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您好,根据您的描述,建议您从以下方面排查故障。
1. 观测INA1 INA2是否稳定,可以考虑增加驱动门。
2.VREF信号驱动能力是否足够,是否有抖动,可以考虑增加驱动buffer。
3.电源是否稳定,电路图中没有看到电源引脚处放置退耦电容。
4.Layout 布局不合理导致信号干扰,参见手册Figure 11-2. Layout Recommendation