I am a rookie in utilising DDS, anyway we are asking for a FSK modulation with 1Mbit of bandwidth. Is it possibe to obtain such value with AD9834 (75MHz), just toggling FSEL input?
The maximum frequency for toggling the FSELECT pin is not indicated on the data sheet but you can follow figure 4 on the Timing Characteristics (page 6) of the AD9834 data sheet for the minimum setup time of FSELECT with respect to MCLK.
It is possible to have FSK modulation using the AD9834. Load the two frequency registers of the AD9834 with two different frequencies that has a difference of 1MHz, then use the FSEL pin to toggle between frequencies.
Thank you Mark,
do you have an idea of the maximum frequency I could toggle the FSELECT pin?
Thank you very much.
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