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AD9705 is not work properly

I’m using AD9705 with AVDD=3.3V, CLKVDD=3.3V and DVDD=3.3V power supply according to data sheet. The DAC_CLK and DB0~9 is controled by FPGA.

In my project, the DAC_CLK is 16Mhz, and IOUTA is connect to 400Ω resister to GND, IOUTB is connect to 400Ω resister to GND. whatever the DB0~9 data is,the voltage of the two 400Ω register is 3.3V。 It looks like AD9705 is not work.

May I ask what's going on here?