About CLKIN wave form for ADAU1442 and ADAU1452
Dear support team,
We want to know specification of CLKIN for ADAU1442 and ADAU1452.
We will use 12.288MHz clock source for CLKIN.(not crystal)
Q1: Is Input level of CLKIN same as digital input specification?
Q2:Can CLKIN receive a clipped-sine wave?
Q3:What is accuracy of frequency(ppm) needed?
Best regards,
Takepiro
Audio Signal Processors
adau1452
adau1442
adau1445
SigmaDSP Audio Processors
Hello,
A1: Yes, the clock input level matches that of the other digital IO pins.
A2: Yes, the pin works as an edge detector, so a clipped sine wave should be fine.
A3: The duty cycle of the waveform must be between 25% and 75%. Frequency inaccuracy will not cause functionality issues, but could potentially worsen the accuracy of filters in the DSP program. Jitter is OK up to a certain level - however, the PLL might lose lock if jitter is very bad.
I hope this answers your questions!
Brett
Brett-san, Thank you very much. Takepiro
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