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Original question:

PCM9211 / PCM 2902C

PCM2902C: PCM2902C can decode the S/PDIF input signal from Broadcom Set Top Box palyer,but can't decode the siganal from other Set Top Box based on Hisilicon and Realtek

user5098220
Prodigy 30 points
Part Number: PCM2902C
Other Parts Discussed in Thread: PCM2902

Dear Sirs,

Application: Transfer the S/PDIF signal to USB 

Problem:

1 We use the player based on Broadcom chipset as S/PDIF output,then input the S/PDIF input to PCM2902C board.It is ok.

2 We change the player based on the Hisilicon or Realtek chipset as S/PDIF output,then input the S/PDIF input to PCM2902C board.It can't work.We doubt that PCM2902C can't recognize the signal from the other chipsets.

Pls help to clarify why it can has this issue.

Thanks!

  • 0
    TI__Guru 62085 points

    Hello,

    Thank you for using TI's USB Audio devices.

    Can you confirm what the failure symptom is when using the Hisilicon or Realtek chipsets?  Does the device not lock on to the incoming S/PDIF signal?

    Can you also confirm the Hisilicon and Realtek S/PDIF output drivers meet required digital input Vih and Vil levels for the DIN signal?  If you share a datasheet we can review those devices.

    Also, please confirm they're using one of the required sampling rates (listed below)?

    • 48-kHz 16-bit stereo

    • 44.1-kHz 16-bit stereo

    • 32-kHz 16-bit stereo

  • 0 in reply to Collin Wells
    Prodigy 30 points

    Hi Collin,

    If we connect the Hisilicon palyer SPDIF to the Yamaha Power Amplifier,it is OK.

    But connect to the PCM2902,it does not work.Hi3798M V200 Data Sheet 01-General Information.pdf

  • 0 in reply to Collin Wells
    Prodigy 30 points

    The analog input is ok for SPDIF.But the SPDIF digital input can't work.

  • 0 in reply to user5098220
    TI__Guru 62085 points

    Hello,

    The PCM2902C is meant to operate with TTL level S/PDIF input signals that typically come from TOSLINK style optical connectors.  If you're trying to directly connect lower-level COAX output type S/PDIF signals to the PCM2902C then it will not work.  

    Unfortunately the HiSilicon document does not contain the required information to understand that type of S/PDIF levels it may be putting out.  Can you take a screen grab of the S/PDIF signals coming into the PCM2902C?