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AD5429: DAC does not start up correctly sometimes

I have a problem that AD5429 can not start up correctly. The start up fails once or twice every 10 times power up.

In that case, DAC output does not change even tough applying any command and power up command. Does not respond to program (Clear DAC output to zero scale - 0xBXXX) and hardware reset (~CLR pin to 0). DAC use both channels: 1) as a programmble gain element; 2) standart unipolar mode. If DAC start correctly, work both channels, reset and correctly responds to commands from the microprocessor. Please refer to the attached my schematic and let me know if there are anything that need an improvement.

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  • Hi ,

    Can you please make sure that VDD is applied first, followed by reference voltage on VREFB, then lastly Vin on RFBA. If this is followed, please do observe if this still happens.

    Does your answer to my second question mean that when the problem happens, the outputs of the 2 channels could power up at different voltages?

    On my fourth question, what I was trying to say was starting from no power applied to DAC, just supply VDD then VREFB (no RFBA) then observe it eh problem still occurs.

    Cheers,

    Ivan

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  • Hi ,

    Can you please make sure that VDD is applied first, followed by reference voltage on VREFB, then lastly Vin on RFBA. If this is followed, please do observe if this still happens.

    Does your answer to my second question mean that when the problem happens, the outputs of the 2 channels could power up at different voltages?

    On my fourth question, what I was trying to say was starting from no power applied to DAC, just supply VDD then VREFB (no RFBA) then observe it eh problem still occurs.

    Cheers,

    Ivan

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