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MC14046B Datasheet(PDF) 4 Page - ON Semiconductor

Part No. MC14046B
Description  Phase Locked Loop
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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MOTOROLA CMOS LOGIC DATA
MC14046B
4
Figure 1. Phase Comparators State Diagrams
PHASE COMPARATOR 1
Input Stage
PCAin
XX
PCBin
00
01
11
10
PC1out
01
PHASE COMPARATOR 2
Input Stage
PCAin
XX
PCBin
PC2out
01
3–State
Output Disconnected
LD
(Lock Detect)
00
1
Refer to Waveforms in Figure 3.
00
01
10
11
00
10
01
11
00
01
10
11
Characteristic
Using Phase Comparator 1
Using Phase Comparator 2
No signal on input PCAin.
VCO in PLL system adjusts to center
frequency (f0).
VCO in PLL system adjusts to minimum
frequency (fmin).
Phase angle between PCAin and PCBin.
90
° at center frequency (f0), approaching 0_
and 180
° at ends of lock range (2fL)
Always 0
_ in lock (positive rising edges).
Locks on harmonics of center frequency.
Yes
No
Signal input noise rejection.
High
Low
Lock frequency range (2fL).
The frequency range of the input signal on which the loop will stay locked if it was
initially in lock; 2fL = full VCO frequency range = fmax – fmin.
Capture frequency range (2fC).
The frequency range of the input signal on which the loop will lock if it was initially
out of lock.
Depends on low–pass filter characteristics
(see Figure 3). fC v fL
fC = fL
Center frequency (f0).
The frequency of VCOout, when VCOin = 1/2 VDD
VCO output frequency (f).
Note: These equations are intended to be
a design guide. Since calculated component
values may be in error by as much as a
factor of 4, laboratory experimentation may
be required for fixed designs. Part to part
frequency variation with identical passive
components is typically less than
± 20%.
Where: 10K
v R1 v 1 M
10K
v R2 v 1 M
100pF
v C1 v .01 µF
Figure 2. Design Information
+ fmin
fmin =(VCO input = VSS)
R2(C1 + 32 pF)
1
fmax =
R1(C1 + 32 pF)
1
(VCO input = VDD)




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