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Design and Programming (CC8520, CC2291, AIC3101)

James Lescohier
Prodigy 10 points

Other Parts Discussed in Thread: CC8520, TLV320AIC3101, CC2590

I am a fourth year electrical engineering student at RMIT University in  Melbourne, Australia. As part of our final year we are expected, like many other final year engineering students worldwide, to perform a research project  or design project.

My project involves wireless audio transmission at a higher bandwidth than  traditional techniques. While wireless audio transmission has been done to death, this "higher bandwidth" constraint requires me to demonstrate a deeper understanding of current technologies and their difference to previous ones.

Of note, is your PurePath Wireless Audio range of chips.  I am interested in  these chips and their application in the system I am designing.  From my  research, I have determined that you would require three different chips for a  basic system which takes analogue audio in from a pair of RCA jacks, converts  it to an RF signal, and transmits it at 2.4Ghz. This would require the TLV320AIC3101 codec chip for DAC, the CC8520 for the conversion to an RF signal, and the CC2291 as the RF amplifier.

Furthermore, is there a reference design/schematic available for me to use in  reports as an example of a whole and complete application of these (or  similar) chips? These designs would be correctly referenced. Is the CC85XXEM a reference design which would be considered accurate for this? What software does the associated files open with (I am used to Altium Summer '09)?

I have considered creating and demonstrating the PurePath Wireless Audio system as a whole.

  • What additional programming, if any, is required for these chips to operate? 
  • Is this software available freely online? 
  • Could it be possible to build this system on a single  layered board using axial resistors, inductors and capacitors, or will track inductance/capacitance create a large problem?  Is the layout too complicated for a single layer design? I am able to get multi-layered boards done if necessary, but this is an additional effort and cost when I already have facilities to create single layered ones. 
  • Are there any other design considerations which I have not mentioned here that I should be aware of?

Thank you very much for your time.

--James

 

  • 0
    TI__Expert 7160 points

    Hi James,

    A few comments and answers:

    On the transmitter side you use the ADC part of the TLV320AIC3101 to convert from analog to digital. On the receiver side you use the DAC part of TLV320AIC3101to convert from digital to analog. You mention CC2291 and I guess you mean CC2590 which is the range extender which is possible (not mandatory) to include. The CC2590 gives you a better link budget due to the increased sensitivity and output power that comes from the CC2590's LNA and PA respectively.

    Two reference designs with gerbers and schematics are available on TI's pages (not a complete application, but the RF part only):

    Without range extender CC2590: http://www.ti.com/litv/zip/swrc080a

    Range extender CC2590 included: http://www.ti.com/litv/zip/swrc185

    You can open the gerbers in Pentalogix Viewmate etc. (free)

    For a complete application you can have a look at our development kit (http://focus.ti.com/docs/toolsw/folders/print/cc85xxdk.html) and especially the User's guide for this kit which includes the schamatics of the PPW Audio Evaluation board. Theese boards have LINE IN/OUT RCA connectors, Headphone and Mic mini jack connector as well as coaxial and optical connectors for digital input and aout SPDIF signals.

    Comment on software: The CC85xx parts come with a built in protocol tailor made for audio streaming, menaing that the customer doesn't have to do any software development. However a PC tool has been made for configuration of the CC85xx devices. This is free and downloadable here: www.ti.com/ppwc. Here you can configure you CC85xx devices to be master or slave units and also stuff like how pairing should be enabled, the latency and sample rate in your network and a lot of other stuff. The configurations are then downloaded to the CC85xx chips with the CC Debugger (included in the development kit). It's also possible to run the CC85xx devices in socalled host controlled operation where you connect an external MCU via SPI for a more flexible application. You can read about this in the CC85xx Family User's Guide: http://focus.ti.com/lit/ug/swru250d/swru250d.pdf.

    We don't have a single layered reference design. It' extremely hard to do this with respect to power and grounding, the performance will be degraded. And also passing the different RF regulation requirements will be difficult. TI recommend to copy the above mentioned reference designs.

    Best regards

    Kristoffer

  • 0 in reply to Kristoffer S
    Prodigy 30 points

    hai

    The links you mentioned are not working or  expired. please renew them..i need them..