AD5422 Power Sequencing?

i currently have an evaluation board of the AD5422, and noticed that when i supply the AVdd first before the DVcc it only gives me an error of +/- 2mV(voltage output: 0-5V range) and when i supply DVcc first before AVdd it gives me an error of about 2V.

Based from my data that I got from the evaluation, it seems that need to power up the Analog first then the DVcc which was not mentioned on the ad5422 datasheet. I already checked whether there is something wrong with the data that the DAC is receiving and also the read back that the ADC is providing.

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  • 0
    •  Analog Employees 
    on May 7, 2012 4:28 PM

    Hi-

    I moved this question about the AD5422 to the Precision DACs Community.  Someone here should be able to assist you.

    Regards,

    AndyR

    EngineerZone Community Manager

  • 0
    •  Analog Employees 
    on May 8, 2012 3:26 PM

    Hi,

    Power Supply Sequencing has been tested on this part and has shown no issues.  I've also re-tried your conditions here and seen no issues. 

    It appears that you are changing the output range of the part from 0 - 5V to 0 - 10V at some point too.

    Can you send me a list of the commands you are sending to the part.  Also can you downloaded SW version 1.2 from the AD5422 webpage so that we are on the same version. 

    I can share my screen with you at a convenient time to go through.

    Regards,

    Michael (PDA Applications)