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AD9913 serial interface

Question asked by lkz6991 on Jul 21, 2015
Latest reply on Jul 21, 2015 by KennyG

I would like to control an AD9913 via 3-wire serial interface (CS, SCLK, SDATA) but from reading the datasheet I am unclear if I have to also use the IO_UPDATE input line.  Can I connect IO_UPDATE to VDD?

I only want to use the DDS in single tone mode, and I am not concerned about synchronizing the change in clock frequencies with anything else.

Do I have to use IO_UPDATE, which means a minimum of 4 wires is required to control the AD9913?