• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 117 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Maximum Output Update Rate of DAC81416 (1 Channel vs 16 Channels)

Lex Starling
Prodigy 10 points
Part Number: DAC81416

Tool/software:

Hello,

I would like to know what is the maximum output voltage update frequency (settling rate) of the DAC81416. Specifically:

  • What is the maximum update rate when only 1 channel is actively updated?

  • What is the update rate when all 16 channels are updated simultaneously or sequentially?

Any details on the settling time, SPI interface limitations, or other factors affecting the update speed would be greatly appreciated.

Thank you!

  • 0
    TI__Expert 5080 points

    Hi Lex,

    Please check the 7.6 Timing Requirements section. 

    • What is the maximum update rate when only 1 channel is actively updated?

      • wait time between two code updates is 2.4us minimum. 

    • What is the update rate when all 16 channels are updated simultaneously or sequentially?

      • wait time between two code updates is 4.0 us minimum.

    Here the wait time defines as the diagram below - 

    Now the update rate can derived from the equitation below - 

    Update rate  = 1 / (wait time + time from the CSz fall edge to CSz rise edge)

    Even though the settling time is 12us, DAC can be updated with faster update rates. Output will change but it wouldn't be settled.



    Thanks,
    Sanjay

  • 0 in reply to Sanjay
    Prodigy 10 points

    Thanks a lot, Sanjay