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參數(shù)資料
| 型號： | MC12430 |
| 廠商： | Motorola, Inc. |
| 英文描述： | High Frequency PLL Clock Generator(高頻PLL時鐘發(fā)生器) |
| 中文描述： | 高頻PLL時鐘發(fā)生器（高頻鎖相環(huán)時鐘發(fā)生器） |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 127K |
| 代理商： | MC12430 |
MC12430
MOTOROLA
ECLinPS and ECLinPS Lite
DL140 — Rev 3
6
AC CHARACTERISTICS
(TA = 0
°
to 70
°
C, VCC = 3.3V to 5.0V
±
5%)
Symbol
Characteristic
Min
Max
Unit
Condition
FMAXI
Maximum Input Frequency
S_CLOCK
Xtal Oscillator
FREF_EXT
10
10
10
20
Note 3.
MHz
Note 2.
FMAXO
Maximum Output Frequency
VCO (Internal)
FOUT
400
50
800
800
MHz
tLOCK
Maximum PLL Lock Time
10
ms
tjitter
Cycle–to–Cycle Jitter (Peak–to–Peak) Note 4.
±
25
±
65
ps
N = 2, 4, 8; Note 5.
N = 1; Note 5.
ts
Setup Time
S_DATA to S_CLOCK
S_CLOCK to S_LOAD
M, N to P_LOAD
20
20
20
ns
th
Hold Time
S_DATA to S_CLOCK
M, N to P_LOAD
20
20
ns
tpwMIN
Minimum Pulse Width
S_LOAD
P_LOAD
50
50
ns
tr, tf
Output Rise/Fall
FOUT
300
800
ps
20%–80%
2. 10MHz is the maximum frequency to load the feedback divide registers. S_CLOCK can be switched at higher frequencies when used as a test
clock in TEST_MODE 6.
3. Maximum frequency on FREF_EXT is a function of the internal M counter limitations. The phase detector can handle up to 100MHz on the input,
but the M counter must remain in the valid range of 200
≤
M
≤
400. See the Programming Interface section on page 3 of this data sheet for
more details.
4. See Applications Information below for additional information.
5. 50
to VCC – 2.0V pull–down.
APPLICATIONS INFORMATION
Using the On–Board Crystal Oscillator
The MC12430 features a fully integrated on–board crystal
oscillator to minimize system implementation costs. The
oscillator is a series resonant, multivibrator type design as
opposed to the more common parallel resonant oscillator
design. The series resonant design provides better stability
and eliminates the need for large on chip capacitors. The
oscillator is totally self contained so that the only external
component required is the crystal. As the oscillator is
somewhat sensitive to loading on its inputs the user is
advised to mount the crystal as close to the MC12430 as
possible to avoid any board level parasitics. To facilitate
co–location surface mount crystals are recommended, but
not required.
The oscillator circuit is a series resonant circuit and thus
for optimum performance a series resonant crystal should be
used. Unfortunately, most crystals are characterized in a
parallel resonant mode. Fortunately, there is no physical
difference between a series resonant and a parallel resonant
crystal. The difference is purely in the way the devices are
characterized. As a result, a parallel resonant crystal can be
used with the MC12430 with only a minor error in the desired
frequency. A parallel resonant mode crystal used in a series
resonant circuit will exhibit a frequency of oscillation a few
hundred ppm lower than specified, a few hundred ppm
translates to kHz inaccuracies. In a general computer
application, this level of inaccuracy is immaterial. Table 1
below specifies the performance requirements of the crystals
to be used with the MC12430.
Table 1. Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance*
Frequency Tolerance
±
75ppm at 25
°
C
Frequency/Temperature Stability
±
150ppm 0 to 70
°
C
Operating Range
0 to 70
°
C
Shunt Capacitance
5–7pF
Equivalent Series Resistance (ESR)
50 to 80
Correlation Drive Level
100
μ
W
Aging
5ppm/Yr (First 3 Years)
* See accompanying text for series versus parallel resonant
discussion.
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| MC12430FA | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HIGH FREQUENCY PLL CLOCK GENERATOR |
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| MC12439 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HIGH FREQUENCY PLL CLOCK GENERATOR |
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| MC1243F | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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