MC1648
Phase
Detector
MC4044
Voltage Controlled
Oscillator
Low Pass
Filter
f
f
ref
out
MC1648
f
= Nf where
out
N = N
ref
P + A
•
p
Modulus Enable Line
Counter Control
Logic
MC12014
MC12012
÷P, ÷(P+1)
Zero Detect Line
f
out
÷
N
÷A
p
Programmable
Programmable
Counter MC4016
Counter MC4016
Counter Reset Line
N = N P + A
•
p
Figure 9. Typical Frequency Synthesizer Application
+5.0Vdc
+5.0Vdc
1
14
1
7
14
3
10
10
12
Output
Output
1.0k min
3
5
12
7
5
8
8
Figure 10. Method of Obtaining a Sine–Wave Output
Figure 11. Method of Extending the Useful Range
of the MC1648 (Square Wave Output)
HIPERCOMM
BR1334 — Rev 4
7
MOTOROLA
MOTOROLA [ MOTOROLA ]
