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MSTM-S3-INT

更新时间： 2024-11-05 01:25:31
品牌 Logo 应用领域
CONNOR-WINFIELD /
页数 文件大小 规格书
6页 249K
描述
Stratum 3 Simplified Control Timing Modules

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中文翻译

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MSTM-S3-INT 数据手册

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NETWORK ELEMENT TIMING GENERATOR  
C O N N O R THE CONNOR-WINFIELD CORPꢀ  
2111 COMPREHENSIVE DRIVEꢀ  
AURORA, IL 60505ꢀ  
FAX (630) 851-5040ꢀ  
PHONE (630) 851-4722  
HTTP://WWWꢀCONWINꢀCOM  
W I N F I E L D  
STRATUM 3 SIMPLIFIED CONTROL  
TIMING MODULES (MSTM-S3-INT)  
DESCRIPTION  
MSTM-S3 PIN ASSIGNMENT  
The Connor-Winfield Stratum 3 Simplified Control  
Timing Module acts as a complete system clock module for general  
Stratum 3 timing applicationsꢀ The MSTM is designed for  
external control functionsꢀ Full external control input allows for  
selection and monitoring of any of four possible operating states:  
1) Holdover, 2) External Reference #1, 3) External Reference  
#2, and 4) Free Runꢀ The table below illustrates the control signal  
inputs and corresponding operational states:  
HOLDOVER  
REF 1  
+5Vdc  
EX REF 1  
REF 2  
FRERUN  
GND  
GND  
EX REF 2  
GND  
ALARM OUT  
CNTL A  
CLK_OUT  
GND  
CNTL B  
SYNC_OUT  
GND  
PLL TVL  
In the absence of External Control Inputs (A,B), the  
MSTM enters the Free Run mode and signals an External Alarmꢀ  
The MSTM will enter other operating modes upon application of  
a proper control signalꢀ Mode 1 operation (A=1, B=0) results in  
an output signal that is phase locked to the External Reference  
Input #1ꢀ Mode 2 operation (A=0, B=1) results in an output signal  
that is phase locked to External Reference Input #2ꢀ Holdover  
mode operation (A=1, B=1) results in an output signal at or near  
the frequency as determined by the latest (last) locked-signal input  
values and the holdover performance of the MSTMꢀ  
BOTTOM VIEW  
BLOCK DIAGRAM  
0
1
2
FRERUN  
CNTL  
CNTL  
A
B
REF  
REF  
1
2
PLL TVL  
Alarm signals are generated at the Alarm Output during  
Holdover and Free Run operationꢀ Alarm Signals are also  
generated by loss-of-lock, loss of Reference, and by a Tune-Limit  
indication from the PLLꢀ A Tune-Limit alarm signal indicates  
that the VCXO tuning voltage is approaching within 10% the limits  
of its lock capability and that the External Reference Input may  
be erroneousꢀ A high level indicates an alarm conditionꢀ Real-  
time indication of the operational mode is available at unique  
operating mode outputs on pins 1-4ꢀ  
FREE RUN  
2:4  
3
HOLDOVER  
HOLDOVER  
ALARM  
OUT  
LOCK AND  
PHASE  
DETECTION  
EX REF  
EX REF  
1
2
2:1  
MUX  
COMPARATOR  
2:1  
MUX  
SYNC_OUT  
DAC  
DAC  
FIFO  
STRATUM3  
VCXO  
FILTERS  
TUNING  
VOLTAGE  
MONITOR  
STRATUM3  
TCXO  
CLK_OUT  
PLL TVL  
Control loop filters effectively attenuate any reference  
jitter and smooth out phase transientsꢀ  
MSTM-S3  
CONTROL  
INPUT  
ALARM  
OUTPUT  
OPERATIONAL MODE  
REF 1  
REF 2  
HLDOVER  
FRERUN  
PLL_TVL*  
A
B
0
0
Free Run (Default)  
0
0
0
1
0
1
External  
Reference  
#1  
Normal  
Tune Limit  
LOS + LOL  
1
1
1
0
0
0
0
0
0
0
0
0
0
1
0
0
1
1
1
0
External  
Reference  
#2  
Normal  
Tune Limit  
LOS + LOL  
0
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
1
1
0
1
1
1
Holdover  
0
0
1
0
0
1
INT  
DATA SHEET #: _T_M__0_1_1______ PAGE___1___ OF ___6____ REV:__0_0_____ DATE:___1_0_/_4_9_9____ © Copyright 1999 Connor-Winfield all rights reservedꢀ  
Specifications subject to change without noticeꢀ  
123456

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