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Part Number: DIR9001
When do we need to use external XTAL with DIR9001? How do we measure the sampling frequency of the incoming audio stream while playing the audio data?
There are TWO cases where a 24.576 MHz crystal is required –
• When using the internal sampling-rate-calculator inside DIR9001 to calculate sampling rate.
DIR9001 calculates the actual sampling frequency of the biphase input signal and outputs its result through dedicated pins. To use this feature, a 24.576-MHz clock source must be supplied to the XTI pin. The 24.576-MHz clock is used as a measurement reference clock to calculate the actual sampling frequency.
• When using DIR9001 as a 24.576 MHz clock generator.
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