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Double AD99XX to make IQ local oscillator. Help needed.
Hi fellows!
I'm building a software defined radio that is mostly based on the "Software Defined Radios For The Masses" -articles and are at the point of designing the DDS board. I have two units of AD9954 DDS chips and my idea was to use them parallel, other one with 90 degree phase shift to generate the quadrature signal. This is my first time with DDS, so understanding the control seem to be a little bit difficult for a first timer. Two questions to start with: 1. I suppose for proper control I need four pins connected from the DDS to the computer (through buffers) I/O update, SDIO, SCLK and Reset, am I correct? 2. Do I have to drive two SDIO serial signals separately for each DDS chip from computer so, that I can define the phase shift for the other DDS (while other one has no phase shift, obivously) ? This came to my mind since the chips don't have any addresses to indentify them. Thanks a lot!!! 73 de Janne, OH1GTF |
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