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