In datasheet AD9739 in page 40:
It has been found through characterization that the optimum setting is for both inputs to be biased at approximately 0.8 V. This can be achieved by writing a 0x0F (corresponding to a −15) setting to both cross controller registers (that is, Register 0x22 and Register 0x23).
As we can see from datasheet default values of this registers = 0. What internal offset voltage is default on pins DACCLK? How this internal voltage changes by different values of registers?