I need your help. I designed a digital filter by Matlab and load the transform function parameters into the ADAU1701 board.The curve simulated in sigma studio is right，but I test the board use a spectral analysis SW and the phase shift.
The first figure is simulated by sigmastudio and the second one is test by spectral analysis SW.
Is the phase shift due to the latency of the board,which is between the ADC and the DAC? How can I solve this problem and get a good curve.Thanks for your help.