ADAU1446 CLKOUT modulating

Hi. I've built a prototype using the ADAU1446 using the CLKOUT as fs*256 to clock a CODEC. It's working and I'm not conscious of any problems with the output signals that might be caused by the master clock. However, CLKOUT appears to be frequency modulating at about 24kHz (fs=48kHz), the oscillator itself is stable. As best as I can tell fs is also stable. Any ideas? Is this something I'm likely to see using the fs*256 option? Would I be better using the buffered oscillator? tia Gordon

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