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AD9954 can't output signal

Question asked by fangshengyun on Jul 18, 2018

I designed the schematic diagram of the AD9954 as shown in Figure 1 according to the schematic diagram of the evaluation board in the AD9954 data sheet. The reference clock is 20MHz, CFR1=0x00000000, CFR2=0x0000A4, and the SYNC_CLK pin can output 100MHz, indicating that the control command can be written to the register, but Iout has no output, and COMP_OUT also has no output. In addition, I bought an AD9954 development board before. The schematic diagram is shown in Figure 2. The program can be written into AD9954 ,COMP_OUT can  output the clock signal. The configuration pins are completely configured according to the connection of Figure 1, indicating that there is no problem with the program. Is there any problem with the schematic diagram of the AD9954 as shown in Figure 1?

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