PLL CRYSTAL UNITS FOR RADIO (NC-18C)
s
Features
8
NC-18C crystal units feature superlative frequency stability and are ideally suited for
wireless sets. In addition, they are sufficiently shockproof and suited for use in portable
equipment. They are highly reliable crystal units due to high frequency stability.
s
Specification
Frequency Range
Overtone
Temperature
Characteristics
Operating Temp.
Range
Frequency Tolerance
Equivalent
Series Resistance
Load Capacitance
5 ~ 7MHz
7 ~ 10MHz 10 ~ 25MHz
Fundamental
±5
×
10
-6
–10 ~ +60°C
±10
×
10
-6
(at 25°C)
60
Ω
max
30
Ω
max
20pF
25
Ω
max
•
Dimensions
10.10max
13.46max
3.55max
(mm)
20
±1
+0.05
–0.03
CRYSTAL UNITS
Measuring Circuit:
π
network (IEC Pub. 444)
Standard Frequency (MHz)
5.120
6.400
7.200
7.680
8.192
9.600
10.240
12.8
13.200
14.400
15.360
4.88
±0.20
ø0.43
5.00 max
11.45max
NC-18C
NR-18 is also available.
s
Technical Guidance (NC-18C)
•
Equivalent Series Resistance (R
1
)
(max)
500
•
Motional Capacitance (C
1
)
(Typical)
50.0
200
20.0
9th overtone
100
Fundamental
10.0
R
1
(Ω)
50
7th overtone
5th overtone
3rd overtone
5.0
20
Fundamental
2.0
3rd overtone
C
1
(fF)
10
1.0
5th overtone
0.5
1
2
5
10
20
50
100
200
500
FREQ (MHz)
0.2
7th overtone
9th overtone
•
Shunt Capacitance (C
0
)
(Typical)
10
0.1
5
8
10
20
50
100
200
500
FREQ (MHz)
Fundamental
C
0
(pF)
6
5
4
3rd, 5th, 7th, and 9th overtone
2
0
1
2
5
10
20
50
100
200
500
FREQ (MHz)
53
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