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AD9238 can't output

      Before, AD9238 was very good for use , but now the chip can't  output any digital signal.The difference between now and before is PCB board ,then  other configuration parameters have not be changed, such as CLK 8MHZ(clk-input)、 Pown and OEB( are be set to a low level).Are there any other  reasons that  can lead the chip can't output digital singal ?