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參數(shù)資料
| 型號： | SK12430PJT |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 800 MHz, OTHER CLOCK GENERATOR, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 225K |
| 代理商： | SK12430PJT |
10
Revision 1/.ebruary 8, 2001
www.semtech.com
HIGH-PER.ORMANCE PRODUCTS
SK12430
ADVANCED
25
20
15
10
5
0
25
50
75
100
125
150
175
200
225
250
275
300
325
350
375
400
6.25 ps Reference
Output Frequency (MHz)
RMS
Jitter
(ps)
Figure 8 shows the jitter as a function of the output
frequency. For the SK12430, this information is prob-
ably 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 400 MHz, 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.
The jitter data from Figure 7 and Figure 8 do not in-
clude the performance of the SK12430, when the out-
put is in the divide by 1 mode. In divide by one mode,
the SK12430 output jitter distribution is bimodal. Since
a bimodal distribution cannot be accurately represented
with an rms value, peak-to-peak values of jitter for the
divide by one mode are presented.
Application Information (continued)
The oscilloscope cannot collect adjacent pulses, rather,
it collects pulses from a very large sample of pulses.
It is safe to assume that collecting pulse information
in this mode will produce period jitter values some-
what larger than if consecutive cycles (cycle-to-cycle
jitter) were measured. All of the jitter data reported on
the SK12430 was collected in this manner.
Figure 8. RMS Jitter
140
120
100
80
60
40
400
500
600
700
800
Spec Limit
N = 1
Output Frequency (MHz)
Peak-to-Peak
Jitter
(ps)
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 400MHz output, the peak-to-peak swing of the
SK12430 output will be approximately 700mV. This
swing will gradually degrade as the output frequency
increases, at 800MHz the output swing will be re-
duce to approximately 500mV. For a worst case analy-
sis, it would be safe to assume that the SK12430
output will always generate at least a 500mV output
swing. Note that most high speed ECL receivers re-
quire only a few hundred millivolt input swings for
reliable operation. As a result, the output generated
by the SK12430
will, under all conditions, be suffi-
cient for clocking standard ECL devices. Note that if
a larger swing is required the SK12430 could drive a
clock fanout buffer like the SK100EP111.
Figure 9. Peak-to-Peak Output Voltage Swing
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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SK125 | 制造商:Thomas & Betts 功能描述: |
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| SK12516 | 制造商:Cooper Wiring Devices 功能描述: |
| SK1260C | 制造商:DEC 制造商全稱:DEC 功能描述:12 AMP SCHOTTKY BARRIER RECTIFIERS |
| SK1270C | 制造商:DEC 制造商全稱:DEC 功能描述:12 AMP SCHOTTKY BARRIER RECTIFIERS |
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