- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373783 > ZL30121GGG (ZARLINK SEMICONDUCTOR INC) SONET/SDH Low Jitter System Synchronizer PDF資料下載
參數(shù)資料
| 型號： | ZL30121GGG |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | SONET/SDH Low Jitter System Synchronizer |
| 中文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, PBGA100 |
| 封裝： | 9 X 9 MM, 0.80 MM PITCH, CABGA-100 |
| 文件頁數(shù)： | 15/30頁 |
| 文件大小： | 326K |
| 代理商： | ZL30121GGG |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁當(dāng)前第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁
ZL30121
Data Sheet
15
Zarlink Semiconductor Inc.
1.4 Ref and Sync Monitoring
All input references (
ref0
to
ref7
) are monitored for frequency accuracy and phase regularity. New references are
qualified before they can be selected as a synchronization source and qualified references are continuously
monitored to ensure that they are suitable for synchronization. The process of qualifying a reference depends on
four levels of monitoring.
Single Cycle Monitor (SCM)
The SCM block measures the period of each reference clock cycle to detect phase irregularities or a missing clock
edge. In general, if the measured period deviates by more than 50% from the nominal period, then an SCM failure
(scm_fail) is declared.
Coarse Frequency Monitor (CFM)
The CFM block monitors the reference frequency over a measurement period of 30
μ
s so that it can quickly detect
large changes in frequency. A CFM failure (cfm_fail) is triggered when the frequency has changed by more than 3%
or approximately 30000 ppm.
Precise Frequency Monitor (PFM)
The PFM block measures the frequency accuracy of the reference over a 10 second interval. To ensure an
accurate frequency measurement, the PFM measurement interval is re-initiated if phase or frequency irregularities
are detected by the SCM or CFM. The PFM provides a level of hysteresis between the acceptance range and the
rejection range to prevent a failure indication from toggling between valid and invalid for references that are on the
edge of the acceptance range.
When determining the frequency accuracy of the reference input, the PFM uses the external oscillator’s output
frequency (f
ocsi
) as its point of reference.
Guard Soak Timer (GST)
The GST block mimics the operation of an analog integrator by accumulating failure events from the CFM and the
SCM blocks and applying a selectable rate of decay when no failures are detected.
As shown in Figure 5, a GST failure (gst_fail) is triggered when the accumulated failures have reached the upper
threshold during the disqualification observation window. When there are no CFM or SCM failures, the accumulator
decrements until it reaches its lower threshold during the qualification window.
Figure 5 - Behaviour of the Guard Soak Timer during CFM or SCM Failures
ref
CFM or SCM failures
upper threshold
lower threshold
t
d
- disqualification time
t
q
- qualification time = n * t
d
t
d
t
q
gst_fail
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ZL30122 | SONET/SDH Low Jitter Line Card Synchronizer |
| ZL30122GGG | SONET/SDH Low Jitter Line Card Synchronizer |
| ZL30406 | SONET/SDH Clock Multiplier PLL |
| ZL30406QGC | Digital Multimeter Clamp Battery Size Code:9V; Current Measuring Range:40.00/400.0A; Current Setting AC:400A; Current Setting DC:400A; Resistance Measuring Range:400 Ohm, 4000 - 40 - 400 kOhm; Voltage Measuring Range AC:600 V RoHS Compliant: NA |
| ZL30406QGC1 | SONET/SDH Clock Multiplier PLL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZL30121GGG2 | 制造商:Microsemi Corporation 功能描述:PB FREE LOW JITTER SYSTEM SYNCHRONIZER |
| ZL30121GGG2V2 | 制造商:Microsemi Corporation 功能描述:REV 2 PB FREE LOW JITTER SYSTEM SYNCHRO 制造商:Microsemi Corporation 功能描述:REV 2 PB FREE LOW JITTER SYSTEM SYNCHRO - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SONET/SDH SYNCH 100CABGA 制造商:Microsemi Corporation 功能描述:IC SONET/SDH SYNCH 100CABGA |
| ZL30121GGGV2 | 制造商:Microsemi Corporation 功能描述:LOW JITTER SYSTEM SYNCHRONIZER 制造商:Microsemi Corporation 功能描述:REV 2 LOW JITTER SYSTEM SYNCHRONIZER - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SONET/SDH SYNCH 100CABGA 制造商:Microsemi Corporation 功能描述:IC SONET/SDH SYNCH 100CABGA |
| ZL30122 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:SONET/SDH Low Jitter Line Card Synchronizer |
| ZL30122GGG | 制造商:Microsemi Corporation 功能描述:LOW JITTER SYSTEM SYNCHRONIZER 制造商:Microsemi Corporation 功能描述:SONET/SDH LOW JITTER LINE CARD SYNCHRONIZER 64CABGA - Trays 制造商:Microsemi Corporation 功能描述:IC SONET/SDH SYNCH 64CABGA |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。