HCC4046BF STMICROELECTRONICS [STMicroelectronics], HCC4046BF Datasheet - Page 9

• Manufacturer Part Number: HCC4046BF
• Description: MICRMICROPOWER PHASE-LOCKED LOOP _
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

DESIGN INFORMATION
This information is a guide for approximating the values of external components for the HCC/HCF 4046B in
a Phase-Locked-Loop system. The selected external components must be within the following ranges :
5k
* G.S. Mosckytz ”miniaturized RC filters using phase Lockedloop” BSTJ, may 1965
CHARACTERISTICS
VCO Frequency
For No Signal Input
Frequency Lock
Range, 2 f
Frequency Capture
Range, 2 f
Loop Filter
Component Selection
Phase Angle
Between Signal and
Comparator
Locks on Harmonics
of Centre Frequency
Signal Input Noise
Rejection
R1, R2, R
L
C
S
1M
VCO in PLL System will Adjust to centre
frequency f
90
0
o
OFFSET R2 =
VCO WITHOUT
o
and 180
at Centre Frequency (f
USING PHASE COMPARATOR I
o
o
at ends of lock range (2 f
C1
High
Yes
100pF at V
o
), approximating
VCO WITH
OFFSET
2 f
L
DD
= full VCO frequency range
L
2 f
)
5V
L
= f
max
VCO in PLL System will Adjust to Lowest
Operating Frequency f
- f
VCO WITHOUT
OFFSET R2 =
min
USING PHASE COMPARATOR II
C1
Always 0
50pF at V
f
Low
C
No
= f
min
HCC/HCF4046B
o
in lock
L
DD
VCO WITH
OFFSET
10V
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