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Is there jitter in MCLK of 21489?

Question asked by HenryL Employee on May 10, 2012
Latest reply on May 11, 2012 by Harshit.Gaharwar

figure 1

citation original.jpg

figure 2



We found the MCLK generated by the SPDIF of ADSP-21489 is noisy and that harmonic is above the noise floor around 20dB (figure 1). While the MCLK from AKM demo board is clean (figure 2). Please refer to attached photo about how we hooked up the MCLK/BCLK/LRCLK/SDATA from AKM demo board to the ADSP-21489 board.

How can we upgrade the performance of the MCLK generated from SHARC?