Hey Naoki, I see in your scope shot that your DAC clock is running right when the DAC outputs a signal. From what i understand, the DAC will still output data if the input clock is running. Therefore, while the clock is running, the dac will output garbage if there is noise on the input data line. Try turning off the input clock and verifying that there is no data on the output before asserting SLEEP mode. Let me know your results. Thanks Yusuf
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