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参数资料
| 型号： | MC12430FNR2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 800 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 9/9页 |
| 文件大小： | 132K |
| 代理商： | MC12430FNR2 |
4
MC12430
MOTOROLA ADVANCED CLOCK DRIVERS DEVICE DATA
387
Jitter Performance of the MC12430
The MC12430 exhibits long term and cycle–to–cycle jitter
which rivals that of SAW based oscillators. This jitter perfor-
mance comes with the added flexibility one gets with a synthe-
sizer over a fixed frequency oscillator.
Figure 8. RMS PLL Jitter versus VCO Frequency
0
5
10
15
20
25
400
500
600
700
800
N=2
N=4
N=8
VCO Frequency (MHz)
RMS
Jitter
(ps)
Figure 8 illustrates the RMS jitter performance of the
MC12430 across its specified VCO frequency range. Note that
the jitter is a function of both the output frequency as well as
the VCO frequency, however the VCO frequency shows a
much stronger dependence. The data presented has not been
compensated for trigger jitter, this fact provides a measure of
guardband to the reported data.
The typical method of measuring the jitter is to accumulate
a large number of cycles, create a histogram of the edge place-
ments and record peak–to–peak as well as standard devi-
ations of the jitter. Care must be taken that the measured edge
is the edge immediately following the trigger edge. The oscillo-
scope cannot collect adjacent pulses, rather it collects pulses
from a very large sample of pulses.
Figure 9. RMS Jitter versus Output Frequency
0
5
10
15
20
25
25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400
Output Frequency (MHz)
RMS
Jitter
(ps)
6.25ps Reference
Figure 9 shows the jitter as a function of the output frequen-
cy. For the 12430, this information is probably of more impor-
tance. The flat line represents an RMS jitter value that corre-
sponds to an 8 sigma
±25 ps peak–to–peak long term period
jitter. The graph shows that for output frequencies from 87.5 to
400 MHz the jitter falls within the
±25 ps peak–to–peak specifi-
cation. The general trend is that as the output frequency is
decreased the output edge jitter will increase.
The jitter data from Figure 8 and Figure 9 do not include the
performance of the 12430 when the output is in the divide by 1
mode. In divide by one mode, the MC12430 output jitter dis-
tribution is bimodal. Since a bimodal distribution cannot be ac-
curately represented with an rms value, peak–to–peak values
of jitter for the divide by one mode are presented.
Figure 10 shows the peak–to–peak jitter of the 12430 output
in divide by one mode as a function of output frequency. Notice
that as with the other modes the jitter improves with increasing
frequency. The
±65 ps shown in the data sheet table repre-
sents a conservative value of jitter, especially for the higher
VCO, and thus output frequencies.
Figure 10. Peak–to–Peak Jitter versus
Output Frequency
40
60
80
100
120
140
400
500
600
700
800
Spec Limit
N=1
Output Frequency (MHz)
Peak-to-Peak
Jitter
(ps)
The jitter data presented should provide users with enough
information to determine the effect on their overall timing bud-
get. The jitter performance meets the needs of most system
designs while adding the flexibility of frequency margining and
field upgrades. These features are not available with a fixed
frequency SAW oscillator.
Output Voltage Swing vs Frequency
In the divide by one mode, the output rise and fall times will
limit the peak to peak output voltage swing. For a 400 MHz
output, the peak to peak swing of the 12430 output will be
approximately 700 mV. This swing will gradually degrade as
the output frequency increases, at 800 MHz the output swing
will be reduced to approximately 500 mV. For a worst case
analysis, it would be safe to assume that the 12430 output will
always generate at least a 500mV output swing. Note that
most high speed ECL receivers require only a few hundred
millivolt input swings for reliable operation. As a result, the out-
put generated by the 12430 will, under all conditions, be suffi-
cient for clocking standard ECL devices. Note that if a larger
swing is required the MC12430 could drive a clock fanout buff-
er like the MC100EP111.
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相关代理商/技术参数 |
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