I am trying to use an AD9959 to frequency modulate and I am experiencing difficulty getting it to do so continuously. In the evaluation software I currently have a 500 MHz ref clock. I have RU\RD diabled and I have 2-level mod selected.
In the channel control I have channel2 selected with Frequency Modulation output type.
On channel 2 I am trying to modulate a 80 MHz frequency. So say I want both 84 and 80 MHz output signals I only see the frequency change when I manually hit P2 on the Profile and RURD Pin Control. And in my mind the output signal should carry both frequencies not a single one. I'm looking at this on a spectrum analyzer and not seeing both frequencies. Any advice would be appreciated.