Dear Eben, Thank you for your reply! However, if you read what I wrote above carefully, I stated "I already tried all possible values of "pll_vco". However "pll_lfvolt" stayed the same.". Before I post my question, I tried all possible values of "pll_vco" (total of 64 combinations of 6 bits). But "pll_lfvolt" was alway 000b regardless of values of "pll_vco". Of course, the output waveform changed with "pll_vco". I've found the value 53 the best , which means the output waveform of DAC is of high quality although "pll_lfvolt" stays 000b. Because of that, I'm confused if I should declare the configuration of DAC3482 successful or do something more. Thanks a lot! best regards, Shim
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