CX MINIATURE CRYSTALS
18kHz
to 600kHz
MINIATURE
SMD CRYSTAL
EUROQUARTZ
Telephone:
+44(0)1460 230000
Fax:
+44(0)1460 230001
Email: sales@euroquartz.co.uk
Web: www.euroquartz.co.uk
CX-3V-SM
Page
1 of 2
General Description
The miniature CX-3V-SM crystals are leadless devices designed for
surface-mounting on printed circuit boards or hybrid substrates.
These crystals are intended for use in Pierce oscillators.
Hermetically sealed in a rugged, miniature ceramic package the
crystals are produced using a photo-lithographic process giving
repeatability and consistency.
Miniature tuning fork design
High shock resistance
Designed for low power applications
Compatible with hybrid or PCB mounting
Low ageing
Full military environmental testing available
Ideal for battery operated applications
Specification
Frequency Range:
Functional Mode:
Calibration Tolerance*:
Motional Resistance (R
):
Motional Capacitance (C
):
Quality Factor (Q):
Shunt Capacitance (C
):
Drive Level:
Turning Point (T
)**:
Temperature Coefficient:
Ageing, first year:
Shock***:
Vibration, survival:
Operating Temperature:
Storage Temperature:
Max. Process Temperature:
18kHz to 600kHz
Tuning Fork (Flexure)
A, B, or C (see below)
See Figure 1
Max: 18-25kHz, 2 x typ.
25-600kHz, 2.5 x typ.
See Figure 2
See Figure 3
min. is 0.25 x typ.
1.8pF max.
18-25kHz 0.5
µ
W max.
25-600kHz 1.0
µ
W max.
See Figure 4
-0.035ppm/°C
±5ppm max.
1,500g peak, 0.3ms, ½ sine
10g rms 20-2,000Hz random
-10°~+70°C (commercial)
-40°~+85°C (industrial)
-55°~+125°C (military)
-55°C~+125°C
260°C for 20 seconds
D
(TOP)
A
D
D
B
C
E
Outline
CX-3V-SM Package Dimensions
Dimension
Typical
(mm)
Maximum
(mm)
A
B
C
D
E
Dimension
“C”
6.73
2.62
-
1.27
1.32
Glass Lid
(mm max.)
7.11
2.90
see below
1.52
1.57
Ceramic Lid
(mm max.)
Specifications are typical at 25°C unless otherwise indicated.
*
**
***
Closer frequency calibration available
Other turning point available
A higher shock and vibration version is available.
SM1
SM2
SM3
1.47
1.52
1.60
1.75
1.80
1.88
CX-3V Crystal Calibration Tolerance at 25°C
Equivalent Circuit
L
1
R
1
Calibration
Frequency Range (kHz)
18~74.9
75~169.9
170~249.9
250~600
1
C
1
C
0
2
A
B
C
±0.003%
±0.01%
±0.1%
±0.005%
±0.01%
±0.1%
±0.01%
±0.02%
±0.2%
±0.02%
±0.05%
±0.5%
L
1
Motional Inductance
C
1
Motional Capacitance C
0
Shunt Capacitance
R
1
Motional Resistance
CX MINIATURE CRYSTALS
18kHz
to 600kHz
MINIATURE
SMD CRYSTAL
EUROQUARTZ
Telephone:
+44(0)1460 230000
Fax:
+44(0)1460 230001
Email: sales@euroquartz.co.uk
Web: www.euroquartz.co.uk
CX-3V-SM
Page
2 of 2
Figure 3 - CX-3V Typical Quality Factor (Q)
300
Circuit Design
Conventional HCMOS Pierce Oscillator Circuit
R
B
Amplifier
200
100
in '000s
50
Buffer
20
18
50
100
200
500
C
5
R
)
Osc.
Freq. (Fo)
Frequency
(kH
z)
C
CX-2
C
Figure 4 - CX-3V Typical Turning Point Temp. (°C)
+80
+70
+60
+50
+40
To(°C) +30
+20
+ 10
Figure 1 - CX-3V Typical Motional Resistance (R
)
300
200
100
50
R1
(k
9
)
20
10
5
0
- 10
-20
10
20
50
100 200
600
2
18
50
100 200
600
Frequency (kHz)
Frequency (kHz)
Figure 2 - CX-3V Typical Motional Capacitance (C
)
5
Solder Pad Layout
1.78
3.05
5.46
C1
(fF)
2
1.0
0.5
18
50
100
200
600
Frequency (kHz)
Terminations
Designation
Termination
Packaging
CX-1-SM - Bulk Pack (Standard)
- 16mm tape, 178mm or 330mm reels (Optional)
per EIA 481
- Tray Pack (Optional)
SM1
SM2
SM3
Gold Plated
Nickel, Silver Plated
Nickel, Solder Plated and Solder Dipped
Order Code
CX-3V
O.T.=3rd O.T. Mode
Blank = Fundamental
Frequency
-SM1 32.768kHz ( A
SM1
SM2
SM3
Calibration
Tolerance*
@ 25°C
A, B, C
*For other calibration
tolerances enter
figure in ppm
/
I
)
“S” if special
C = Ceramic Lid
Blank = Glass Lid
or custom design
Blank if standard
Temperature
Range:
C = Commercial
I = Industrial
M = Military
S = Specify
Microchip MCU
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