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| 型号： | STM-S3-19.44MHZ |
| 厂商： | Connor-Winfield |
| 文件页数： | 1/6页 |
| 文件大小： | 0K |
| 描述： | STRATUM 3 TIMING MODULE 19.44MHZ |
| 标准包装： | 200 |
| 系列： | STM-S3 |
| 类型： | VCXO |
| 频率： | 19.44MHz |
| 输出： | TTL |
| 电源电压： | 7V |
| 工作温度： | 0°C ~ 50°C |
| 电流 - 电源（最大）： | 60mA（标准） |
| 安装类型： | 通孔 |
| 尺寸/尺寸： | 3.937" L x 2.400" W（100.00mm x 60.96mm） |
| 高度： | 0.600"（15.24mm） |
| 封装/外壳： | 24-DIP 模块 |
| 包装： | 散装 |
| 其它名称： | Q747422 |
W I N F I E L D AURORA, IL 851-5040.
C O N N O R THE CONNOR-WINFIELD CORP.
2111 COMPREHENSIVE DRIVE.
60505.
FAX (630)
PHONE (630) 851-4722
HTTP://WWW.CONWIN.COM
DESCRIPTION
NETWORK ELEMENT TIMING GENERATOR
STRATUM 3 SIMPLIFIED CONTROL
TIMING MODULES (STM-S3)
STM-S3 PIN ASSIGNMENT
The Connor-Winfield Stratum 3 Simplified Control
Timing Module acts as a complete system clock module for general
Stratum 3 timing applications. The STM is designed for external
control functions. 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 Run. The table below illustrates the control signal inputs
and corresponding operational states:
+5Vdc
EX REF 1
GND
EX REF 2
GND
N/C
CLK_OUT
HLDOVR
REF 1
REF 2
FRERUN
GND
N/C
N/C
In the absence of External Control Inputs (A,B), the STM
enters the Free Run mode and signals an External Alarm. The
STM 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 STM.
GND
N/C
SYNC_OUT
GND
PLL TVL
BOTTOM VIEW
N/C
N/C
ALARM OUT
CNTL A
CNTL B
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 VCXO 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.
CNTL A
CNTL B
EX REF 1
EX REF 2
2:4
2:1
MUX
0
1
2
3
BLOCK DIAGRAM
FRERUN
REF 1
PLL TVL
REF 2
FREE RUN
HOLDOVER
HOLDOVER
LOCK AND
PHASE DETECTION
COMPARATOR
DAC
STRATUM3
DAC
FILTERS
VCXO
TUNING
STRATUM3
FIFO
VOLTAGE
TCXO
MONITOR
ALARM OUT
2:1
MUX
CLK_OUT
SYNC_OUT
PLL TVL
STM-S3
C O N T R O L
I N P U T
O P E R A T I O N A L M O D E
R E F 1
R E F 2
H L D O V R
F R E R U N
P L L _ T V L *
A L A R M
O U T P U T
A
B
0
0
F r e e R u n ( D e f a u l t )
0
0
0
1
0
1
1
0
1
0
1
1
E x t e r n a l
R e f e r e n c e
# 1
E x t e r n a l
R e f e r e n c e
# 2
N o r m a l
T u n e L i m i t
L O S + L O L
N o r m a l
T u n e L i m i t
L O S + L O L
H o l d o v e r
1
1
1
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
1
1
INT
Specifications subject to change without notice.
TM000
DATA SHEET #: ____________
1 6
PAGE______ OF _______
04 1/3/2000
REV:________ DATE:____________ ? Copyright 2000 Connor-Winfield all rights reserved.
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