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參數(shù)資料
| 型號(hào)： | MC145200DT |
| 廠商： | MOTOROLA INC |
| 元件分類： | XO, clock |
| 英文描述： | 8-Pin High Frequency 4-Amp Sink Synchronous MOSFET Driver 8-SON -40 to 125 |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 2000 MHz, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 16/23頁 |
| 文件大?。?/td> | 331K |
| 代理商： | MC145200DT |
MC145200
MC145201
16
MOTOROLA
NOTE: The PDout either sources or sinks current during out–of–lock conditions. When locked in phase and frequency, the
output is high impedance and the voltage at that pin is determined by the low–pass filter capacitor. PDout,
φ
R, and
φ
V are shown with the polarity bit (POL) = low; see Figure 14 for POL.
fR
REFERENCE
REFin
÷
R
fV
FEEDBACK
fin
÷
(N
×
64 + A)
PDout
φ
R
φ
V
LD
VH
VL
SOURCING CURRENT
VH
VH
VL
FLOAT
VH
VL
VL
VL
VH
*
SINKING CURRENT
VH = High voltage level
VL = Low voltage level
*At this point, when both fR and fV are in phase, the output source and sink circuits are turned on for a short interval.
Figure 18. Phase/Frequency Detectors and Lock Detector Output Waveforms
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–compensated crystal
oscillators (TCXOs) or crystal–controlled data clock oscilla-
tors provide very stable reference frequencies. An oscillator
capable of CMOS logic levels at the output may be direct or
dc coupled to REFin. If the oscillator does not have CMOS
logic levels on the outputs, capacitive or ac coupling to REFin
may be used (see Figure 8).
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
discrete transistors or ICs specifically developed for crystal
oscillator applications, such as the MC12061 MECL device.
The reference signal from the MECL device is ac coupled to
REFin (see Figure 8). For large amplitude signals (standard
CMOS logic levels), dc coupling may be used.
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
the desired operating frequency, should be connected as
shown in Figure 19.
The crystal should be specified for a loading capacitance
(CL) which does not exceed approximately 20 pF when used
at the highest operating frequency of 15 MHz. Assuming
R1 = 0
, the shunt load capacitance (CL) presented across
the crystal can be estimated to be:
CL =
CinCout
Cin+Cout
+ Ca + Cstray +C1
C2
C1 + C2
where
Cin = 5 pF (see Figure 20)
Cout = 6 pF (see Figure 20)
Ca = 1 pF (see Figure 20)
C1 and C2 = external capacitors (see Figure 19)
Cstray = the total equivalent external circuit stray
capacitance appearing across the crystal
terminals
The oscillator can be “trimmed” on–frequency by making a
portion or all of C1 variable. The crystal and associated com-
ponents must be located as close as possible to the REFin
and REFout pins to minimize distortion, stray capacitance,
stray inductance, and startup stabilization time. Circuit stray
capacitance can also be handled by adding the appropriate
stray value to the values for Cin and Cout. For this approach,
the term Cstray becomes 0 in the above expression for CL.
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| MC145200F | 2.0 GHz PLL Frequency Synthesizers |
| MC145201 | 8-Pin High Frequency 4-Amp Sink Synchronous MOSFET Driver 8-SON -40 to 125 |
| MC145201DT | 2.0 GHz PLL Frequency Synthesizers |
| MC145201F | 2.0 GHz PLL Frequency Synthesizers |
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