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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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  • Thanks, jcolao,

    the meaning of the AMRs is quite clear to me. I want to find out what really happens in case of violating this restriction. In the AN_932 I found some explanation for the other restrictions but not to this one. Why is this dependancy between digital and analog voltage?

    https://ez.analog.com/thread/96902 mentions for the AD7266, which has a similar restriction: "If Vdrive goes above 5.3V (with AVDD=5V) then you can turn on an internal protection diode and part will be in an invalid state.". Could this be the same scenario, an what is this diode for?

    KR, mat

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  • Thanks, jcolao,

    the meaning of the AMRs is quite clear to me. I want to find out what really happens in case of violating this restriction. In the AN_932 I found some explanation for the other restrictions but not to this one. Why is this dependancy between digital and analog voltage?

    https://ez.analog.com/thread/96902 mentions for the AD7266, which has a similar restriction: "If Vdrive goes above 5.3V (with AVDD=5V) then you can turn on an internal protection diode and part will be in an invalid state.". Could this be the same scenario, an what is this diode for?

    KR, mat

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