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help to select a suitable DAC EVM product?

Hongwei Li98
Prodigy 165 points
Other Parts Discussed in Thread: DAC3484, DAC3482, DAC37J84, DAC37J82, FMC-DAC-ADAPTER, AFE7225

Hello there,

I am quite new to FPGA and DAC. I am current working a project requires random analog output (at least 2 channels) of 100MHz or more(+/- 1.0 range). I am planning to get a DAC EVM  that can work with Xilinx KC705 FPGA board. Could anyone can suggest me some suitable ones?

It will also be great if those boards start to output analog signals without too much effort on FPGA board. I saw there is TSW1400EVM. I am just wondering if TSW1400EVM can work with some DAC EVM to produce analog signal directly (with the provided software)?

Regards and thanks

Hongwei Li

  • 0
    TI__Genius 17290 points
    Hi Hongwei,

    Some DACs that may be of interest are DAC3482 and DAC3484 which both use LVDS interfaces. DAC37J82 and DAC37J84 may be of interest as well and utilize the newer JESD204B interface. All of these DACs are capable of 100 MHz outputs.

    The TSW1400EVM can be used to evaluate the LVDS DACs. You can upload your own signals to the TSW1400EVM for use with the DAC using our High Speed Data Converter Pro software. Otherwise, the FMC-DAC-Adapter can be used to interface the DAC3482 or DAC3484 to the Xilinx KC705 FPGA kit. Please check the FMC-DAC-Adapter, DAC EVM, and KC705 schematics to make sure that it is compatible.

    For the JESD204B DACs, the TSW14J56 can be used instead (TSW1400 will not work with the JESD204B DACs). High Speed Data Converter Pro is used with the TSW14J56 as well and the functionality is similar. Alternatively, the DAC37J82 and DAC37J84 can interface directly to the KC705 board through use of the FMC connectors on the board. The JESD204B IP will require a license from the FPGA vendors in order to compile firmware.

    Regards,
    Matt Guibord
  • 0 in reply to Matt Guibord
    Prodigy 165 points

    Hi Matt,

    Thanks very much for your detailed reply. That is very helpful for me. Additional questions about AFE7225, how fast it can do for analog output in reality and can it do both DAC and ADC at the same time? It seems the EVM has two functions separated and only one (either DAC or ADC depending on the port used) can be access at any time?

    Since we will need both DAC and ADC at the same time in the future (next step of our project), it will be nice to have some products (DACs or EVMs) to be capable of this. Any suggestions?

    Thanks

    Hongwei  Li

  • 0 in reply to Hongwei Li98
    TI__Genius 17290 points

    Hi Hongwei,

    The AFE7225 can output signals up to Fs/2 (125 MHz), but should realistically be limited to about 0.4*Fs (100 MHz) or less due to image filtering requirements - image sitting at 150 MHz near full power with 100 MHz output.  The part is capable of both DAC and ADC at the same time. As for the EVM, I suppose you could connect two TSW1400's to the EVM. I'll need to see if we have any experience with this. You could also look at getting a separate ADC EVM since this would require two TSW1400's in either case.

    Regards,
    Matt Guibord