There is description of input gain register in ther data sheet. But I don't understand how should I set the register value.
According to the AD9985A data sheet page 20, value 255 to input gain register correspond to 1.0V full scale and value 0 correcpond to 0.5V full scale range. When RGB signal with 0.7Vpk is used, what value should I set to the input gain register? Also I'd like to know an equation or relationship between register value and input range, would you advise me? I know there is figure 4 but I don't understand how can I read the value from this plot.