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ads1231 capacitors

theodore belogiannis
Intellectual 420 points
Other Parts Discussed in Thread: ADS1231, ADS1131

Hi there,

I use the ADS1231-1131 in a battery powered application (4xAAbatteries = 4,5V) in a ratiometric wiring.

During measurements there are no voltage peaks or noise. So I decide to no to use a seperate chip for voltage reference. My tests are succesfull so I will move with this scenario. What is your opinion ?

Also, I have decoupling for AVDD and DVDD 1uF, and 100pF for E+ and E-. I'm not sure whether the differential cap is mandatory. Again at the experiment board I don't face any problem.

BR
Theodore

  • 0
    TI__Guru** 113765 points

    Hi Theodore,

    The nominal voltage for AA alkaline batteries is 1.5V, and using 4 batteries would be 6V.  Be careful about this operation as 6V is the absolute maximum voltage the device can operate.  If using a rechargeable battery the voltage output is less, so if this what you are using that should be fine.

    If the excitation voltage and the reference voltage are the same, then the measurement will be ratiometric and the result should show the same response as the battery degrades.  You do not need to use a regulated voltage.

    I assume the differential cap you are referring to is the analog input cap.  You may find that this cap is beneficial for antialiasing reasons for reducing noise.  This will be more evident with the ADS1231 over the ADS1131.

    Best regards,

    Bob B