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AD7663

Hello,

I have a customer that would like to know the pluses/minuses of using a Vref 2.5V versus the 4.096V reference for the AD7663. I saw that the datasheet has performance characteristics for the 4.096V Vref, but not for the 2.5V. Have you done evaluation with both? Can you share your results? Any opinion on advantages, disadvantages would be great. i.e. performance over temperature, stability over time etc.

Thank you,

Anita

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  • Hi,

    AD7663 uses an external Vref and is specified to a minimum of  2.3V and max up to (AVDD - 1.85.), so we can't use the 4.096V reference voltage. Please note AD7663 has a dynamic input impedance therefore should be  driven by low impedance source with efficient  decoupling between REF and REFGND inputs.

    It's recommended to use the amplifier as this conditions the input signal—as well as acting as a low-impedance buffer between the signal source and the ADC input. Please see page14 of the datasheet for different driver amplifier choice and page13 for the typical connection diagram.

    regards,

    LLoben

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  • Hi,

    AD7663 uses an external Vref and is specified to a minimum of  2.3V and max up to (AVDD - 1.85.), so we can't use the 4.096V reference voltage. Please note AD7663 has a dynamic input impedance therefore should be  driven by low impedance source with efficient  decoupling between REF and REFGND inputs.

    It's recommended to use the amplifier as this conditions the input signal—as well as acting as a low-impedance buffer between the signal source and the ADC input. Please see page14 of the datasheet for different driver amplifier choice and page13 for the typical connection diagram.

    regards,

    LLoben

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