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Starterware/PCM1861EVM: PCM1861EVM Sample Sound

Marc48067
Expert 2000 points
Part Number: PCM1861EVM
Other Parts Discussed in Thread: PCM1861, PCM1863, PCM9211

Tool/software: Starterware

Hello,

I use the PCM1861EVM with the USB-I2X board. The USB-I2X board is connected to the PC via USB. When the EVM is powered up, a sample sound is transferred via USB and can be heared on the PC.

1. How can I disable the sample sound? I just want to connect a mic to the PCM1861 and hear the sound on the pc side.

2. The jumper settings for mode 0 and mode 2 are exactly the same (j8 and j11 installed, j10 removed). I just need the usb mode without SPDIF. How can I achieve this?

3. Is it possible to replace the PCM1861 with the PCM1863 on the EVM? Or do we need another EVM?

Thanks in advance

Marc

  • 0
    TI__Guru 57800 points

    Hi, Marc,

    The noise you hear in the PC from the PCM1861EVM is related to the USB-I2X board trying to process the data that is sent to the PCM9211. This is because by default, the PCM9211 is the master device and you need to configure the USB-I2X board as the master device to receive and process the correct data. 

    This is easily done by using PurePath Console 2 software. After the board is identified, just select Mode 2. The correct data will be send to the PC through the USB-I2X board.

    The PCM1861 is pin to pin compatible with the PCM1863, so the same EVM can be used. You need to consider that PCM1863 is software controlled. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Expert 2000 points

    Hi Diego,

    thanks for your help. Now I can hear my supplied Line-In sound on the pc side. Next step is to connect an analog microphone. I inserted J9 for the bias voltage. Additionally MD2 and MD6 are pulled high for usage of single ended input 4 with maximum gain. But I saw that resistors r8, r9 are not present. So bias voltage is not forwarded to the cinch connectors. Is it sufficient to place the resistors and connect the analog mic directly at the cinch connectors? Or do I have to take into account additional considerations?

    Thanks in advance

  • 0 in reply to Marc48067
    TI__Guru 57800 points

    Hi, Marc,

    Populating the corresponding resistors and inserting a shunt in JP9 is sufficient to provide a micbias connection for an analog microphone. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer