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dac5571在msp430f149中电路该怎么设计?

Other Parts Discussed in Thread: MSP430F149, DAC5571

msp430f149单片机,通过adc12采集外部数据,单片机内部对采集数据进行运算,希望通过dac输出模拟量。这样子设计的pcb板子,直接测j8和j9两端的电压值可以吗?为什么我的输出一直未0??