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參數資料
| 型號： | NBC12439 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 3.3V/5V Programmable PLL Synthesized Clock Generator(3.3V/5V可編程PLL合成時鐘發生器) |
| 中文描述： | 3.3V/5V的可編程鎖相環路合成時鐘發生器（3.3V/5V的可編程PLL頻率合成時鐘發生器） |
| 文件頁數： | 14/20頁 |
| 文件大小： | 208K |
| 代理商： | NBC12439 |
NBC12439, NBC12439A
http://onsemi.com
14
There are different ways to measure jitter and often they
are confused with one another. An earlier method of
measuring jitter is to look at the timing signal with an
oscilloscope and observe the variations in period-to-period
or cycle-to-cycle. If the scope is set up to trigger on every
rising or falling edge, set to infinite persistence mode and
allowed to trace sufficient cycles, it is possible to determine
the maximum and minimum periods of the timing signal.
Digital scopes can 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. These scopes can
also store a finite number of period durations and
post-processing software can analyze the data to find the
maximum and minimum periods.
Recent hardware and software developments have
resulted in advanced jitter measurement techniques. The
Tektronix TDS-series oscilloscopes have superb jitter
analysis capabilities on non-contiguous clocks with their
histogram and statistics capabilities. The Tektronix
TDSJIT2/3 Jitter Analysis software provides many key
timing parameter measurements and will extend that
capability by making jitter measurements on contiguous
clock and data cycles from single-shot acquisitions.
M1 by Amherst was used as well and both test methods
correlated.
This test process can be correlated to earlier test methods
and are more accurate. All of the jitter data reported on the
NBC12439 and NBC12439A was collected in this manner.
Figure 12 shows the RMS jitter performance as a function
of the VCO frequency range. The general trend is that as the
VCO frequency is increased, the RMS output jitter will
decrease.
Figure 13 illustrates the RMS jitter performance versus
the output frequency. Note 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.
Long-Term Period Jitter
is the maximum jitter
observed at the end of a period's edge when compared to the
position of the perfect reference clock's edge and is specified
by the number of cycles over which the jitter is measured.
The number of cycles used to look for the maximum jitter
varies by application but the JEDEC spec is 10,000 observed
cycles.
The NBC12439 and NBC12439A exhibit long term and
cycle-to-cycle jitter, which rivals that of SAW based
oscillators. This jitter performance comes with the added
flexibility associated with a synthesizer over a fixed
frequency oscillator. 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.
Figure 12. Cycle-to-Cycle RMS Jitter vs.
VCO Frequency
VCO FREQUENCY (MHz)
400
500
600
700
800
25
20
15
10
5
0
R
N = 1
N = 8
N = 2
N = 4
Figure 13. Cycle-to-Cycle RMS Jitter vs.
Output Frequency
25
20
15
10
5
0
R
800
700
600
500
400
300
200
100
OUTPUT FREQUENCY (MHz)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NBC12439/D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.3V / 5V Programmable PLL Synthesized Clock Generator with Power Down (50 to 800MHz) |
| NBC12439_07 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.3V/5V Programmable PLL Synthesized Clock Generator |
| NBC12439A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.3V/5V Programmable PLL Synthesized Clock Generator |
| NBC12439AFA | 功能描述:時鐘發生器及支持產品 3.3V/5V Programmable RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| NBC12439AFAG | 功能描述:鎖相環 - PLL 3.3V/5V Programmable PLL Clock Generator RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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