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DAC8581只能输出几个特殊电压

Other Parts Discussed in Thread: DAC8581

在使用DAC8581时,参考电压3.3V,只能输出下表中的电压:

 

也就是SPI输出7FFF、4000、0000、BFFF、8000时候均能输出相应电压。(令测试输出1FFF也可以)。

我的波形截图如下:(SPI照此输出后,DA输出电压不变)。恳请大家帮我分析分析。

 

电路是按照如下原理图搭建的:参考电压已经改为3.3V (2.5V时候情况一样)。