DAC60508: The DAC output channels are at LOW

Hi Team,

In my design I am using DAC part number: DAC60508ZRTET.

My problem is that I write data using SPI, but the outputs are stuck at "0".

Some more details:

1. I measured using scope SPI signals - the CLK is looking good, the CS goes low during writing, SDI signal contains data of channel number and it's data, the SDO is an echo of the previous written data. The data is ready at falling edge of the CLK.
2. I measure pin 1 - ref voltage, it's value is 2.5v as expected. I measures the voltages and they are 3.3v.
3. I am using only 5 outputs. The other are not connected.
4. All the registers are at defaule state. The only data I write is the data of the channels [DAC0 - DAC4].

What am I doing wrong? What is the correct initialization? Why are the outputs are at low?

Regards,

Marvin