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Trying to convert USB audio to analog

Prodigy 145 points

Replies: 3

Views: 29

Hello,

I have an application where I have USB audio and am trying to convert it to analog for use in a standard 3.5mm audio jack. I'm unsure of the parts that go in between the USB hub and the audio jack. Does TI sell an IC that can convert the signals from USB audio to analog, and do any needed amplifying? 

Thanks,

Rob

  • Yes, please take a look at the PCM2704C or the PCM2706C.  These devices act as a USB audio bridge and feature a headphone amplifier as well.

    Thanks,

    Paul

  • In reply to Paul_Frost:

    Thanks Paul. These devices seem to be what I'm looking for. I also need a microphone input, which I don't see on the datasheets. Is there another USB audio codec that has a microphone input? 

    I also need to support push-to-talk (PTT), but I believe that is handled external to the codec. 

    Additionally I need to support USBPD. This can be done by routing the D-/D+ pairs also to a microcontroller with a PD controller, possibly with a mux in between. Are there any microcontrollers / PD controllers that have built in USB audio codecs?

    Thanks,

    Rob

  • In reply to Rob Helvestine1:

    You can also look at the USB codec devices, like the PCM2912.

    In regard to the microcontroller questions, you might what you check in on the Embedded Processing forums at e2e.ti.com, but to my knowledge, we do not have an MCU+CODEC.  We do have some DSPs that might be able to interact with an external DAC and ADC, but that would probably be a significant development.  You could also check out XMOS or Cmedia's solutions.

    Thanks,

    Paul