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SDR Receiver - [relatively] cheap

Alan Campbell
Prodigy 40 points
Other Parts Discussed in Thread: DAC3482, ADS4249

I've been looking at options for Software Radio (SDR). Specifically, receivers that cover HF (with the option to extend into VHF etc at a later date). To that end, I was looking at FPGA cards, and ADC FPGA Mezzanine Cards (FMC).

I found the TI FMC adaptor card. But then, while researching a dual-channel 250MSPS ADC (ADS62P49EVM) I noticed a surprisingly cheap FPGA card, which does NOT use the FMC adaptor: TSW1405EVM. Combined with the ADC, this should form the backbone of a receiver handling 100 MHz or more, depending on oversampling etc.

Am I missing something? Is this combination not valid, or is the FPGA in the TSW1405 not capable of being re-programmed to perform DDC ? Basically, should I buy my whole setup from you guys, or look for an FPGA with FMC connector elsewhere?

[Edit] The page for the adaptor card suggests any questions be posted to the "High Speed Converters" forum. Although I'm talking about RF design, this may be the wrong place to post. Sorry !

 

  • 0
    TI__Genius 12965 points

    Hi Alan,

    The TSW1405 is based on the Lattice ECP3 FPGA - its low cost, but has high speed LVDS interfaces capable of running at 1Gsps.  We chose this for our low cost eval platform.  It only has internal memory and can support 64ksamples of 16b.  This may be a limitation to you.

    We also have the TSW1400 (full featured) eval platform which is based on Stratix IV and has a SODIMM memory to handle up to 512Msamples at 16b.

    You can use either of these for development purposes if they suit your needs - Lattice will support the TSW1405 if you have any questions about making modifications to the FPGA code.  We have published an appnote on using the Stratix IV on the TSW1400 with an ADC and a DAC.  These eval boards will natively connect with our ADC EVMs and do not require any adapters.  If you use an FMC based platform you will need to get the FMC adapters.

    Here is the appnote outlining how to connect the TSW1400 Stratix IV to an ADS4249 and a DAC3482 EVM (Project Files included).

    http://www.ti.com/analog/docs/litabsmultiplefilelist.tsp?literatureNumber=slaa545&docCategoryId=1&familyId=2020

    Ken