- 您现在的位置：买卖IC网 > PDF目录299803 > QT71HCD9M-50.000MHZ (Q-TECH CORP) CRYSTAL OSCILLATOR, CLOCK, 50 MHz, HCMOS OUTPUT PDF资料下载
参数资料
| 型号： | QT71HCD9M-50.000MHZ |
| 厂商： | Q-TECH CORP |
| 元件分类： | XO, clock |
| 英文描述： | CRYSTAL OSCILLATOR, CLOCK, 50 MHz, HCMOS OUTPUT |
| 封装： | ROHS COMPLIANT, LEADLESS, CERAMIC, SMD, 28 PIN |
| 文件页数： | 6/6页 |
| 文件大小： | 485K |
| 代理商： | QT71HCD9M-50.000MHZ |
6
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
LEADLESS CHIP CARRIER
CRYSTAL CLOCK OSCILLATORS
1.8 to 15Vdc - 732.4Hz to 150MHz
Q-TECH
CORPORATION
Leadless Chip Carrier (Revision G, August 2010) (ECO# 9935)
Phase noise is measured in the frequency domain, and is expressed as a ratio of signal power to noise power measured in a 1Hz
bandwidth at an offset frequency from the carrier, e.g. 10Hz, 100Hz, 1kHz, 10kHz, 100kHz, etc. Phase noise measurement is made
with an Agilent E5052A Signal Source Analyzer (SSA) with built-in outstanding low-noise DC power supply source. The DC source
is floated from the ground and isolated from external noise to ensure accuracy and repeatability.
In order to determine the total noise power over a certain frequency range (bandwidth), the time domain must be analyzed in the
frequency domain, and then reconstructed in the time domain into an rms value with the unwanted frequencies excluded. This may be
done by converting L(f) back to Sφ(f) over the bandwidth of interest, integrating and performing some calculations.
The value of RMS jitter over the bandwidth of interest, e.g. 10kHz to 20MHz, 10Hz to 20MHz, represents 1 standard deviation of
phase jitter contributed by the noise in that defined bandwidth.
Figure below shows a typical Phase Noise/Phase jitter of a QT66T10M, 5.0Vdc, 24MHz clock at offset frequencies 10Hz to 5MHz,
and phase jitter integrated over the bandwidth of 12kHz to 1MHz.
Phase Noise and Phase Jitter Integration
Period Jitter
As data rates increase, effects of jitter become critical with
its budgets tighter. Jitter is the deviation of a timing event
of a signal from its ideal position. Jitter is complex and
is composed of both random and deterministic jitter com-
ponents. Random jitter (RJ) is theoretically unbounded
and Gaussian in distribution. Deterministic jitter (DJ) is
bounded and does not follow any predictable distribution.
DJ is also referred to as systematic jitter. A technique to
measure period jitter (RMS) one standard deviation (1σ)
and peak-to-peak jitter in time domain is to use a high
sampling rate (>8G samples/s) digitizing oscilloscope.
Figure shows an example of peak-to-peak jitter and RMS
jitter (1σ) of a QT66T-24MHz, at 5.0Vdc.
RMS jitter (1σ): 8.20ps
Peak-to-peak jitter: 70.89ps
Symbol
Definition
∫
L(f)
Integrated single side band phase noise (dBc)
Sφ (f)=(180/Π)x
√2 ∫
L(f)df
Spectral density of phase modulation, also known as RMS phase error (in degrees)
RMS jitter = Sφ (f)/(fosc.360°)
Jitter(in seconds) due to phase noise. Note Sφ (f) in degrees.
QT66T10M, 5.0Vdc, 24MHz
相关PDF资料 |
PDF描述 |
|---|---|
| QTE-020-01-L-D-LC | 40 CONTACT(S), MALE, STRAIGHT BOARD STACKING CONNECTOR, SURFACE MOUNT |
| QTE-020-03-H-D-A | 40 CONTACT(S), MALE, STRAIGHT BOARD STACKING CONNECTOR, SURFACE MOUNT |
| QTE-020-03-L-D-K | 40 CONTACT(S), MALE, STRAIGHT BOARD STACKING CONNECTOR, SURFACE MOUNT |
| QTE-020-03-L-D-LC | 40 CONTACT(S), MALE, STRAIGHT BOARD STACKING CONNECTOR, SURFACE MOUNT |
| QTE-020-04-H-D-A | 40 CONTACT(S), MALE, STRAIGHT BOARD STACKING CONNECTOR, SURFACE MOUNT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| QT7F | 制造商:Switchcraft 功能描述:QG TWIST INSERT 7 P |
| QT7FBAU | 制造商:Switchcraft 功能描述:QG TWIST INSERT BLA |
| QT7M | 制造商:Switchcraft 功能描述:QG TWIST INSERT 7 P |
| QT7MB | 制造商:Switchcraft 功能描述:QG TWIST INSERT 7 PI |
| QT7MBAU | 制造商:Switchcraft 功能描述:QG TWIST INSERT BLA |
发布紧急采购，3分钟左右您将得到回复。