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TMS320F280039C: Thermal compensation for ADC?

Wayne Huang
Genius 16805 points

Part Number: TMS320F280039C

Dear Champs,

I am asking this for our customers.

In the datasheet,

6.13.3.2.2 ADC Characteristics

1. All these spec are tested under -40 to 125C Ta (free-air) within supply voltage range based on 6.4 Recommended Operating Conditions. Is it right?

2. If the user can accept the specified max errors like offset errors and gain errors, they do not need to do any further thermal compensation to calibrate gain/offset at different temperature points.

Is my understanding correct?

3. If the user wants better accuracy at different temperature points, they may do further thermal compensation to calibrate gain/offset at different temperature points by a look-up-table and interpolation based calibration.

Is my understanding correct?

Wayne Huang

  • 0
    TI__Guru* 82840 points

    Wayne,

    I've assigned your post to the subject matter expert, but due to US Holiday, please expect our response by the end of day Monday.

    Best,

    Matthew

  • +1
    TI__Mastermind 40140 points

    Hi Wayne,

    Please see responses below:

    Wayne Huang said:
    1. All these spec are tested under -40 to 125C Ta (free-air) within supply voltage range based on 6.4 Recommended Operating Conditions. Is it right?

    -  Yes, that is correct.

    Wayne Huang said:
    2. If the user can accept the specified max errors like offset errors and gain errors, they do not need to do any further thermal compensation to calibrate gain/offset at different temperature points.

    - Yes, that is correct.

    Wayne Huang said:
    3. If the user wants better accuracy at different temperature points, they may do further thermal compensation to calibrate gain/offset at different temperature points by a look-up-table and interpolation based calibration.

    - F280039C ADC does not support thermal compensation for gain and offset.  Production testing covers calibration for the operating temperature/voltage range, and these calibration values are set at factory.  If user desires to do calibration for instance and override the set factory values(example: adc offset calibration as described in the TRM), the derived calibration value would only work best at the specific temperature/voltage corner where user calibration is done.  

    Best regards,

    Joseph