Please make sure that the power supply to the chip is a stable 5V supply. If the power supply has too much ripple, it will cause fluctuation in the output.
2. Please refer to the datasheet to ensure that the capacitance connected to RDC pin (Reference Buffer Decoupling) matches the requirements.
3. If using an external reference, please ensure that the reference voltage is stable.
4. Please check whether the layout complies with the guidelines provided in the datasheet: Specifically, please refer to the "Layout, Grounding, and Bypassing" section.