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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 ,

    I gave 2 suggestions above, were you able to try them out? What were your observations?

    In case of incorrect start the outputs of the DAC have 3 values: 0, 128, 255. The both outputs power up at same voltages.

    Sorry I was not able to understand what you meant here, can you please clarify?

    Additionally, when debugging, can you make sure that only one DAC is connected to the system please?

    Cheers,

    Ivan

Reply
  • Hi ,

    I gave 2 suggestions above, were you able to try them out? What were your observations?

    In case of incorrect start the outputs of the DAC have 3 values: 0, 128, 255. The both outputs power up at same voltages.

    Sorry I was not able to understand what you meant here, can you please clarify?

    Additionally, when debugging, can you make sure that only one DAC is connected to the system please?

    Cheers,

    Ivan

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