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Part Number: DAC5571
i have a question concerning the DAC "DAC5571".
I´m using this chip in my circuit and most of the times it works without problems, but
Sometimes the output voltage is reset to 0V without receiving any I2C command.
In my application the output voltage should stay for 10min. After 10min an I2C command
from my microcontroller will set the output voltage to 0V. This works most of the times,
but sometimes the output voltage is reset to 0V long before the 10min have passed without receiving any I2C command.
I have attached two oscilloscope pictures where the behavior can be seen.
Picture1 shows the expected behavior, Picture2 shows the faulty behavior
Does anyone have an idea what the reason for this behavior could be?
Any help is appreciated.
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In reply to Uttam Sahu:
In reply to Kai Becker:
thanks for your anwer.
Yes that was also my thought, that the DAC is going through a power-on reset cycle. This seems to be the obvious reason, but I thought that
the power supply that I have now (without DAC) is good enough for the DAC.
Of course the datasheet mentions that the power supply should be very "clean".
Here is the shematic of the DAC 5571
And here is the power supply for the DAC5571 coming from the mainboard
If you need more information please let me know.
thanks for your efforts and help.
You are certainly right with everything you said. I will first try to improve the situation on one board so that
the customer that complained about the behavior can use our device. Then I will start the layout of the
Thanks you very much again for your help!
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