Question is I2S,input 44.1k,48k available auto detection function at ADAU1761 or1702 ?
No there is no way to detect what the sampling rate is coming in. There are no sample rate converters in these DSPs so you have to know what the sampling rate is. If it is unknown, or can change, then you will need to look at the ADAU1442 or the ADAU1452 which have sample rate converters. Then the input will adapt to the incomming sample rate and convert it to the DSP rate.
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