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DAC9881: gain bandwidth product of the output buffer

Intellectual 910 points

Replies: 4

Views: 125

Part Number: DAC9881

Hi team,

My customer is looking at the DAC9881 to drive the REF pin of the INA819.

They would like to know if the On-Chip output buffer would be able to drive this pin.

For this, they are requesting the gain bandwidth product of the output buffer.

Could you please share this value?

Also, do you have any suggestion on their use case?

Thanks for your support.

Pol

  • Pol,

    Do you know any details around how the INA819 is being used? What are the input signals etc?

    Please note with the holiday season upcoming in the US and end of the year time-bank world-wide, responses may be delayed on this topic.

    Kevin Duke, MGTS
    ADC Product Marketing Engineer

  • In reply to Kevin Duke:

    Hi Kevin,

    Please find below the configuration of the INA819:
    - INA819 power supplies : +/-15V
    - Gain = 80
    - Common mode voltage input : 5V
    - Input signal : +/- 32mV with frequency up to 500 kHz
    - Vout DAC9881 = betweem 1.5V and 3.5V

    Thanks for your help.

    Pol
  • In reply to Pol REYMOND:

    Pol,

    I do not think this will be a problem, but we can double check with the design resources. Once again, though, with the holiday the reply may be delayed especially as we bring in more resources to get this closed.

    Kevin Duke, MGTS
    ADC Product Marketing Engineer

  • In reply to Kevin Duke:

    Hi Pol,

    The GBW product of the internal buffer of DAC9881 is 5.5-MHz typical.

    Hope that answers your question.

    Regards,
    Uttam Sahu
    Applications Engineer, Precision DACs

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