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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.

Parents
  • 1) Vref from High Precision Reference (+2.5V). +5V supply shown in scheme below.

    2)

    • On the 1st output DAC symmetrical impulse with range from +12V to -12V or midscale (pin VrefA).
    • On the 2nd output DAC zero scale or midscale.

    3) Symmetrical impulse with range from 1V to -1V.

    4) Tried, it does not start.

    5) Readback function doesn’t work.

Reply
  • 1) Vref from High Precision Reference (+2.5V). +5V supply shown in scheme below.

    2)

    • On the 1st output DAC symmetrical impulse with range from +12V to -12V or midscale (pin VrefA).
    • On the 2nd output DAC zero scale or midscale.

    3) Symmetrical impulse with range from 1V to -1V.

    4) Tried, it does not start.

    5) Readback function doesn’t work.

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