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DAC38J82: 如何开启NRZ输出模式

Part Number: DAC38J82

我在使用DAC38J82EVM时在FPGA上使用dds产生了一个正弦波并输出,示波器测量波形如下:

理论上应该是平滑波形,但实际上输出一个点后就会回落,这似乎是处于RZ输出模式下,请问如何开启NRZ模式平滑输出?

谢谢