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Looking for an EVM with ADC

Joseph CJ
Intellectual 425 points
Other Parts Discussed in Thread: OMAP-L138, OMAP-L137, ADS8361

Hi,

Are there any EVMs / Experimenters / Development boards with a DSP core (ideally 674x) and an ADC (>16 bits, >100k samples/sec)?

To me, TI store seems to be a little less user friendly when it comes to searching and finding one.

Thanks

Joe

  • 0
    TI__Intellectual 1910 points

    Joe,

    Can you please share a lttle bit about your application and what you're trying to do with the eval board and ADC?

    Regards,

    Loretta

  • 0 in reply to Loretta Faluade
    Intellectual 425 points

    Hi Loretta,

    We are trying to capture and extract information from our proprietary protocol / signal. Basically, onecan think of recovering a ~25kHz square wave that would be severely distorted and embedded with noise due to the communication channel.

    We already have OMAP-L137 EVM and OMAP-L138 experimenter. Therefore, an add on card could work as well.

    Hope that helps.

    Thanks

    Joe

  • 0 in reply to Joseph CJ
    TI__Genius 14545 points

    Joe -

    You might wish to check out the Audio Card extension for the OMAP-L137 from Spectrum Digital. It's got multi channel audio functionality and interfaces with the OMAP-L137 without glue logic.

  • 0 in reply to dabuan
    Intellectual 425 points

    Hi Drew,

    Thank you for your response.

    The codec that is in the adapter card is included in the OMAP-L138 experimenter. I did play with it briefly few months back and felt that using the builtin ADC for our application would be limited and not an optimal approach (correct me if I am wrong, but it appeared that controlling is done via I2C and data is exchanged via McASP, while we want to do everything via SPI). We are looking to eventually use ADS8361 (16 bit, 500 ksps) to cover a wide range of signals. Therefore, a development environment with an ADC that talks via SPI would be ideal.

    Thanks

    Joe

  • 0 in reply to Joseph CJ
    Intellectual 425 points

    I think I found a solution. I could get the following two

    http://focus.ti.com/lit/ug/slau094a/slau094a.pdf

    http://www.createnewstuff.com

    Make a custom ribbon cable and hook the ADC to OMAP-L138 experimenter. Will this work?

    Thanks

    Joe

  • 0 in reply to Joseph CJ
    TI__Genius 14545 points

    CJ,

       You are correct. The ADC is specifically for sub 20kHz signals using the McASP - and if you need anything higher for your proprietary protocol, it probably will not suffice. Reviewing your post, a square wave will obviously have frequencies >>20kHz.

    Just FYI. You might want to views the schematics to the breakout boards as the Spectrum Digital EVM does a lot of muxing based upon of cards are inserted or not. I have not used them myself, but have seen other posts where people may have had issues when using this solution.

  • 0 in reply to dabuan
    Intellectual 425 points

    Update: Got the ADS8361 EVM (16bit, 500ksps) and connected to the OMAP-L138 experimenter using the adapter from "createnewstuff" and a custom cable. Was successful with capturing analog signals and getting the data into the DSP.