Analog Devices AD9510 User Manual page 15

R Divider Window
The R divider window (Figure 17) allows you to set the R divider value. The R divider can be programmed to be 0 to 16383, which would
yield a divide value range of 1 to 16384. The actual divide value is the programmed value plus one.
The R divider counter can also be reset from this window.
N Divider Window
The N divider window (Figure 18) allows you to set the prescaler, A counter, and B counter that control the N divider value. The prescaler
settings are selected from the list on the right. The A and B counter values are entered on the left. As each of these three variables are
changed, the N counter value automatically updates. This value is equal to the N divide value for the PLL.
A COUNTER
B COUNTER
AND RESET
In addition, there are check boxes to reset both counters or to bypass the B counter. For more information on the N divider setup, please
refer to the AD9510 data sheet.
Phase Frequency Detector (PFD) Window
Figure 19 shows the PFD window, which gives you control over the following PFD functions:
•
Lock Detection. Allows you to specify the precision of the lock detect function or disable it.
•
Loss of Reference. Allows you to enable/disable the loss of reference function as well as specify the mode and the number of PFD
cycles used to determine a loss of reference event.
•
Anti-Backlash Pulse Width. The default value 1.3 ns is recommended.
•
Phase Detector Polarity. Select either positive of negative.
R COUNTER
R COUNTER RESET
Figure 17. R Divider Window
BYPASS
Figure 18. N Divider Window
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AD9510/PCB
PRESCALER