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ADC07D1520: Application of real-time streaming evaluation board questions

Chien-wei Tseng
Prodigy 10 points
Part Number: ADC07D1520


I have looked at the document. But I am not sure whether it can use as real-time streaming. Is the "Acquisition Size" described in the document as real-time streaming?

Acquisition Size - This setting displays and selects the number of samples captured in each acquisition. 4K samples is the default, with settings up to 32K samples. A larger sample size increases the equivalent FFT bandwidth resolution, but at the expense of more memory and slower acquisition time.

Per my understanding, the device will display every 4k/32k samples FFT result or just one-shot 4k/32k samples FFT results? If this is doing every 4k/32k samples, what is the updating rate that doing the FFT? 

Thank you!

  • 0
    TI__Guru* 80065 points

    Hi,

    The acquisition size is the amount of data being captured by the FPGA + ADC capture card (i.e. wavevision). It has nothing to do with the inherent capability of the ADC. This simply means that each time the FPGA capture, it capture 4k of sample, and then process in the FFT for display through the Wavevision software.

    The update rate will be limited by the data bus captured within the FPGA + additional overhead in the Python processing for FFT + USB data transfer rate. This is very hard to comment as this is mainly dominant by the PC speed and USB transfer rate. 

    -Kang