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ADS1118: thermocouple temperature sensing from -50 degree to 200 degree C

Howard Zou
Genius 12365 points
Part Number: ADS1118
Other Parts Discussed in Thread: TIDA-00168, TIPD209, TIPD109

Hi, my customer need to measure the temperatue of the battery cell, and they need the temperature accuracy is at least 1°C at range of -50 to 200°C。They want to use T type thermocouple and cold junction compensation is needed.

I've searched some reference design below but it seems none of them 100% matches their need. The competitor is LTC2983 or AD595 from ADI.

Which solution do you think is best to promote?

http://www.ti.com/tool/TIDA-00168?keyMatch=thermocouple&tisearch=Search-EN-Everything

http://www.ti.com/tool/TIPD109?keyMatch=thermocouple&tisearch=Search-EN-Everything

http://www.ti.com/tool/TIPD209?keyMatch=thermocouple&tisearch=Search-EN-Everything

  • 0
    TI__Guru* 92655 points

    Howard,


    What you promote depends a bit about what your customer needs. The competitors that you list are the LTC2983 and the AD595. The LTC2983 is basically an ADC with some linearization to read the data directly to some proportion to temperature. The AD595 is an instrumentation amplifier that can apply the cold-junction compensation to the measurement, but does not have an ADC.

    TIDA-00168 seems a bit more than what your customer needs and has a noise floor of about 0.02°C. The accuracy can be calibrated to a number similar to that. TIPD209 is similar to the AD595 in that you can combine the instrumentation amplifier with a cold -junction compensation. TIPD209 also doesn't have an ADC in the design.

    I think that TIPD109 is probably the best fit. The accuracy is similar to what you're looking for (< 1°C) it is a rather simple solution. There isn't any circuit linearization but the reference design shows how the thermocouple measurement is calculated from a lookup table.


    Joseph Wu