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AD9176 Power Sequence

The AD9176 Rev B datasheet does not appear to clarify a required power sequence for the power rails.  Can you please define this requirement, or point me to a document that states what this might be? 

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  • Hi JCurran476,

    Thanks for reaching out. The reason that the AD9176 datasheet does not have any power-up sequencing guidelines is because such a procedure is not needed. The reason for not needing a power-up sequence can best be explained by looking at the Absolute Maximum Ratings Table in the AD9176 datasheet:

    From the above table, it is clear that all of the power domains are independent of each other; AVDD1.8, DVDD1.8, AVDD1.0, DVDD1.0, and SVDD1.0 can be powered up in any order, and the part will not be damaged. Once the appropriate power domains have been applied, you can begin applying other signals such as SYSREF, SERDINx, etc.

    Let me know if you have any questions!

    echaykov

  • Hi echaykov,

    What about during DC-coupled operation? The datasheet suggests a -0.6V with 50ohm resistors. Is there any risk with the -0.6V being applied prior to the DAC rails being powered up?

    Thanks.

    Mark

  • Hi Mark,

    I would highly recommend that you use the following power up sequence:

    1. Enable supplies for DAC power domains (AVDD, DVDD, etc.)
    2. Digitally program DAC as desired
    3. Enable supply for -0.6 V output biasing

    Having -0.6 V enabled prior to powering the DAC could be a bit risky since the DAC output impedance may not be defined during power up or when the DAC is powered off. Applying -0.6 V after powering on and programming the DAC is a much safer method.

    Let me know if you have any additional questions!

    echaykov

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  • Hi Mark,

    I would highly recommend that you use the following power up sequence:

    1. Enable supplies for DAC power domains (AVDD, DVDD, etc.)
    2. Digitally program DAC as desired
    3. Enable supply for -0.6 V output biasing

    Having -0.6 V enabled prior to powering the DAC could be a bit risky since the DAC output impedance may not be defined during power up or when the DAC is powered off. Applying -0.6 V after powering on and programming the DAC is a much safer method.

    Let me know if you have any additional questions!

    echaykov

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