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关于PGA305的应用问题

Other Parts Discussed in Thread: PGA305

最近在使用PGA305芯片进行调理验证,出现了一个奇怪的问题。想要调理出一只0.5~4.5V输出的变送器,但调完后零点一直是0.255V,中点和满点都很正常,分别是2.501和4.501,这是为什么?需要修改哪些配置吗?