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28335采集精度只有8位,请问如何校正?

Other Parts Discussed in Thread: REF3020

使用28335芯片做的模拟量采集板,使用外部参考电源芯片REF3020,测量出来的结果波动很大,后三位一直在波动,差的时候后四位都在波动,请问是硬件设计的原因还是软件设置方面有需要注意的地方呢?