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DAC81408EVM: PWL waveform output from DAC

Koshi Ninomiya
Expert 5015 points

Part Number: DAC81408EVM

Dear Team,

My customer is considering to use the DAC71408 (14-bit), and has the DAC81408EVM and the USB2ANY now.
They want to ouput PWL (Piece-wise Linear) waveform from the DAC81408EVM.
For example, a PWL signal source of the PSPICE-for-TI.

Can the PWL data be input to the DACx Data Register for the PWL waveform output on the DAC81408EVM software?

I look forward to your reply.
Thank you.

Best Regards,

Koshi Ninomiya

  • 0
    TI__Expert 4120 points

    Hi Koshi,

     

    Yes, it's possible to provide input codes to DACx registers corresponding to a PWM output. 

    Can you the please some more details about the PWM frequency, DACx output update rates and output voltage requirements? 

     

    Thanks,

    Sanjay

  • 0 in reply to Sanjay
    TI__Expert 5015 points

    Hi Sanjay-san,

    My costomer wants to ouput PWL (Piece-wise Linear) waveform from the DAC81408EVM as follows,

    5V:0s=>5V:10us=>0V:12us=>0V:17us=>40V:19us=>40V:24us=>5V:26us=>5V:36us（Repeat）
    0V to 40V

    Best Regards,

    Koshi Ninomiya

  • +1 in reply to Koshi Ninomiya
    TI__Expert 4120 points

    Hi Koshi-san,

    This PWL waveform will not be possible with DAC81408 because of-

    1. slew rate for DAC81408 is only 4 V/us

    2. minimum wait for the sequential update for DACx voltage output is 2.4 us

     

    I would recommend to suggest the customer DAC80508 or DAC82002 device and use high voltage gain stage with OPA593 (it has very high 45 V/us slew rate).

    DAC80508 datasheet

    DAC82002 datasheet

    Let me know if you need any further assistant.

     

    Regards,

    Sanjay