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AD9914 DAC calibration

Question asked by IanF on Nov 19, 2012
Latest reply on Nov 26, 2012 by DSB



I'm using the AD9914 eval board to generate short, phase stable 500 MHz bandwidth frequency ramps at a 10-100 Hz repetition rate. The board is working great for this application, except the phase of the ramps slowly walks off over a period of 3-5 minutes. However, when I calibrate the DAC by pushing a button in the eval board software it resets the phase of the board, halting the slow phase walkoff. If I push this button every ~30 seconds I can effectively solve the problem. This is an OK fix, but I would like to be able to automate the DAC calibration or fix this problem in another automated fashion. I was wondering if anyone has any recommendations for setting up an automatic DAC calibration every few seconds, or another approach to this issue?