AD5680 problems with writing to the inputregister (SPI)

Question

Hello, 
 I have a AD5680 and I want to write to it's inputregister with SPI. But the outputvoltage dosn't change. The SYNC on the picture falls befor sending and rises after the last CLK. I use a frequency by 3,8kHz. Any ideas why the DAC don't accept the data? 
 Torsten

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AD5680 problems with writing to the inputregister (SPI)