Search FAQs on the left to see if your question has been answered. Click on the dropdown to view all of the documents associated with the product. If you can't find your question, click on Ask a Question.
We clock the AD7793 with an external 128kHz clock which is derived from the microcontrollers clock. Therefore we expect no runaway effects between uc timer and AD7793 output data rate (10Hz by the way). But we see a difference in the DRDY signaling (over a time scale of several minutes and hours) and therefore suspect that the output data rate of the AD7793 is not exactly 10Hz but something nearby. The AD7710 which we use in another project has for example 10.00064 Hz instead of 10 Hz. Could you please supply us with the exact divider between input clock and the output data rate at 10Hz?
The output data rate is slightly less than 10 Hz. It is 9.99 Hz. Attached is the filter Excel model for the AD779x family. I have set up the model for the 10 Hz theoretical output data rate. As you can see from the model, the actual output data rate is 9.99 Hz and the settling time is 201 ms.