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DAC8734 : Consequences of not following Power Supply Sequencing

pawan kumar3
Prodigy 110 points
Other Parts Discussed in Thread: DAC8734

Hi Friends,

I have a DAC8734 and I don't follow any power sequencing although it is clearly explained in the datasheet.
My system works fine except for some random noise.

I am curious to know what would the consequences be if I do not follow Power Supply Sequencing. Is there any long term effect or anything else.

 

  • 0
    TI__Genius 10615 points

    Hello Pawan,

     

    At power-on, the registers on the device are being set to their default states using the digital supplies. By not following the power sequencing, the registers can be corrupted and the device will not behave as expected.

    pawan kumar3 said:
    I have a DAC8734 and I don't follow any power sequencing although it is clearly explained in the datasheet.
    My system works fine except for some random noise.

    This will vary from one device to another, one may work without the power sequencing and one may not. From my tests in the lab, I have experienced most devices will not work if the power sequence is not followed.

    pawan kumar3 said:
    Is there any long term effect or anything else.

    Even if the device is currently operational after power-on, it may start to display the power-on issues later on.  I would strongly suggest you follow the power sequence.

  • 0 in reply to Eugenio Mejia
    Prodigy 110 points

    Thanks Eugenio Mejia,

    Your inputs help me.

    Pawan

  • 0 in reply to Eugenio Mejia
    Prodigy 10 points

    Mark Seibel

    Can permanent damage result if power sequencing on DAC8734 is not strictly adhered to during test?

    AVSS must be < –3.5V if AVDD ≥ 1V.

     

  • 0 in reply to Mark Seibel
    TI__Genius 10615 points
    Hi Mark,

    I have not observed this on this device, but I can't guarantee that there won't be permanent damage. Usually all the problems are fixed by power cycling the device.