synchronizing two dds to create quadrature dds

Question

Is it possible to create a quadrature oscillaion optput from two AD9833. I need changable quadrature signal, sine and cosine. What is the solution? 
 
 I have seen this: 
 Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers Application Note (AN-587) (analog.com) 
 But AD9833 does not contain W_CLK and FQ_UD.

Antonius · Accepted Answer

In that case you can use two AD9833 sharing the same MCLK and SPI. Initialize one of the chips with 90&deg; phase shift. At the timing of writing the frequency word, assert both CS at the same time so that they will start playing the waveform simultaneously.)

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synchronizing two dds to create quadrature dds