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MSP430F425A的AD精度提高问题

打样的PCB,MCU是425A,外部参考1.5V,测试AD采样有七八十个字的波动,现在把AD输入接地,采样仍然有三四十个字的误差,想控制在10个字的范围,VREF参考到底需要什么样的指标?有参考图吗?谢谢。