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No signal on SYNC_CLK pin

Category: Hardware
Product Number: AD9910

Hello everyone! Please help me to solve this issue! 

I have my own pcb with ad9910. I have signal on REF_CLK pin, the issue îs that on SYNC_CLK pin îs no signal and the write on registers îs not working. Epad îs connected to gnd, EXT_PWD pin îs connected to gnd. What else can I check?