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PCM2906C application

George Biner (Arrow)
Intellectual 705 points

Other Parts Discussed in Thread: PCM2906C

Hello:  my customer has a question on the PCM2906 USB codec: 

>>>>
The application is for a PTT headset with two sources of audio inputs to the earphones, one to the right and the other to the left.  One audio source is analog audio from a Smartphone, and the other is a digital source from a radio, through the radio's USB port.

The PTT needs to be powered from either the USB port or from the smartphone side (only when the radio is not connected).

A question from the end customer that needs answer immediately is "can the PCM2906C operate independently, passing the analog audio from the smartphone to the PTT's earphone, without the USB port being connected?"

Can you help or direct to someone familiar with this PCM2906C?

Currently, another end customer is designing this PTT, but the Codec used in the design is NXP UDA1325, which may be obsolete already, so we should be able to get PCM2906C into the design. 

>>>>

I think this will require an AIC32xx codec and a separate streaming USB device.  Also, not sure of which codec can do independent right and left signals (most are dedicated stereo).  Please advise on the best way to do this, thanks. 

George Biner

  • 0
    TI__Guru**** 189401 points

    Hey, George,

    How's is going in the land of fruit and nuts?

    Unfortunately, you can't do what you want... The part needs USB to be active at all times...

    I think your conclusion is correct, you need to implement a standard codec in addition to the PCM2906 and use some fancy footwork to get the signals where you need them.

    There is nothing magical about Left or right or stereo. Regardless of what you call them, they are independent paths, so you can feed whatever you want into the one called "left" and something completely different into the one called "right" and all will be well in the world.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 10 points

    Hi Don,

    By USB connection for the PCM2906C to function, do you mean not just power, but also going through some setup process, because we can supply the power aside from USB. (Just to make sure.)

    Thank you.

    Sandy

  • 0 in reply to Sandy Chang
    TI__Guru**** 189401 points

    Hi, Sandy,

    My understanding is it needs to be enumerated to do what you want...

    -d2