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ADF4159 Single sawtooth burst generation settings/procedure

Hi team,
I want to generate a single sawtooth ramp burst from ADF4159 PLL. I went through the datasheet but the concept was not explained detailly. 
So, using the application software, I set the main controls and ramp-shift keying controls as shown below
After writing the registers, I connected the EXT VCO out SMA pin to a Signal Hound (spectrum analyzer) to observe the output.
Question is,
Do I need to give the TXDATA trigger pulse in order to generate the single sawtooth burst? If it is so, can I control the single ramp generation whenever I required it upon giving trigger pulse?
Kindly correct me where I went wrong in my understanding and experiment procedure.