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DAC8162: Oscillations in DAC8162 Output

Part Number: DAC8162
Other Parts Discussed in Thread: XTR111, OP07
We observed a issue in DAC8162. Following are the details:
At Normal ambient to approx 40C there is no fluctuations in DAC output, after 40 to 45C the device behaves weirdly. There is oscillation in the DAC output when the input given Through SPI is fixed. 
Below is the link of the video for your reference:
We have allowed DAC to give output as 2V constant.  The Fluke reading is the output from DAC.
The 5V Supply to DAC is also constant it is given through XTR111. 
Looking forward for your support. 
Regards,
Pitam M
R&D Design | TEMPERATURE
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