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

    Another moment. I have 2 identical boards, on which there is one chip DAC. There are cases: 1) when both DACs are not turned on 2) one of the two DACs is turned on 3) both DACs are turned on correctly.

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

    Another moment. I have 2 identical boards, on which there is one chip DAC. There are cases: 1) when both DACs are not turned on 2) one of the two DACs is turned on 3) both DACs are turned on correctly.

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