AD9689 External Voltage Reference

I'm just wondering on these high speed ADC's (AD9689) it has an internal voltage reference but says you can use a "better" external voltage reference "to increase gain accuracy or improve thermal drift characteristics".  Is there any kind of guidance or quantification on the improvement or can you please describe how the improvement impacts the performance.

Thanks,

Jon

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    •  Analog Employees 
    on Jun 6, 2018 4:14 AM

    Hi Jon,

    I would not characterize the external reference necessarily as "better". However, in some applications customers express concerns about the drift in the internal references of multiple ADCs (in this case, multiple AD9689s). They feel it is necessary to use an external reference with "better" thermal drift characteristics than that offered by the internal reference of the AD9689. In such situations, we have a tried and tested solution in the ADR130. 

    Thanks

    Umesh

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  • 0
    •  Analog Employees 
    on Jun 6, 2018 4:14 AM

    Hi Jon,

    I would not characterize the external reference necessarily as "better". However, in some applications customers express concerns about the drift in the internal references of multiple ADCs (in this case, multiple AD9689s). They feel it is necessary to use an external reference with "better" thermal drift characteristics than that offered by the internal reference of the AD9689. In such situations, we have a tried and tested solution in the ADR130. 

    Thanks

    Umesh

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