Frequency Timing and Translation Modules
Model Name NW50M50LA/B
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Main Application
SONET, SDH, FTTH, Communications equipment
NEW
Frequency Controlled Crystal Oscillator (FCXO)
Stratum3 Module
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Features
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Two reference input frequencies in 9 steps from 8 kHz to 77.76 MHz.
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Compliant with Telecordia GR1244CORE, GR253.
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Hit-less reference switching.
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Frequency ramp control during reference switching.
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Simple hardware control for operational modes (Freerun, Locked to Ref 1 or 2 and
Holdover)
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Two output signals: one fixed at 8 kHz, one selectable (see specifications) up to 77.76 MHz.
* Module markings may be changed without notice.
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Specifications
Item
Supply Voltage (V
CC
)
Current Consumption
Operating Temp. Range
Input Levels
Input Reference Frequency (HMz)
Output Levels
Output Frequencies (MHz)
Free-run accuracy
PLL bandwidth
Model
NW50M50LA
+5.0 V DC ±5%
TCXO version 125 mA typ
OCXO version 525 mA typ turn on and 250 mA Steady state
0 to +70°C
2-CMOS
8 kHz, 1.544 MHz, 2.048 MHz, 12.96 MHz, 19.44 MHz, 25.92 MHz, 38.88 MHz, 51.84 MHz or 77.76 MHz
Two CMOS outputs
OPT Sync Outputs: 12.96 MHz, 19.44 MHz, 25.92 MHz, 38.88 MHz, 51.84 MHz or 77.76 MHz
±4.6×10
−6
max.
0.1 Hz
NW50M50LB
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List of Ordering Codes
Output frequency (MHz)
OTP Sync Output: One selectable up to 77.76 MHz
Ordering Code
NW50M50LA-[
NW50M50LB-[
]-NSA3438A
]-NSA3438B
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Control Functions
CNTL B
0
0
1
1
CNTL A
0
1
0
1
Mode of operation
FREE-RUN
Lock to REF 1
Lock to REF 2
Holdover
[
]: OTP Sync Output to order.
For example, in 19.44 MHz case, NW50M50LA-19.44M-NSA3438A
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Dimensions
50.8±0.3
5.08±0.3
1
18
14.8max
1.6±0.1
5.08±0.3
mm
PAD No.
#1
#2
#3
#4
#5
Connection
Holdover
REF1
REF2
FREE-RUN
GND
ALARM OUT
CNTL A
CNTL B
PLL UNLOCK
GND
SYNC OUT
GND
OPT Sync OUT
GND
EX REF 2
GND
EX REF 1
+5V
50.8±0.3
40.64±0.3
#6
#7
#8
#9
9
10
0.51±0.3
#10
#11
#12
#13
0.51±0.3
Detail A
Detail A
#14
#15
#16
#17
5.29±0.3
40.64±0.3
18 − ø1.78±0.2
18 − ø1.0±0.13
#18
co35_080205_NW50M50LA&B_e1
NDK [ NIHON DEMPA KOGYO ]
