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| 型号： | AD9514/PCBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL CLOCK 3CH AD9514 |
| 设计资源： | AD9513/14/15 Eval Brd Schematics AD9513/14/15 Gerber Files AD9514 Eval Brd BOM |
| 标准包装： | 1 |
| 主要目的： | 计时，时钟分配 |
| 已用 IC / 零件： | AD9514 |
| 已供物品： | 板 |
| 相关产品： | AD9514BCPZ-ND - IC CLOCK DIST 3OUT PLL 32LFCSP AD9514BCPZ-REEL7-ND - IC CLOCK DIST 3OUT PLL 32LFCSP |
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AD9514
Rev. 0 | Page 14 of 28
TERMINOLOGY
Phase Jitter and Phase Noise
An ideal sine wave can be thought of as having a continuous
and even progression of phase with time from 0 to 360 degrees
for each cycle. Actual signals, however, display a certain amount
of variation from ideal phase progression over time. This
phenomenon is called phase jitter. Although there are many
causes that can contribute to phase jitter, one major component
is due to random noise that is characterized statistically as being
Gaussian (normal) in distribution.
This phase jitter leads to a spreading out of the energy of the
sine wave in the frequency domain, producing a continuous
power spectrum. This power spectrum is usually reported as a
series of values whose units are dBc/Hz at a given offset in
frequency from the sine wave (carrier). The value is a ratio
(expressed in dB) of the power contained within a 1 Hz
bandwidth with respect to the power at the carrier frequency.
For each measurement, the offset from the carrier frequency is
also given.
It is also meaningful to integrate the total power contained
within some interval of offset frequencies (for example, 10 kHz
to 10 MHz). This is called the integrated phase noise over that
frequency offset interval and can be readily related to the time
jitter due to the phase noise within that offset frequency
interval.
Phase noise has a detrimental effect on the performance of
ADCs, DACs, and RF mixers. It lowers the achievable dynamic
range of the converters and mixers, although they are affected
in somewhat different ways.
Time Jitter
Phase noise is a frequency domain phenomenon. In the
time domain, the same effect is exhibited as time jitter. When
observing a sine wave, the time of successive zero crossings is
seen to vary. For a square wave, the time jitter is seen as a
displacement of the edges from their ideal (regular) times of
occurrence. In both cases, the variations in timing from the
ideal are the time jitter. Since these variations are random in
nature, the time jitter is specified in units of seconds root mean
square (rms) or 1 sigma of the Gaussian distribution.
Time jitter that occurs on a sampling clock for a DAC or an
ADC decreases the SNR and dynamic range of the converter.
A sampling clock with the lowest possible jitter provides the
highest performance from a given converter.
Additive Phase Noise
It is the amount of phase noise that is attributable to the device
or subsystem being measured. The phase noise of any external
oscillators or clock sources has been subtracted. This makes it
possible to predict the degree to which the device affects the
total system phase noise when used in conjunction with the
various oscillators and clock sources, each of which contribute
their own phase noise to the total. In many cases, the phase
noise of one element dominates the system phase noise.
Additive Time Jitter
It is the amount of time jitter that is attributable to the device
or subsystem being measured. The time jitter of any external
oscillators or clock sources has been subtracted. This makes it
possible to predict the degree to which the device will affect the
total system time jitter when used in conjunction with the
various oscillators and clock sources, each of which contribute
their own time jitter to the total. In many cases, the time jitter of
the external oscillators and clock sources dominates the system
time jitter.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9515 | 制造商:AD 制造商全称:Analog Devices 功能描述:1.6 GHz Clock Distribution IC, Dividers, Delay Adjust, Two Outputs |
| ad9515/pcb | 制造商:Analog Devices 功能描述:EVAL KIT FOR 1.6 GHZ CLOCK DISTRIBUTION IC, DIVIDERS, DLY AD - Bulk |
| AD9515/PCBZ | 功能描述:BOARD EVAL CLOCK 2CH AD9515 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
| AD9515BCPZ | 功能描述:IC CLOCK DIST 2OUT PLL 32LFCSP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:2,000 系列:- 类型:PLL 频率合成器 PLL:是 输入:晶体 输出:时钟 电路数:1 比率 - 输入:输出:1:1 差分 - 输入:输出:无/无 频率 - 最大:1GHz 除法器/乘法器:是/无 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-LSSOP（0.175"，4.40mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:NJW1504V-TE1-NDNJW1504V-TE1TR |
| AD9515BCPZ-REEL7 | 功能描述:IC CLOCK DIST 2OUT PLL 32LFCSP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:1,000 系列:Precision Edge® 类型:时钟/频率合成器 PLL:无 输入:CML，PECL 输出:CML 电路数:1 比率 - 输入:输出:2:1 差分 - 输入:输出:是/是 频率 - 最大:10.7GHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VFQFN 裸露焊盘，16-MLF? 供应商设备封装:16-MLF?（3x3） 包装:带卷 (TR) 其它名称:SY58052UMGTRSY58052UMGTR-ND |
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