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ADS1013-Q1: About FSR

Koji Hayashi92
Mastermind 6970 points
Part Number: ADS1013-Q1

Hi HI-Team

In my recognition that FSR is fixed at ± 2.048 V regardless of the VDD voltage.
If it it correct, the error of the VDD voltage does not affect the error of AD conversion.
Is it correct ?

 

Best Regards,
Koji Hayashi

  • 0
    TI__Mastermind 20805 points

    Hi Hayashi-san,

    your understanding is correct.
    The ADS1013-Q1 only offers the +/-2.048V FSR setting and this FSR setting is independent of the supply voltage that is used.

    However changes in the supply voltage can in theory still affect the accuracy or resolution of the conversion result. On higher resolution ADCs we express this dependency usually as a PSRR specification. For ADS1013-Q1 we do not specify a PSRR because the effect is unnoticeable. Means the effect is much smaller than an LSB size.

    Regards,

  • 0 in reply to Joachim Wuerker
    Mastermind 6970 points

    Hi Joachim-san

    Thank you for quick response.

    I understand.

    Best Regards,

    Koji Hayashi