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PurePath Dev Kit Selection Questions

Dan Allen
Prodigy 130 points
Other Parts Discussed in Thread: TLV320AIC34EVM-K, CC2590

I am trying to decide which dec kit to buy at this point, either the headset dev kit or the regular purepath dev kit.  The application needed is a stereo audion stream from master to slave and then a voice link for both directions, master to slave and slave to master.  So I believe I could either use headset base station application role (2 audio channels from master and one from slave) and headset for the receiver, or the stereo bi-directional.  On the slave, the stereo audio and the voice audio from the master needs to be full duplexed so you can hear both the streaming music and the voice at the same time.

Questions:

1 - Which dev kit is better suited for this application?  (I imagine the regular kit is in order to have all of the proper inputs for stereo, mic, and speaker on the master)

2 - Is there any kind of case or protective housing that can be purchased?

3 - What is a good bluetooth interface to use with this dev kit, say the stereo source was coming over bluetooth, or (it may sound crazy, and maybe it is) a bluetooth headset at the slave and master for the voice link?

 

Thanks!

  • 0
    Prodigy 130 points

    Also, let me add that I really like the size, portability, and battery pack of the wireless headset but am afraid that is doesnot have enough inputs.  I will get the the headset if I can get enough input output connections.

  • 0
    TI__Expert 7160 points

    Hi Dan,

    1. I would say that the CC85XXDK is the best kit for you. As you mention you have more inputs on this kit than the CC85XXDK-Headset.

    You could assign one audio channel for each audio stream i.e. "left" and "right" and "mic" from the master, each being a separate audio channel, and then assign a fourth audio channel for the "mic" from slave to master. This gives you a total of 4 audio channels in your network. Since you have 3 audio channels in one direction you need the AIC34 codec on both the master and slave since the onboard codec aic3101 can only handle two audio channels in each direction. The TLV320AIC34EVM-K can be plugged onto the PPW Audio EB for evaluation. See this design note for details: http://www.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=swra383

    Another approach is to mix the master mic onto the left and right audio stream prior to digitizing, and only send two audio channels from master to slave. And then assign a third audio channel for the slave mic gpoing in the other direction. Then you don't need the aic34 codec at all.

    2. No, unfortunately.

    -Kristoffer

  • 0 in reply to Kristoffer S
    Prodigy 130 points

    Kristoffer -

     

    Great idea mixing the signals! Doing it that way I could get away with the two 3.5mm jacks that come on each of the CC85XXDK-Headset.  So one last question with these dev kits, they both come with the CC22590 range extender, in your tests how do the ranges of these dev kits compare? What is a ball park estimate just in an office environment.  I imagine the antenna are slightly different.

     

    Thanks for your help.

     

    Dan

  • 0 in reply to Dan Allen
    TI__Expert 7160 points

    Dan,

    The kits perform quite equally. The CC85XXDK has the possibility of using a whip antenna mounted on an SMA connector, or the same PCB antenna as used on the CC85XXDK-Headset. The whip antenna is a little bit better (a little more omni-directional).

    -Kristoffer

  • 0 in reply to Kristoffer S
    TI__Mastermind 21125 points

    Dan, 

    The CC85XXDK comes with modules with and without the CC2590 (two of each). This way you can test the impact yourself an decide what to choose for your own design. If you are really cost constrained you can even play around with only having the CC2590 on one side of the link. 

    Regards, 
    Kjetil 

  • 0 in reply to Dan Allen
    TI__Expert 7160 points

    Dan,

    You need the CC85XXDK even though you're going to mix the channels. The limitation with the CC85XXDK-Headset is the number of physical connectors. You only have one 3.5mm jack input, and hence you can only input your stereo audio OR a mic signal, not both at the same time. On the CC85XXDK you have both a left and right RCA connector for the stereo audio AND a 3.5mm jack for mic.

    -Kristoffer