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AD9985A Gain register

Question asked by funk48 Employee on Jan 17, 2013
Latest reply on Jan 24, 2013 by joe.triggs



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.