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ADS1261: Is there a maximum limit on what my transducer bridge frequency can be for implementing AC bridge chopping using ADCs such as ADS1261?

A BC
Prodigy 90 points
Part Number: ADS1261

I could not find any discussion regarding what the frequency with which the measurement quantity is changing (i.e. the transducer bandwidth) can be with respect to the AC excitation frequency in the datasheet. If the signal value changes within a few cycles of the AC excitation will this affect the measurement accuracy?

  • 0
    TI__Mastermind 35141 points

    Hi A BC,

    To be clear, the AC excitation feature described in the ADS1261 does not actually provide an AC signal to excite the bridge. Instead, the ADS1261 provides control signals to control external switches to change the polarity of the excitation voltage.

    Therefore, there is no "AC excitation frequency" per se, other than the frequency at which the control signals change (which are effectively just GPIO pins toggling low to high, etc.).

    The actual ADC digital filter bandwidth and conversion latency are described in Tables 6 and 8 in the datasheet, respectively, if you need to correlate these values to the transducer BW

    -Bryan