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ADS1282-SP: FSR Formula

Renan Santos Adriano
Genius 16540 points
Part Number: ADS1282-SP

Hello Team,

My customer would like to confirm for the part number ADS1282-SP, the datasheet indicates INL(Integral Non-Linearity)=0.017%FSR, where FSR is defined as +/- VREF/2*PGA.

They are wondering if the FSR formula can be applied to a case where the AVDD=5V and AVSS=GND.

Regards,

Renan

  • 0
    TI__Mastermind 24940 points

    Hello Renan,

    Yes, AVSS can be set to ground (0V). All parameter in the datasheet will apply with AVSS set to 0V.

    Regards

    Cynthia

  • 0 in reply to Cynthia
    TI__Mastermind 44550 points

    Hi Renan,

    To add to Cynthia's comment, the input signal to the internal PGA needs to abide by the FSR formula (as you cannot measure differential signals greater than +FS or less than -FS) as well as the input operating range of the PGA, given by equation 2:

    AVSS + 0.7 V < (AINN or AINP) < AVDD – 1.25 V

    The FSR is determined by the reference voltage and PGA gain (limiting the max differential voltage you can apply); however, the supplies voltages will also place a limit on the absolute input voltages that can be applied to the PGA.

    I hope that answers your question!