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Interfacing audio ADC PCM4202 to a Firewire

Thierry Baj
Prodigy 10 points
Other Parts Discussed in Thread: PCM4202, PCM4204, OPA1632

Hello Forum,


I'm planning to develop an audio 24-bit, 216khz audio ADC PCM4202 with a firewire output.

It's my first attempt to make such a thing.

Which chips will be appropriate for this purpose?

Any help will be appreciated.

Thanks

  • 0
    TI__Genius 9175 points

    Hello,

    Let me direct you to the PCM4204 EVM or evaluation board HERE. The user’s guide HERE shows the schematics for a typical pro audio application including front end differential buffers that work for both differential inputs such as XLR and single ended such as RCA or ¼” instrument cables.

    It is important to note that the input buffers (OPA1632) set a DC offset on the differential signal pair going into the PCM4202. This centers the audio input to the center of the PCM4202 voltage rail since it is a single rail device.

    This is done by using the VCOMR and VCOML pins on the PCM4202 part (which automatically outputs the center of the voltage rail) . A buffered copy of this voltage is then put onto the VCOM pin of the OPA1632 floating the differential pair.

    This is the typical application of the PCM4202 device.

    The output of the PCM4202 is I2S digital audio so you will need a USB and/or firewire transceiver that can convert I2S into the desired protocol.

    Regards,

    Matt