AD7927 VDRIVE-restriction

What’s the secret about the restriction in the abs. max. ratings of AD7927: “VDRIVE to AGND must be −0.3V to AVDD + 0.3V” and what happens if you don’t take care, e.g. if VDRIVE is powered up before AVDD? Could this damage the ADC?

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    •  Analog Employees 
    on Jul 24, 2017 1:52 AM

    Hi matno2,

       The Abs max rating table has an implicit way to properly power up the AD7927. The "VDRIVE to AGND must be −0.3V to AVDD + 0.3V” means that the AVDD must be power up first before Vdrive, this sequence must be follow to properly operate the part. Powering the Vdrive first prior AVdd, the performance of the part cannot be guarantee and there is a high chance that the  part might be damage. It is always recommended to follow the abs ,max rating.

    Regards,

    Jonathan

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  • 0
    •  Analog Employees 
    on Jul 24, 2017 1:52 AM

    Hi matno2,

       The Abs max rating table has an implicit way to properly power up the AD7927. The "VDRIVE to AGND must be −0.3V to AVDD + 0.3V” means that the AVDD must be power up first before Vdrive, this sequence must be follow to properly operate the part. Powering the Vdrive first prior AVdd, the performance of the part cannot be guarantee and there is a high chance that the  part might be damage. It is always recommended to follow the abs ,max rating.

    Regards,

    Jonathan

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