AD7091R-4 offset

Hello

Could you give me your advice about value of offset error of AD7091R-4 ?

Datasheet says +-1.5mV offset error at internal reference.

What is value of offset error at  5V external reference ?

As the result of test, offset error is about 1LSB at 2.5V external reference on evaluation board.

But offset error is about ~6LSB at 5V external reference on evalaution board.

(External power supply unit is used as reference).

Please let me know your advice

Regards,

Terumasa

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  • 0
    •  Analog Employees 
    on Feb 3, 2015 12:10 AM

    Hi, Terumasa.

    Let me check on this. Meanwhile, can you provide the configuration of the relevant links on your test? What did you use for 2.5V external reference? Also what external power supply unit was it that you used? We don't usually recommend using power supplies as reference.

    Regards,

    Karen

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  • 0
    •  Analog Employees 
    on Feb 3, 2015 12:10 AM

    Hi, Terumasa.

    Let me check on this. Meanwhile, can you provide the configuration of the relevant links on your test? What did you use for 2.5V external reference? Also what external power supply unit was it that you used? We don't usually recommend using power supplies as reference.

    Regards,

    Karen

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