Siddharth, If you are operating over high temperatures, then you calculation of PD=5*300uA is correct. This would give a max power dissipation of 1.5mA. From the datasheet, the supply current is typically 150uA and max 200uA at 3.3V supply and at an ambient temperature of 25°C. The larger 300uA max comes from the operating temperature range going to 125°C. The power dissipation given as 0.9mW is the typical power dissipation, not the max. The easiest way to estimate the typical power consumption is to look at the typical characteristic curve for operating current. This can be found in Figure 2 of the ADS1018 datasheet. Joseph Wu
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