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MC145149DW датащи(PDF) 8 Page - Motorola, Inc

номер детали MC145149DW
подробное описание детали  Dual PLL Frequency Synthesizer
Download  12 Pages
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производитель  MOTOROLA [Motorola, Inc]
домашняя страница  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC145149DW датащи(HTML) 8 Page - Motorola, Inc

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MC145149
MOTOROLA
8
F(s) =
ζ =
ωn =
A)
NR1C
R1sC + 1
DEFINITIONS:
N = Total Division Ratio in Feedback Loop
K
φ (Phase Detector Gain) = VDD/4π for PDout
KVCO (VCO Gain) =
2
π∆fVCO
∆VVCO
Damping Factor:
ζ [ 1
1
C
VCO
PDout
N
ωn
2K
φKVCO
F(s) =
ζ =
ωn =
B)
(R1 +R2)sC + 1
R2sC + 1
C
VCO
R2
PDout
R1
R1
NC(R1 + R2)
R2C+
N
K
φKVCO
0.5
ωn
K
φKVCO
K
φKVCO
RECOMMENDED READING:
Gardner, Floyd M.,
Phaselock Techniques (second edition). New York, Wiley–Interscience, 1979.
Manassewitsch, Vadim,
Frequency Synthesizers: Theory and Design (second edition). New York, Wiley–Interscience, 1980.
Blanchard, Alain,
Phase–Locked Loops: Application to Coherent Receiver Design. New York, Wiley–Interscience, 1976.
Egan, William F.,
Frequency Synthesis by Phase Lock. New York, Wiley–Interscience, 1981.
Rohde, Ulrich L.,
Digital PLL Frequency Synthesizers Theory and Design. Englewood Cliffs, NJ, Prentice–Hall, 1983.
Berlin, Howard M.,
Design of Phase–Locked Loop Circuits, with Experiments. Indianapolis, Howard W. Sams and Co., 1978.
Kinley, Harold,
The PLL Synthesizer Cookbook. Blue Ridge Summit, PA, Tab Books, 1980.
AN535, Phase–Locked Loop Design Fundamentals, Motorola Semiconductor Products, Inc., 1970.
AR254, Phase–Locked Loop Design Articles, Motorola Semiconductor Products, Inc., Reprinted with permission from
Electronic Design,
1987.
for a typical design
ωn (Natural Frequency)
2
πfr
10
(at phase detector input).
Figure 9. Phase–Locked Loop Low–Pass Filter Design
DESIGN CONSIDERATIONS
CRYSTAL OSCILLATOR CONSIDERATIONS
The following options may be considered to provide a ref-
erence frequency to Motorola’s CMOS frequency synthe-
sizers.
Use of a Hybrid Crystal Oscillator
Commercially available temperature–compensate crystal
oscillators (TCXOs) or crystal–controlled data clock oscilla-
tors provide very stable reference frequencies. An oscillator
capable of sinking and sourcing 50
µA at CMOS logic levels
may be direct or dc coupled to OSCin. In general, the highest
frequency capability is obtained utilizing a direct–coupled
square wave having a rail–to–rail (VDD to VSS) voltage
swing. If the oscillator does not have CMOS logic levels on
the outputs, capacitive or ac coupling to OSCin may be used.
OSCout, an unbuffered output, should be left floating.
For additional information about TCXOs and data clock
oscillators, please consult the latest version of the
eem Elec-
tronic Engineers Master Catalog, the Gold Book, or similar
publications.
Design an Off–Chip Reference
The user may design an off–chip crystal oscillator using
ICs specifically developed for crystal oscillator applications,
such as the MC12061 MECL device. The reference signal
from the MECL device is ac coupled to OSCin. For large am-
plitude signals (standard CMOS logic levels), dc coupling is
used. OSCout, an unbuffered output, should be left floating.
In general, the highest frequency capability is obtained with a
direct–coupled square wave having rail–to–rail voltage
swing.
Use of the On–Chip Oscillator Circuitry
The on–chip amplifier (a digital inverter) along with an ap-
propriate crystal may be used to provide a reference source
frequency. A fundamental mode crystal, parallel resonant at


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