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DSP与DAC8564的链接

Other Parts Discussed in Thread: DAC8564

想知道,如果想把DSP5509A的Mcbsp口配置成SPI模式,与DAC8564通讯,并且DAC使用内部参考电压,首先VrefH是接地吗?VrefL用接吗?然后,LDAC的功能是什么,可否始终接地?

谢谢!!!