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參數(shù)資料
| 型號： | MC12429 |
| 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)： | 6/10頁 |
| 文件大?。?/td> | 93K |
| 代理商： | MC12429 |
MC12429
MOTOROLA
TIMING SOLUTIONS
BR1333 — Rev 6
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
10
10
20
MHz
Note 3.
FMAXO
Maximum Output Frequency
VCO (Internal)
FOUT
400
25
800
400
MHz
Note 4.
tLOCK
Maximum PLL Lock Time
10
ms
tjitter
Cycle–to–Cycle Jitter (Peak–to–Peak)
±
25
ps
Note 4.,
See Applications Section
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
Note 4.
tr, tf
Output Rise/Fall
FOUT
300
800
ps
20%–80%, Note 4.
3. 10MHz is the maximum frequency to load the feedback devide registers. S_CLOCK can be switched at higher frequencies when used as a
test clock in TEST_MODE 6.
4. 50
to VCC – 2.0V pulldown.
APPLICATIONS INFORMATION
Using the On–Board Crystal Oscillator
The MC12429 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 MC12429 as
possible to avoid any board level parasitics. To facilitate
co–location surface mount crystals are recommended, but
not required. Because the series resonant design is affected
by capacitive loading on the xtal terminals loading variation
introduced by crystals from different vendors could be a
potential issue. For crystals with a higher shunt capacitance it
may be required to place a resistance across the terminals to
suppress the third harmonic. Although typically not required it
is a good idea to layout the PCB with the provision of adding
this external resistor. The resistor value will typically be
between 500 and 1K
.
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 MC12429 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 MC12429.
Table 1. Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance
Series Resonance*
Frequency Tolerance
±
75ppm at 25
°
C
Frequency/Temperature Stability
±
150pm 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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