AD5542A DAC OUTPUT IS NOT GIVING 0V FOR 0x0000

trying to test ad5542a dac ic on breadboard without its complementary components(as recommended in one of the circuit notes provided for it).

Using SPI protocol, clock @8.33MHz .power supply used is 5V ,reference input is provided 2.4V, VLOGIC=5V,CLR is pulled up, LDAC is grounded. On serial data I am providing 5 samples as follow 0x0000, 0x3000, 0x8000, 0xC000, 0xFFFF.
As i am not using any output buffer so its unipolar output should swing from 0V to vref i. e. 0v to 2.5 v as vref=2.5V. But output seems to offset by 1.9v and also whole output is compressed to just 1.9v to 2.4v only.

please suggest some solution.

 

thanks in advance...

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