作在10khz时采样结果完全不对,请问有哪些原因呢?