ML145170
LANSDALE Semiconductor, Inc.
Figure 21. Example Application
φ
φ
NOTES:
1. The φ and φ outputs are fed to an external combiner/loop filter. See the Phase–Locked
R
V
Loop—Low–Pass Filter Design page for additional information. The φ and φ outputs swing
R
V
rail–to–rail. Therefore, the user should be careful not to exceed the common mode input range
of the op amp used in the combiner/loop filter.
2. For optimum performance, bypass the V pin to V (GND) with one or more low–inductance
DD
SS
capacitors.
3. The R counter is programmed for a divide value = OSC /f . Typically, f is the tuning resolution
in
R
R
required for the VCO. Also, the VCO frequency divided by f = N, where N is the divide value of
R
the N counter.
4. May be an R–C low–pass filter.
5. May be a bipolar transistor.
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