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DAC38J82: How to turn on NRZ output mode

Part Number: DAC38J82

Hi team,

Here is a question from one of our customers:

When using DAC38J82EVM, I use DDS on FPGA to generate a sine wave and output it. The waveform measured by oscilloscope is as follows:

Theoretically, it should be a smooth waveform, but in fact, it will fall back after outputting a point, which seems to be in RZ output mode. How can I turn on NRZ mode for smooth output?

Best Reagrds,

Amy Luo