A known behavior of IC reference voltage circuits is the shift induced by the soldering process. Figure 60 and Figure 61 show the effect of solder heat reflow for the DACx0508 internal reference.
Figure 60. DAC70508 and DAC60508 Solder Heat
Reflow Reference Voltage Shift
Figure 61. DAC80508 Solder Heat Reflow
Reference Voltage Shift