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DAC数模转换器选型问题

Other Parts Discussed in Thread: DAC8228

亲爱哒工程师,

     您好,我现在想选择一款DAC输出10~4000HZ可调的方波(精度1HZ),幅值是正负10V(精度0.01V),通道>=6个,之前选择的是SPI接口的DAC,结果发现精

度满足不了1HZ的要求,求TI的工程师如果看见了给我推荐一款合适的DAC芯片,最好是并行接口的,我之前选了一款DAC8228,但是这款芯片需要外部参考电压,

输出范围是外部参考电压的3倍,那我用3.3V的参考电压可以吗?求好心人如果知道帮忙解答一下,谢谢啦~~