CX MINIATURE CRYSTALS
8MHz
to 160MHz
MINIATURE AT-CUT
SMD
CRYSTAL
EUROQUARTZ
Telephone:
+44(0)1460 230000
Fax:
+44(0)1460 230001
Email: sales@euroquartz.co.uk
Web: www.euroquartz.co.uk
CX-1-SM
Page
1 of 2
General Description
The miniature CX-1-SM crystals in leadless ceramic packages have
been designed for surface-mounting on printed circuit boards or
hybrid circuits. It is a robust crystal that has gained widespread
acceptance in the industry.
Surface-mount - infrared, vapour phase,
wave solder or epoxy mount techniques
Low profile, hermetically sealed package
Available with glass or ceramic lid
High shock and vibration resistance
Custom designs available
Full military environmental testing available
Specification
D
(TO P)
Frequency Range:
Calibration Tolerance*:
Load Capacitance:
Motional Resistance (R
):
Motional Capacitance (C
):
Quality Factor (Q):
Shunt Capacitance (C
):
Drive Level:
Temperature Stability**:
Ageing, first year:
Shock, survival***:
Vibration, survival:
Operating Temperature:
Storage Temperature:
Process Temperature:
A
E
D
B
C
E
Outline
CX-1-SM Package Dimensions
Dimension
Typical
(mm)
Maximum
(mm)
A
B
C
D
E
Dimension
C
8.00
3.56
-
1.14
1.52
Glass Lid
(mm max.)
8.38
3.94
see below
1.40
1.78
Ceramic Lid
(mm max.)
8MHz to 160MHz
A ±0.01% (±100ppm)
B ±0.1%
C ±1.0%
20pF (unless other required)
See table
See table
See table
See table
500
m
W max.
-10° to +70°C from ±10ppm
-40° to +85°C from ±20ppm
-55° to +125°C from ±30ppm
±5ppm max.
3000g 0.3ms, ½ sine
20g rms 10-2,000Hz random
-10°~+70°C (commercial)
-40°~+85°C (industrial)
-55°~+125°C (military)
-55°C~+125°C
260°C for 20 seconds
SM1
SM2
SM3
1.65
1.70
1.78
1.78
1.83
1.90
Specifications are typical at 25°C unless otherwise indicated.
The characteristics of the frequency stability parameter follow that of
AT-cut, thickness-shear mode crystals.
*
Closer calibration available, as low as ±5ppm
**
Does not include calibration tolerance
**
A higher shock version is available, refer to data sheet for
the model CX-1HG
Equivalent Circuit
L
R
CX-1 Motional Parameters, Q and C
Motional
Frequency
Resistance
R
(
Motional
Capacitance
C
(fF)
Quality
Factor
000s
Shunt
Capacitance
C
(pF)
1
C
C
2
9
)
10.0MHz
32MHz
155MHz
50
20
50
5.5
7.8
0.5
80
36
41
2.2
2.6
3.2
L
Motional Inductance
C
Motional Capacitance C
Shunt Capacitance
R
Motional Resistance
CX MINIATURE CRYSTALS
8MHz
to 160MHz
MINIATURE AT-CUT
SMD
CRYSTAL
EUROQUARTZ
Telephone:
+44(0)1460 230000
Fax:
+44(0)1460 230001
Email: sales@euroquartz.co.uk
Web: www.euroquartz.co.uk
CX-1-SM
Page
2 of 2
Circuit Design
Typical HCMOS Pierce Oscillator
A conventional HCMOS Pierce oscillator is shown below. The
crystal oscillates at a frequency f
O
above the crystal’s series-
resonant frequency. The crystal is effectively inductive and in
combination with R
F
, C
1
and C
2
in the feedback loop, provides
approximately 180° of the phase shift necessary to ensure
oscillation.
Designation
Termination
Terminations
SM1
SM2
SM3
Gold Plated
Nickel, Silver Plated
Nickel, Solder Plated and Solder Dipped
Packaging
Conventional HCMOS Pierce Oscillator Circuit
R
B
Amplifier
CX-1-SM - Bulk Pack (Standard)
- 16mm tape, 178mm or 330mm reels (Optional)
per EIA 481
- Tray Pack (Optional)
Buffer
Osc.
Freq. (Fo)
C
5
R
)
C
CX-1
C
Suggested Solder Pad Layout
1.78
4.06
6.86
Order Code
CX-1
O.T.=3rd O.T. Mode
Blank = Fundamental
Frequency
Total
Frequency
Tolerance
SM1
SM1
SM2
SM3
32MHz
( A
Calibration
Tolerance*
@ 25°C
A, B, C
/ 25ppm / 50ppm / I
Frequency
Stability
over
Temperature
Range
)
“S” if special
or custom design
Blank if standard
C = Ceramic Lid
Blank = Glass Lid
*For other calibration tolerances
enter figure in ppm
Temperature
Range:
C = Commercial
I = Industrial
M = Military
S = Specify
