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adau1701 serial input and internal adc-dac problem

Question asked by Yuran-n on Mar 31, 2013
Latest reply on May 6, 2013 by BrettG

Hi

I use I2S codec in slave mode, as specified in the datasheet:

-If an external ADC is connected as a slave to the ADAU1701,
use both the input and output port clocks. The OUTPUT_LRCLK
(MP10) and OUTPUT_BCLK (MP11) pins must be set to master
mode and connected externally to the INPUT_LRCLK (MP4)
and INPUT_BCLK (MP5) pins as well as to the external ADC
clock input pins. The data is output from the external ADC into
the SigmaDSP on one of the four SDATA_INx pins (MP0 to MP3).

Why internal ADC and a DAC at this time don't work?
As soon as I tear OUTPUT_LRCLK - INPUT_LRCLK
or OUTPUT_BCLK and INPUT_BCLK internal ADC and DAC start working (I2S codec does not work)
Is this normal?
?


Thanks

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