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DS90UB913A-Q1: DS90UB913 has not output

Part Number: DS90UB913A-Q1

Dear Ti Engineer:

In my project ,I use ds90ub913 as serializer ,the signal path is cvbs --->tw9912 video decoder----CCIR656(8bit data+hsync+vsync+pclk)--->ds90ub913

I setup ds90ub913 pin PDB as high logic,MODE pin with 10kohm pullup 100kohm pulldown,pclk from tw9912,the signals can be probe at ds90ub913 pins( data & hsync&vsync &pclk(54MHZ/27Mhz));

but i can not get output at ds90ub913 pins(DOUT+ DOUT-),is there somthing that I have missed,pls help