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ADAU1701 - Sample Rate Issues

Question asked by eepmc on May 19, 2016
Latest reply on May 27, 2016 by KJBob



I am just prototyping a board with the ADAU1701 and have some strange issues regarding audio not being the correct frequency, probably related to wrong sample rates somewhere.


The set up is as follows:

Crystal = 12.288Mhz

PLL= set for 64Fs

Program set to 2x length (96kHz operation)

Sigma DSP project blocks set to 96kHz


When I use the tone generator in SigmaDSP to send a 1kHz tone to the DACs, the measured output is at 250Hz. Obviously something is wrong and the fact that it is exactly 1/4 of the frequency seems like a setting is wrong somewhere.