DAC80501: DAC80501 no ADC output

I have problems with your new DAC80501.

 
My layout is is the tiny package with 8 pins, it is soldered  OK. I already exchanged the device, but the same result.
I am using the SPI-Bus.
 

I can switch the ref- voltage on and off, this means, my spi bus is correct:
code: 0x30 0x01 0x00 and 0x30 0x00 0x00  works great.

 

But I am not able to output any data!

I tested this with a second device, same behaviour.

 

Code for output data: 0x08 0x?? 0x??, where ? is the hex value to be outputted.
I thing the devices I got do not work.

Or what else is to be set???

I made software reset and checked all registers, anyway never any ADC output but 0V.

 


Tests:

When I connect the output pin over a resistor (5kOhm) with Vref (2.5V) the output stays at 0V; This is correct.

When I disable the chip, set to power down, the output is internally connected with 1kOhm to GND.

This is correct, because when I connect then the output over 5KOhm from Vref (2.5V) the output is about 0.4V this means soldering is OK.