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PCM2900C: Industrial temperature range.

Andreas T
Prodigy 30 points
Part Number: PCM2900C

Hi, 

I am designing a USB to Stereo audio module and would like to use one of the ICs in the PCM290xC family. 

The design shall be industrial temp (-40*C to 85*C).

Is there any known problems when going below -25*C? 

Is it ok to cold start the device at -40*C and use the device as normal when the temperature reaches -25*C?

Can you provide any test results from -25*C to -40*C or any information about performance? 

Thank you!

  • +1
    TI__Mastermind 29375 points

    Hello Andreas,

    Welcome to E2E and thank you for reaching out.

    The datasheet provides two temperature ranges that I believe answer your question.

    The first can be found in the "packaging/ordering information" table (note that in other TI datasheets this may be referred to as "Recommended Operating Conditions"). The Specified Temperature Range column shows a range of -25 to 85C range. As long as the device is operated within this range, the device should operate within the minimum and maximum values listed in the Electrical Characteristics tables throughout the datasheet.

    The second zone is the Absolute Maximum Ratings. If the device is within the Abs. Max. temperature range (-40 to 125C) but outside of the Specified Temperature Range the device may not operate as specified. However, the device is expected to recover when returned to recommended operating conditions. However, conditions outside of the Abs. Max. range may cause permanent damage to the device.

    As a result, it should be okay to "cold start the device at -40*C and use the device as normal when the temperature reaches -25*C". 

    With regards to test results, the information listed in the datasheet (electrical characteristics tables) are the test results of device characterization. I am unable to share further characterization data outside of what is provided in the datasheet's tables. 

    Hopefully this answers your question.

    Best,
    Andrew

  • 0 in reply to Andrew J
    Prodigy 30 points

    Thank you for clarifying! 

    Would it be possible to get some more test results and information outside the datasheet if we sign an NDA? 

  • 0 in reply to Andreas T
    TI__Mastermind 29375 points

    Hi Andreas,

    It is possible to get more information if you have an NDA, however, the datasheet specs are very thorough. Based on your explanation, the device is only operated within the recommended operation conditions (and the Abs. Max. conditions are not violated) then it parameters specified in the datasheet won't be outside of the min-max range.

    Best,
    Andrew

  • 0 in reply to Andrew J
    Prodigy 30 points

    Worse audio quality is not a concern between -40*C and-25*C, but if there are some known errors like random shut downs or audio cut off we would like to sign an NDA. 

  • +1 in reply to Andreas T
    TI__Mastermind 29375 points

    Since the -40 to -25C range is out of the recommended operating conditions there are no guarantees on performance. 

    Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

    Essentially, the device may work in this range, but there is no test data since The Abs. Max. Limits are intended to be used as an indication of when the device would incur physical damage (package deforming from cold or heat) and not be able to recover. 

    Because of this, the operation of the device in these temperature range should be considered as a "storage temperature" and there is no data on performance outside of the range listed in the recommended conditions.

    I hope this helps.

    Best,
    Andrew

  • 0 in reply to Andrew J
    Prodigy 30 points

    It is more clear now, thank you!