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Using a DAC over McBSP

Kyle Aven
Intellectual 950 points

Other Parts Discussed in Thread: DM3730, DAC8562, DAC8563, DAC8832, DAC8831, DAC8830, DAC8871

Hello,

I was wondering if anyone on here could suggest a DAC that can be used via a McBSP port on the DM3730. The design calls for 1-2 channels, min. of 16-Bit, and output rate of at least 300kSPS/per channel. Any help would be greatly appreciated.

thanks

kyle

  • 0
    TI__Expert 3260 points

    Hi Kyle,

    I apologize for the delayed response. We are looking into a possible list of devices, that may suit your purpose. Meanwhile, if there are any additional requirements for your design (specifications, end application, or any other additional information you might be willing to share), please inform us of them, and we'll take them into consideration.

  • 0 in reply to Michael W
    Intellectual 950 points

    No problem with the delay, i know yall are busy. Only other info i think would be important is that this will be a handheld device, so power draw will need to be taken into account. But from looking through the majority of TI's D2A's, i dont think that section of the design will be an issue as far as power is concerned. We will be using the D2A to generate a sine sweep which will be amplified and used to drive a piezo. We are currently trying to decide between using McBSP or SPI to interface with the D2A, so i was just wondering what the options would be.

     

    thanks

    kyle

  • 0 in reply to Kyle Aven
    TI__Mastermind 46290 points

    Hi Kyle,

    You might look at the DAC8562 or DAC8563. These are among our lower power DACs and these feature internal references to keep the required surrounding circuitry to a minimum for your handheld device. Both of these are 2 channel DACs. I think these might also be some of the easier devices to integrate with the McBSP interface.

    I'm not an expert with the controller you mentioned - but I think the McBSP peripheral should be capable of being compatible with many regular SPI interfaces in TDM mode. Our EVMs use the McBSP port of the C5507 in this way and the peripherals are likely similar. You also mentioned the SPI port being a possibility. To this end you may also want to consider the DAC8830, DAC8831, DAC8832, and DAC8871.

    All of these devices have solid INL/DNL specs, low settling time, and are low power devices. You've got a whole lot of options available to you from our portfolio, so if these are not appealing for one reason or the other let us know and we can refine our suggestions.

  • 0 in reply to Kevin Duke
    Intellectual 950 points

    Kevin,

    Thank you for your reply. I see in figure 98 of the DAC8562 that McBSP is pretty simple to implement. I will look over these options and make a decision. Thanks. Now i guess its time to bug you analog department about driving high capacitive loads and your power department about eff. +/-30V rails  :)

     

    thanks again

    Kyle