Automatic Timing Optimization Mode AD9788B

Hello, 

I'm working on the AD9788, I tried to use the  Automatic Timing Optimization Mode. I set Data timing mode (Register 0x02, Bit 3 = 1), but still have a noisy DAC output.

Also, I saw that the same mode is not working in AD9779A (https://ez.analog.com/data_converters/high-speed_dacs/f/q-a/22782/ad9779a-timing-optimization/128790#128790)

Is it the case for AD9788 ?

Thank you 

Khaoula