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请推荐能作为参考电压的电源芯片

Other Parts Discussed in Thread: REF5020, REF5050

现在想使用电源芯片提供精准的5V和2V作为AD和DA转换的参考电压,能不能推荐两款符合这种要求的芯片。我的电路中供电电源只有12V和5V两种,所以这两种参考电压的芯片其电源也只能为5V或12V。谢谢!