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ADS9224R: Can an external voltage reference be used?

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Replies: 4

Views: 106

Part Number: ADS9224R

The fact that the internal reference and reference buffers can be powered down tends to indicate that an external reference can be used. However, the data sheet only describes operating the part with the internal reference.

  • Hi Brad,

    Thank you for your post and welcome to our forum. 

    I agree the data sheet is a bit unclear. It describes the REFP_x and REFN_x pins as "positive/negative reference input for ADC x". Yet, these pins are listed as "Analog outputs" only.

    Please allow me to confirm the intended operation of the reference pins with the team.

    Best regards,


    Ryan Andrews

    Applications Engineer | Precision ADCs 

    Are you working on a bio-potential application? Check out these helpful resources: ADS129x BIOFAQ | ECG Online Training

  • In reply to Ryan Andrews:

    Hi Brad,

    The ADS9224R does not support an external reference voltage. 

    Do you prefer to use an external reference? Is it because you're interested in higher performance?

    Best regards,


    Ryan Andrews

    Applications Engineer | Precision ADCs 

    Are you working on a bio-potential application? Check out these helpful resources: ADS129x BIOFAQ | ECG Online Training

  • In reply to Ryan Andrews:

    High accuracy and low long term and over temperature drift are required, so an external reference is preferred. 

    Any suggestions for an alternate part?

  • In reply to Brad Boudreaux1:

    Hi Brad,

    I will contact you offline about alternatives.

    Best regards,


    Ryan Andrews

    Applications Engineer | Precision ADCs 

    Are you working on a bio-potential application? Check out these helpful resources: ADS129x BIOFAQ | ECG Online Training

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