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MSTM-S3-T2NC Datasheet(PDF) 1 Page - Connor-Winfield Corporation

Part No. MSTM-S3-T2NC
Description  STRATUM 3 SIMPLIFIED CONTROL TIMING MODULES
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Maker  CONNOR-WINFIELD [Connor-Winfield Corporation]
Homepage  http://www.conwin.com
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MSTM-S3-T2NC Datasheet(HTML) 1 Page - Connor-Winfield Corporation

   
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Specifications are subject to change without notice
DATA SHEET #: TM020
REVISION #: P00
FILENAME: TM020.DOC
DATE: 7/18/00
Page 1 of 7
Copyright 1999,2000 Connor-Winfield all rights reserved
THE CONNOR-WINFIELD CORP.
Stratum 3 Simplified Control
Timing Modules (MSTM-S3-T2NC)
FREERUN
REF 1
REF 2
HOLDOVER
CNTL A
CNTL B
2:4
0
1
2
3
2:1
MUX
DAC
FILTERS
TUNING
VOLTAGE
MONITOR
DAC
FIFO
STRATUM3
OCXO
PLL TVL
SYNC_OUT
ALARM
OUT
PLL TVL
FREE RUN
HOLDOVER
LOCK AND
DETECTION
BLOCK DIAGRAM
MSTM-S3
EX REF 1
EX REF 2
CLK_OUT
TCXO
No
Connect
Fig. 2.0
DESCRIPTION
The
Connor-Winfield
Stratum
3
Miniature
Simplified Control Timing Module acts as a complete system
clock module for general Stratum 3 timing applications. The
MSTM is designed for external control functions. Full
external control input allows for selections and monitoring of
any of four possible operating states: 1) Holdover, 2) External
Reference #1, 3) External Reference #2, and 4) Free Run. The
table
below
illustrates
the
control
signal
inputs
and
corresponding operational states:
In the absence of External Control Inputs (A,B), the
MSTM enters the Free Run mode and signals an External
Alarm. The MSTM will enter other operating modes upon
application of a proper control signal. Mode 1 operation (A=1,
B=0) results in an output signal that is phase locked to the
External Reference Input #1. Mode 2 operation (A=0, B=1)
results in an output signal that is phase locked to External
Reference Input #2. 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 MSTM.
Alarm signals are generated at the Alarm Output
during Holdover and Free Run operation. Alarm Signals are
also generated by loss-of-lock, loss of Reference, and by a
Tune-Limit indication from the PLL. A Tune-Limit alarm
signal
indicates
that
the
OCXO
tuning
voltage
is
approaching within 10% the limits of its lock capability and
that the External Reference Input may be erroneous. A high
level indicates an alarm condition. Real-time indication of
the operational mode is available at unique operating mode
outputs on pins 1-4.
Control
loop
filters
effectively
attenuate
any
reference
jitter
and
smooth
out
phase
transients
.
Table 1.0
CONTROL
INPUT
OPERATIONAL MODE
REF 1
REF 2
HLDOVER
FREERUN
PLL TVL
ALARM
OUTPUT
A
B
0
0
Free Run (Default)
0
0
0
1
0
1
1
0
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
1
1
Holdover
0
0
1
0
0
1
MSTM-S3 PIN ASSIGNMENT
BOTTOM VIEW
+5Vdc
EX REF 1
GND
EX REF 2
GND
CLK_OUT
GND
SYNC_OUT
GND
HOLDOVER
REF 1
REF2
FREERUN
GND
ALARM OUT
CNTL A
CNTL B
PLL TVL
Fig. 1.0


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