ADAU1761 ADC_SDATA pin direction? In or Out?
The ADAU1761 datasheet says that chip pin ADC_SDATA-GPIO1 is an output when used for serial data (e.g. figure 26). Wouldn't an output pin be used to drive a DAC? Why is it marked for ADC function? Likewise for the DAC_SDATA-GPIO2 pin, why is that an input? I didn't check but assume the ADAU1761Z eval board matches this marking.
So do I wire an ADC to the ADC_SDATA pin or to the DAC_SDATA pin?
Audio Signal Processors
SigmaDSP Audio Processors
adau1761
ADC_SDATA is the data output from the ADCs, so when configured in the serial port mode, it will be a digital output. The DAC_SDATA is the data input to the DAC. If you are connecting an external ADC to the serial inputs of the ADAU1761, then you will connect that serial data to the DAC_SDATA pin.
Thanks for the reply. I find that naming convention very weird, because the serial input to the 1761 comes from an ADC, not a DAC, and that input pin would ordinarily go to the DSP engine and not to the DAC in the 1761. But at least I understand it now.
This naming convention might be easier to understand if you consider the case of a pure codec, like the ADAU1361, which does not contain a DSP.
In the case of the ADAU1361, the input to DAC_SDATA is output directly on the DAC, and the input signal to the ADC is output on ADC_SDATA.
This question has been closed by the EZ team and is assumed answered.
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