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LM95235 used with ADC12D1600RF

TIguru
Expert 1430 points
Other Parts Discussed in Thread: LM95235, ADC12D1600RF, LM95233

Hi,

   When using an LM95235 for measuring the temperature on ADC12D1600RF,  which mode do I select to get the most accurate temperature readings on my High Speed ADC?

From the datasheet:

"0: Selects Diode Model 2, MMBT3904, with TruTherm technology
disabled.
1: Selects Diode Model 1, A typical Intel Processor, with 65 nm or 90
nm technology, and TruTherm technology enabled."

Based on the above, do I select mode 0 with TruTherm disabled, or mode 1?

Please advise.  In advance, thank you for your feedback.

TG

  • 0
    TI__Mastermind 44490 points

    Hi TG

    The ADC12D1600RFRB (reference board) uses the LM95233 remote diode temperature sensor, which is very similar to the LM95235. In that platform, the ADC thermal monitoring diode is connected to the Remote Diode 1 terminals of the LM95233 and that input is configured in the default mode with "TruTherm BJT beta compensation technology enabled (Ex: Intel 65 nm technology)". When monitoring the ADC temperature in that platform we see believable temperature values , but have not extensively characterized the measurement accuracy of this monitoring method.

    I would recommend starting with the LM95235 configured for Diode Model 1, and TruTherm enabled. The best "room temperature" baseline measurement will be achieved by powering the ADC12D1600RF, but setting the device in Power Down mode to minimize internal power dissipation. You can also try Diode Model 2 for comparison of baseline temperature values for best accuracy.

    I hope this is helpful. Please let us know if you have additional questions.

    Best regards,

    Jim B