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Single-Supply Voltage-Switching Mode of AD5449

Hi all


I have a question about AD5449.
When we used AD5449 as Single-Supply Voltage-Switching Mode,
VREFx output voltage was 3.88V max with VDD=5V、VIN(IOUT1x、RFBx)=5V.
Is it impossible taht VREFA outputs 5V ?

The datasheet says "In this type of application, the full range of multiplying capability of the DAC is lost.".
Is this means that VREFx cannot output 5V ?

Please let me know your comments.

Best Regards,