PCMD3140: GPIO1 as SDOUT2

Gabriele Baroli

Part Number: PCMD3140
Other Parts Discussed in Thread: PCMD3180

Tool/software:

Hi,

I'm trying to use the converter above in I2S output configuration together with four PDM mics.

The converter output data is collected by a miniDSP MCHStreamer, set to 176.4kHz. The soundcard is only capable of receiving standard I2S data, so with only one channel in the left frame and one in the right frame.

On the available datasheet, in section 7.3.1.3 is told that GPIO1 pin can be configured as a secondary output data lane for the ASI. In the rest of the document is not mentioned how to do so, however.

Follow up question is, assuming it is possible to do what mentioned above, would it be possible to route channel 1 and 2 to SDOUT, and channel 3 and 4 to GPIO1 in SDOUT2 configuration?

Thanks in advance

5 months ago

0 Daveon Douglas 5 months ago

TI__Mastermind 23360 points

Hi Gabrielle,

Our adc expert will address question asap

0 Lakshmi Narasimhan Badrinarayanan 5 months ago in reply to Daveon Douglas

TI__Expert 4710 points

Hi Gabrielle,

It is mentioned in the post that the sampling rate for device operation in the application would be 176.4kHz. The signal chain section in the datasheet mentions about operating multiple channels at sampling rates higher than 48kHz (section 7.3.6 of the datasheet), with details in the application note, as mentioned in the datasheet.