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!URGENT - PCM2902C vs PCM2902B: Line vs microphone input terminal

Fabio Bucci
Intellectual 2595 points
Other Parts Discussed in Thread: PCM2902C, PCM2902B

I do have an urgent issue: customer is in the process of releasing a new product embedding the PCM2902C but running into some issues when using Windows 10.

As it turns out, while in the previous version embedding the PCM2902B Windows 10 detects the device as microphone with no issues in the audio settings either on the USB or on the SPDIF line, when using the PCM2902C, Windows 10 detects the device as line causing some issues on the SPDIF audio settings.

Where such an issue come from? How can customer get rid of it?

Please let me know as soon as possible

Thanks

  • 0
    TI__Guru* 95145 points
    Hi Jack,

    This is actually a fix from B to C revision of the PCM290x family. Originally these devices were detected as line by the windows systems previous to W7. Then something in the way that windows recognize USB devices made it to detect PCM290x and PCM290xB as mic and that was a problem as the system added too much gain. Then C revision of PCM290x family fixed this problem and these devices are detected as line in W7 and later windows systems.
    What kind of issue is it causing on SPDIF settings?

    Best regards,
    -Ivan Salazar
    Texas Instruments
  • 0 in reply to Ivan Salazar
    TI__Intellectual 2595 points
    Hi Ivan,

    the issue is in the SPDIF audio level setting - since the device is detected as line the SPDIF audio level is reduced roughly by half compared to the expected level.

    Do you confirm the only way to fix it is to work on the Windows 10 driver side? Or you see HW workarounds?

    Please let me know

    Fabio
  • 0 in reply to Fabio Bucci
    TI__Guru* 95145 points
    Hi Fabio,

    Unfortunately I think there is no way to workaround this other than driver. Although these devices work with standard USB Audio Class.
    The S/PDIF is a line digital interface and even the volume control does not affect this interface.

    Best regards,
    -Ivan Salazar
    Texas Instruments