Hi Fawad,
Can you share the details of the application?
Are you trying to get an output voltage of 0V to +1.5V?
If this is the case, the easiest way to accomplish this is to supply a -1.5V reference. Keep in mind that you will need a transimpedance amplifier at the output of the DAC in order to convert the current to voltage. The transimpedance stage is not shown in the diagram you provided, but if you can share that with me, I can also review it for you.