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Original question:

ADS131M02: If the ADS131M02 SPI signal have the internal pull in or pull down resistance?

ADS131M02: What is the input common-mode voltage when the ADC is a differential input?

Kevin Zeng
Intellectual 1340 points
Part Number: ADS131M02
Other Parts Discussed in Thread: ADS131M03

Hi Team,

Confirm one question:  What is the input common-mode voltage when the ADC is a differential input? Thanks.

  • 0
    TI__Mastermind 37955 points

    Hi Kevin,

    The ADS131M03 has an input range which is dependent on the PGA gain. Please see it in the following table on page 5 of the M02 datasheet.

    For the Gain=1, 2 and 4, the inputs can be anywhere from (AGND-1.3)V to AVDD. For a higher gain between 8 and 128, the internal pre-charge buffer limits the top end range. In both conditions, the input signal can be lower than AGND because of a negative charge pump that was designed on the ADC. The device uses a different type of PGA implementation from other ADCs.

    Regards,

    Dale