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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
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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 500mW max. -10 to +70C from 10ppm -40 to +85C from 20ppm -55 to +125C from 30ppm 5ppm max. 3000g 0.3ms, 1/2 sine 20g rms 10-2,000Hz random -10~+70C (commercial) -40~+85C (industrial) -55~+125C (military) -55C~+125C 260C for 20 seconds
SM1 SM2 SM3
1.65 1.70 1.78
1.78 1.83 1.90
Specifications are typical at 25C 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
R Motional Resistance
L Motional Inductance
C Motional Capacitance C Shunt Capacitance
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 fO above the crystal's seriesresonant frequency. The crystal is effectively inductive and in combination with RF, C1 and C2 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
RB Amplifier
CX-1-SM - Bulk Pack (Standard) - 16mm tape, 178mm or 330mm reels (Optional) per EIA 481 - Tray Pack (Optional)
Buffer Osc. Freq. (Fo)
C5
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* @ 25C 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

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