I need some info about the maximum update rate of the AD5422?
There is no update rate specified for the AD5422 on the Datasheet. What you can do is calculate how fast the AD5422's output will respond to a change in digital code, this is the interface timing added to the settling time. The minimum timing specifications are listed on page 10 of the datasheet.
T = 24(T1) + T4 + T5 + Tsettle
792nS + 13nS + 5uS + Tsettle = 5.805uS + Tsettle
Tsettle is the settling time , this depends on the step size and the capacitive load (or inductive load for the current output). This is specified for a small number of steps on page 10 of the datasheet (Table 4)
Please also note that placing a compensation capacitor on CCOMP pin will also effect the settling time.
I'm moving this to the Precision DAC community where someone can answer this for you.
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