Channel Divider Window - Analog Devices UG-182 User Manual

UG-182
Feedback (N) Divider Window
Figure 18. N Divider Window
The N Divider window shown in Figure 18 is accessed by
clicking the N DIVIDER box in Figure 17. It allows you to set
the feedback divider.
VCO Divider 1 and Divider 2
The VCO dividers controls are located in the PLL 2 Controls
window shown in Figure 17. They allow you to set the frequency
feeding the channels. Channel OUT4 through Channel OUT9
can be configured for either Divider 1 or Divider 2. If Divider 2
is not required, it is recommended that it be turned off for best
spurious performance.
Charge Pump Window
Figure 19. Charge Pump Window
The Charge Pump Setup window shown in Figure 19 is
accessed by clicking the CHARGE PUMP box in Figure 17.
This window is most often used to vary the charge pump
current.

CHANNEL DIVIDER WINDOW

The channel divider window shown in Figure 20 is accessed by
clicking the appropriate channel divider (see Figure 21) in the
main window shown in Figure 6. It is usually sufficient to
change only the divide ratio, because the evaluation software and
the AD9523-1 duty cycle correction feature ensure that the
output duty cycle remains very close to 50%.
You can also vary the phase offset by changing the phase offset
bits setting under the Divider Phase box in Figure 20. However,
for the new phase to take effect, the SYNC signal must be
toggled, by clicking the SYNC button shown in
selecting Strobe SyncB.
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Evaluation Board User Guide
Figure 20. Channel Divider Window
Figure 21. Channel Divider
Figure 22. Toggling SYNC Signal
Figure 22 and