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ADS1248: Internal Temperature Sensor

Xaver
Expert 8165 points
Part Number: ADS1248
Other Parts Discussed in Thread: ADS1220,

Hi all,

the output voltage of the internal temperature sensor is typical 118mV @ 25°C. What is the min. and max. output voltage at 25°C?

Thanks a lot!

Best regards, Xaver

  • 0
    TI__Guru** 113765 points
    Hi Xaver,

    Unfortunately the ADS1248 only has the typical value and has no guaranteed performance. The ADS1248 is a course measurement only and is not factory trimmed for performance. This differs from devices such as the ADS1220 which has trimmed temperature sensor.

    Best regards,
    Bob B
  • 0 in reply to Bob Benjamin
    TI__Expert 8165 points
    Hi Bob,
    thanks a lot for your quick response. The target is to achieve an accuracy of 2 Kelvin from 0°C to 80°C. Is it possible to get this value with a calibration of the output voltage at 25°C? The typical value for the temperature coefficient is 405uV/°C but there is also no min/max values mentioned in the datasheet.

    Best regards, Xaver
  • 0 in reply to Xaver
    TI__Guru** 113765 points

    Hi Xaver,

    It is possible to calibrate but this would have to be done for each device as there will be device to device variation as well as lot to lot variation.  This variation could be in the range of 3 to 6 deg C.  Also, the temperature is the die temperature.  There could be some variation relative to ambient or board temperature with respect to die temperature. 

    You would need at least 2 known points for calibration to determine the coefficient.  So a single measurement at 25 deg C will only give you a voltage at 25 deg C.  The second point measurement would give you the value for the slope of the difference between the two temperatures.

    Coefficient = (Vtemp2 - Vtemp1)/(Temp2 - Temp1)

    Best regards,

    Bob B