AD719x reference buffer amplifier?

Hi all,

what is a suitable amplifier to be used as a reference buffer for a AD719x (AD7190, AD7192)?

Since the reference input of the AD719x draws rather high peak currents, it has to be an amplifier with a quick settling after going out of regulation, correct?

Therefore I'm asking for a proven amplifier.

TIA,

Oliver

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  • 0
    •  Analog Employees 
    on Jun 28, 2016 2:01 AM

    Hi Oliver,

         When using the ADR431 as reference to the AD7190, it is okay not to use buffer as the ADR431 is able to drive the AD7190 as the average current in the reference is about 7uA/V. Now when not using the ADR431, it can be consider to use buffer. We haven't use buffer yet for the AD7190 reference but some of the SAR ADC uses the AD8031 and ADA4841. This buffers already proven to work with the PulSAR ADCs. These buffers have low output impedance at lower frequencies and are low noise.

    Regards,

    Jonathan

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  • 0
    •  Analog Employees 
    on Jun 28, 2016 2:01 AM

    Hi Oliver,

         When using the ADR431 as reference to the AD7190, it is okay not to use buffer as the ADR431 is able to drive the AD7190 as the average current in the reference is about 7uA/V. Now when not using the ADR431, it can be consider to use buffer. We haven't use buffer yet for the AD7190 reference but some of the SAR ADC uses the AD8031 and ADA4841. This buffers already proven to work with the PulSAR ADCs. These buffers have low output impedance at lower frequencies and are low noise.

    Regards,

    Jonathan

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