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Crystal Oscillator
NH37M28LK
High Precision Oscillator (Twin-OCXO)
for Fixed Communication Equipment
■ Main Application
● Base stations for system mobile communications ● Synthesizer
● Exchanger
●Measuring instrument
● High-end router
■ Features
● Excellent temperature characteristics.
● Supports wide temperature range. (−40 to +85°C).
● Excellent Holdover stability (Typ. 1μs/8h).
● Frequency adjustment by digital control method (I2C control).
(Voltage contorol method (Vcont) is also possible.)
■ Specifications
Model
Item
Measurement condition
Nominal Frequency (MHz)
NH37M28LK
10
Supply Voltage [VCC] (V)
+5.0 ±5 %
at start
Power Consumption (W)
Typ. 3.0 (Max. 3.5)
when stable (+25 °C)
Max. 1.2
LVCMOS (VOL Max. 0.4 V, VOH Min. 2.4 V)
Output Voltage
Symmetry (%)
45 to 55
at 1/2 VCC
Load Impedance (pF)
15
Operating Temperature Range (°C)
−40 to +85
Storage Temperature Range (°C)
−40 to +85
Stabilization Time
Stabilization Time (Frequency Stability) within
±10 ×10−9 after power on at +25°C ,
based on frequency after 60minutes operation.
Long-term Frequency Stability
Based on frequency after 7 days operation
Frequency/Temperature Characteristics
Frequency/Voltage Coefficient
−40 to +85 °C
After 7days operation,
20°C window in operating Temp. range.
8h period. *1
VCC +3.3 V ±5 %
Frequency Control Range
*2
Hold Over
Frequency Change Polarity
■ *1 Holdover condition
Offset Frequency
dBc/Hz
1k Hz
Typ. –152
10 Hz
Typ. –110
10k Hz
Typ. –157
100 Hz
Typ. –135
100k Hz
Typ. –160
mm
Max. 28.0
Min.3.0
0 #9
Holdover stability Reference Ambient Temp. profile
40
35
30
25
20
15
10
0
1
2
Frequency control
method
Specification Number
Tolerance ±0.2
-4-
3
4
Time [h]
5
6
7
8
■ *2 Specification Number
Control Range
17.8±0.3
12.70
10.16
7.62
5.08
2.54
#7
#10
Pin number is not printed
*NSA3641A : Vcont, DNC
NSA3640A : SCL, SDA
STAND OFF
#4 㸦4POINT㸧
#5
15.24±0.30
#1
Max.16.0
0.65
5×Ø0.45±0.15
Vcont / SCL(I2C) *
#1
#2 DNC(Don't connect)/ SDA(I2C) *
VCC
#3
OUTPUT
#4
#5
DNC(Don't connect)
DNC(Don't connect)
#6
#7
DNC(Don't connect)
#8
DNC(Don't connect)
#9
DNC(Don't connect)
#10
GND
●After 7days operation. ●Ramp rate: 10 °C/1h. ●Standby time: each 0.5h.
●Temp. condition Range: 20 °C window in operating Temp. range.
Ambient Temp. [°C]
dBc/Hz
Typ. –83
Pin connections
#8
Max. ±0.2×10−9
Positive
1 Hz
#6
Typ. ±1.0μs/8h
Typ. 1%
Max. 37.0
#2
Max. ±0.2×10−9
Linearity
■ Dimensions
#3
Max. ±50×10−9/year
Frequency Change Polarity
Offset Frequency
5×Ø0.80±0.15
25.4±0.3
17.78±0.30
Max. ±0.2×10−9/day
±0.3 to ±0.5 ×10−6
■ Reference Value
Phase
Noise
(at 10MHz)
Max. 5 minutes
Voltage control
(Vcont)
0 to 5.0V
NSA3641A
Digital control
(I2C control)
0x800000
to 0x7FFFFF
NSA3640A
Please specify the model name, frequency, and specification
number when you order products. For further questions regarding
specifications, please feel free to contact us.
1604A_NH37M28LK_e