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ADS131M08-Q1: Increasing FSR

Tanner Songkakul
Prodigy 10 points
Part Number: ADS131M08-Q1
Other Parts Discussed in Thread: ADS131M08

Hello,

We are trying to achieve a wider FSR with the ADS131M08-Q1.  We see that in the datasheet, the maximum recommended voltage for REFIN is 1.3V, though the pin is rated to AVVD + 0.3V. What is the expected behavior and risks of connecting AVDD (in the 3V range) to REFIN in order to increase the FSR?

  • +1
    TI__Mastermind 41861 points

    Hi Tanner Songkakul,

    The ADS131M08 is designed to operate with a reference voltage of 1.1V to 1.3V, as specified in the datasheet. This is true whether you use the internal VREF or an externally applied voltage.

    If you operate the device outside of these limits, or any other limits that are specified in the datasheet, the device performance is no longer guaranteed. In other words, all bets are off.

    I would not recommend operating the ADS131M08 in this manner, and I hope it is clear that if you choose to violate the datasheet specifications you do so at your own risk

    -Bryan