• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 10 subscribers
  • Views 109 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

DAC38RF83: DAC Temperature

Daniel Malouin
Prodigy 20 points
Part Number: DAC38RF83

Tool/software:

I find the temperature reading low for a junction temperature. When I query the DAC38RF83 register 0x06, the TEMPDATA field returns a value around 42C. Is it normal that the temperature is so low when the DAC transmits? Do I need to apply an equation to get the true temperature in Celsius? I take this measurement in a controlled environment at 20C. Thank you!

  • 0
    TI__Guru 71959 points

    Hi Daniel,

    The temperature sensor is measuring the junction temperature. You can estimate the junction temperature through the following variables. 

    Refer to the app note in note (1) for detail

  • 0 in reply to Kang Hsia
    Prodigy 20 points

    Hello Kang,

    Register 0x06 (TEMPDATA) gives a result of 22C at the power-up of the unit and 42C after a few minutes and remains at this value whether the DAC transmits or not. Does this value correspond to Tj? In this case and according to the documentation Tj = Ta + (Roja x Power) where Roja equals 25C/W. I want to know if this is a normal behavior for temperature as I would have expected large variation when the DAC is in operation or not?