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参数资料
| 型号： | STCD23100F35F |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟及定时 |
| 英文描述： | 2310 SERIES, LOW SKEW CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PBGA12 |
| 封装： | 1.20 X 1.60 MM, 0.40 MM PITCH, ROHS COMPLIANT, FLIP CHIP-12 |
| 文件页数： | 8/39页 |
| 文件大小： | 1948K |
| 代理商： | STCD23100F35F |
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Application information
STCD22x0, STCD23x0, STCD24x0
Doc ID 15400 Rev 2
4.6
Jitter
In the time domain, energy spreading can result in jitter, which is the same phenomenon as
phase noise in the frequency domain. As a sine wave passes its zero-crossing or a square
wave changes state, the real clock signal transition is not exactly the same as the ideal
case, thus causing variation in the waveform transition point. This deviation of the transition
point is known as jitter as illustrated in
Figure 8.
Jitter
In
Figure 8 the square wave ideal transition point should happen at points 1, 2, 3, 4 and 5,
and each "ideal" period PI1 to PI4 should be the same, thus no time jitter has occurred.
Actually, the real transition point happens at points 6, 7, 8, 9 and 10, thus causing "real"
periods PR1 to PR4 to not be the same, and exhibit visible jitter. If each of the real periods of
the cycles (PR1 to PR4) is measured, period jitter is obtained. The cycle-to-cycle jitter is
also obtained by calculating the difference between two adjacent periods (for example, PR2-
PR1, PR3-PR2 …).
These periods of jitter are described as peak-to-peak jitter and are calculated by subtracting
the minimum value from the maximum value or may also be described by the root-mean-
square (RMS) value, representing one standard deviation of the Gaussian distribution.
4.7
Output trace line
The STCD22x0, STCD23x0 and STCD24x0 is designed with maximum 50
Ω impedance
output. On the PC board, a 50
Ω transmission line with proper series termination should be
used to avoid signal distortion and reflection.
2345
1
PI1
PI2
PI3
PI4
PR1
PR2
PR3
PR4
t
78
9
10
6
Ideal transfer point
Real square wave transfer point
ai14029
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相关代理商/技术参数 |
参数描述 |
|---|---|
| STCD2400 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Multichannel clock distribution circuit |
| STCD2400F35F | 功能描述:MOSFET Multichannel Clock 1.8V RF 40pF RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube |
| STCD500100 | 制造商:Seagate Technology 功能描述:SEAGATE SLIM - Trays 制造商:Seagate Technology 功能描述:500GB Slim Portable USB 3.0 External Hard Drive |
| STCD500102 | 制造商:Seagate Technology 功能描述:SEAGATE SLIM (COBRA), BLACK USB 3.0 500GB - Trays |
| STCD500104 | 制造商:Seagate Technology 功能描述:500GB Backup Plus Portable USB 3.0 External Hard Drive Silver |
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