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Original question:

ADS124S08: Thermopile Used with ADC

ADS124S08: Universal sensor reading

osman
Prodigy 30 points
Part Number: ADS124S08
Other Parts Discussed in Thread: ADS125H02, ADS1261, , ADS1262

Hi.

I want to develop a data acquisition device (DAQ).

The quantities I want to measure are as follows:

1) RTD (2/3/4 wires)

2)Thermocouples

3) 0-20ma/4-20ma current

4) Voltages(eg. 0-1V, 0-10 etc)

My goal is to be able to use each of these measurements optionally. So the user can connect current, voltage, RTD, or thermocouple. So the inputs need to be universal. As a result of my research, I came across chips such as ADS1261, ads124s08, and ads125h02. Do you think these are the right products? Is there another chip you can recommend? 

  • 0
    TI__Guru** 113765 points

    Hi osman,

    Welcome to the E2E forum!  Any of these devices will work for you, but the ADS125H02 will require some additional circuitry and lacks IDAC current sources for the RTD measurement.  The advantage of using the ADS125H02 would be the direct voltage connection to the input whereas the other 2 devices would require a voltage divider for the 0 to 10V measurement.

    There is yet another device, the ADS1262 which has a reference design very similar to the measurements you wish to make.  The reference design is https://www.ti.com/tool/TIDA-00550 and either the ADS1261 or the ADS124S08 would work as a replacement device for this design.

    As to which device to use is up to you relative to device cost, measurement resolution and speed of acquisition.  I would look first at the ADS124S08 to see if it will meet your requirements.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 30 points

    Thanks, Bob.

    What is the difference between ADS1261 and ADS124S08?

  • 0 in reply to osman
    TI__Guru** 113765 points

    Hi osman,

    You probably should do a datasheet comparison.  Both devices are similar in overall function, but the ADS1261 has faster conversion rates, lower noise and as a result uses higher power.

    Best regards,

    Bob B