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DAC5687: DAC5687 analog output resistors calculation

Part Number: DAC5687


I am using DAC5687. I am using an IOVDD = 1.8V.

I have issues in generating and analog output from the DAC.

When i put the a pull up of 24.9ohms to 3.3V i see DAC output voltage of 0.5Vp-p.

I see signal of 0.5Vp-p but when i place series 0 ohms after 24.9ohms i do not see any output at the end of 0 ohms.  

Is this chip capable of IOVDD =1.8V?

please help to get an analog output.