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PCM2906C Output timming issue

Other Parts Discussed in Thread: PCM2906C

Hello,

We are using the device PCM2906C in a system and we are found this problem: We are sending an audio stream to a DAC converter, in which the sample rate is drived by a TCXO with less than 1ppm (we have measured the tolerance of TCXO with a Pendulum-CNT66 Timer Counter). The same samples are sent through USB to PCM2906C with the same rate that DAC converter. We expected to found at SPDIF output of PCM2960C a signal with the same tolerance, but when we measure the frequency, we get a deviation of -135 ppm (we do this measure with a Audio Precision System Two). Please somebody could tell me what can be wrong?

Best regards.