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有关DAC8560的参考电压问题

Other Parts Discussed in Thread: REF3020

         我想用REF3020给DA做参考电压,DA的自带参考电压默认是2。5V的,REF3020是2.048V的,接上3020后它的输出就由2.048变为2.5V了。我想知道这是为什么?   

       我程序里已经把外部参考电压使能了