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ADS1278EVM USB throughput too slow

Gerson de Souza Faria
Prodigy 20 points
Other Parts Discussed in Thread: ADS1278EVM-PDK, ADS1278

Dear community,

Using the great ADS1278EVM-PDK in Windows XP, I observed that the transfer rate of an acquisition of 1 million points x 4 channels was very slow. By my counts, it is ~50 kilobytes per second (it takes 10 minutes to transfer a .txt of ~33 Mbytes).

Any ideas?

  • 0
    TI__Guru 66186 points
    Hello Gerson,

    Thank you for evaluating our ADS1278!

    The USB throughput on the MMB0 motherboard is not something that we test or characterize for any of our EVM platforms. I can assure you that the points are still contiguous and collected at the expected output data rate from all channels. Once the data is collected, it is transferred to the PC through the USB port, but the speed of the USB transfer is not dependent on the ADS1278.

    That said, our EVMs are not intended to be used as real-time data monitors. It may be more useful to you to collect smaller sample sizes in order to characterize the device's performance.

    Best Regards,
  • 0 in reply to Ryan Andrews
    Prodigy 20 points

    Dear Ryan,

    Thank you for your response. The A/D conversor is my choice, comparing it with, for instance, Maxim's and Linear's equivalents.

    I fully understand that the EVM is not intended to be used as a real-time device. I did not purchase it by thinking it was.

    The fact is that the throughput is hundreds of times below what is considered a natural, a normal USB speed. Even considering decades old USB 1.0,

    that has 1~10 Mbit/s of speed. Since there's buffer memory enough and a high speed DSP in the MMB0 in order to capture the data points at the rate of

    choice, I think that this low transfer speed is a drawback, something unnatural, easily improvable. But this is only a feedback.

    Regards,

    Gerson

  • 0 in reply to Gerson de Souza Faria
    TI__Guru 66186 points
    Hi Gerson,

    Thank you for the feedback. We will certainly keep in this mind for future EVM platforms.

    Best Regards,