Hi Torsten,
It seems that the AD7760/62 eval board is not interacting with the CED1Z. Can you confirm that you have applied external supply to the eval board to power it up? If so, can you check the current reading of the power source when shifting modes? Using the software GUI, try changing the power mode from the drop-down list. Your power source current reading should reflect approximately 170 mA to 240 mA when the power mode is changed from "Low Power" to "Normal Mode".
Regards,
Johnny