UG-383 Datasheet, PDF (9/16 Pages) Analog Devices – Self-contained board, including synthesizer

EV-ADF4159EB1Z/EV-ADF4159EB3Z User Guide
UG-383
USING THE SOFTWARE—RAMP AND SHIFT-KEY
CONTROLS
In the Ramps and Shift-keying tab, you can configure the
ramping and shift-keying functionality of the ADF4159.
The ramp type can be selected in the Ramp mode drop-down
box, and the various ramp parameters can be set in CLK1 and
Up Ramp boxes.
Example
Figure 8 shows the ramping and shift-keying settings for an
example of a continuous triangular ramp of 128 up ramp steps
over 50 MHz with an up ramp time of 96 µs. (Up ramp refers to
the ramp from the initial frequency to the end frequency,
whereas down ramp refers to the ramp/jump from the end
frequency back to the initial frequency.) For 50 MHz, the PLL is
programmed for a 25 MHz ramp because the evaluation board
uses the RFOUT/2 signal. After each parameter is set in the
software, it needs to be written to the part.
The other options in this tab allow configuring the various
ramps and shift-keying controls of the ADF4159.
Figure 8. Example of Ramp
Rev. B | Page 9 of 16