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problems with AD7564


We have been having an issuewith the quad DAC device AD7564. Every so often the device powers up in a bad state where it does not put out the programed  currents.This happens perhaps 1% of the time.When it does happen, the problem continues until power is cycled again. It seems to be exacerbated by chattering power supply during power up.  Timing and signal levels from the DSP are fine. Has any one else ever seen this problem? is there some kind of work around, perhaps a requirement on how the power supply comes up?

Thanks and Best Regards,

-Tim Starr on behalf of LM@PE

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