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參數(shù)資料
| 型號： | MC12429FA |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 400 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁數(shù)： | 9/9頁 |
| 文件大?。?/td> | 173K |
| 代理商： | MC12429FA |
MC12429
360
FREESCALE SEMICONDUCTOR ADVANCED CLOCK DRIVERS DEVICE DATA
Jitter Performance of the MC12429
The MC12429 exhibits long term and cycle-to-cycle jitter
which rivals that of SAW based oscillators. This jitter
performance comes with the added flexibility one gets with a
synthesizer over a fixed frequency oscillator.
Figure 8. RMS PLL Jitter versus VCO Frequency
Figure 8 illustrates the RMS jitter performance of the
MC12429 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
placements and record peak-to-peak as well as standard
deviations of the jitter. Care must be taken that the measured
edge is the edge immediately following the trigger edge. All of
the jitter data reported on the MC12429 was collected in this
manner.
Figure 9 shows the jitter as a function of the output
frequency. For the 12429 this information is probably of more
importance. The flat line represents an RMS jitter value that
corresponds to an 8 sigma
±25ps peak-to-peak long term
period jitter. The graph shows that for output frequencies from
87.5 to 400MHz the jitter falls within the
±25ps peak-to-peak
specification. The general trend is that as the output frequency
is decreased the output edge jitter will increase.
Figure 9. RMS Jitter versus Output Frequency
The jitter data presented should provide users with enough
information to determine the effect on their overall timing
budget. 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.
200
250
300
350
400
25
20
15
10
5
0
RMS
J
itt
er
(p
s)
VCO Frequency (MHz)
N=1
N=2
N=4
N=8
25
20
15
10
5
0
RMS
Ji
tte
r(
ps)
6.25ps Reference
Output Frequency (MHz)
25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400
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