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AD5420 and AD5421 DAC update rate

Hi

I'm using AD5421 and AD5420 in my design.

I have found one observation with respect to both DAC code update rate. I have attached a video file below.

Here I was setting 4mA, 8mA, 12mA continuously through code. But change between these values are showing an intermediate value as a step. What is the reason for this. How can I avoid this.

Regards

Nidhi P Shetty