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CX MINIATURE CRYSTALS
760kHz to 1.35MHz MINIATURE QUARTZ CRYSTAL
EUROQUARTZ
Telephone: +44(0)1460 230000 Fax: +44(0)1460 230001 Email: sales@euroquartz.co.uk Web: www.euroquartz.co.uk
CX-2
Page 1 of 2
General Description
The CX-2 quartz crystal is a high quality extensional mode resonator. The CX-2 is hermetically sealed in a rugged, miniature ceramic package, a quarter the size of an eight pin dual-in-line package. The crystal is manufactured utilizing a photo-lithographic process, ensuring consistency and repeatability of electrical characteristics.
-02 End Lead 2.39 1 2 3 5.21 A 1.27 5.08 2.54 -03 Side Lead 6.60 2.39 1 6.60 5.33 2 -04 Side Lead 6.60 3 3 1 2

Extensional mode Ideal for use with microprocessors Designed for low-power applications Compatible with hybrid or PCB Low ageing Ideal for battery powered applications Full military environmental testing available
Specification
760kHz to 1.35MHz Extensional A 0.05% (50ppm) B 0.1% C 1.0% 5kW max. Motional Resistance (R): 1.2fF Motional Capacitance (C): 150k Quality Factor (Q): 1.0pF max. Shunt Capacitance (C): 3mW max. Drive Level: 35C Turning Point (T)**: -0.035ppm/C Temperature Coefficient (k): Note: frequency (f) deviation from frequency (fo) @ turning point temperature (To): f-fo k(T-To) =
Frequency Range: Functional Mode: Calibration Tolerance*:
2
Outline and Dimensions
Notes: 1. Terminal 1 is electrically connected to terminal 3. 2. Lead Dimensions: width 0.33mm typical, thickness 0.18mm. 3. A = Glass Lid - 2.03mm max. Ceramic Lid - 2.41mm max.
Equivalent Circuit
L R
1
C C
2
5ppm max. 1,000g 0.3ms, 1/2 sine 10g rms 20 - 1,000Hz -10~+70C (commercial) -40~+85C (industrial) -55~+125C (military) -55C~+125C Storage Temperature: Lead to Package temp. not to Process Temperature: exceed 175C Glass lid to package seal rim temp. not to exceed 210C Specifications are typical at 25C unless otherwise indicated. * Closer calibration available ** Other turning point available
Ageing, first year: Shock, survival: Vibration, survival: Operating Temperature:
fo
R Motional Resistance
L Motional Inductance
C Motional Capacitance C Shunt Capacitance
CX MINIATURE CRYSTALS
760kHz to 1.35MHz MINIATURE QUARTZ CRYSTAL
EUROQUARTZ
Telephone: +44(0)1460 230000 Fax: +44(0)1460 230001 Email: sales@euroquartz.co.uk Web: www.euroquartz.co.uk
CX-2
Page 2 of 2
Typical Application
Typical application for Pierce oscillator Conventional HCMOS Pierce Oscillator Circuit
RB Amplifier
The low-profile CX miniature leaded crystal is ideal for small, high density, battery operated portable products. A CX crystal incorporated into a Pierce oscillator (single inverter) circuit provides a high stability with low current consumption. A conventional HCMOS Pierce oscillator circuit is shown below. The crystal is effectively inductive and in a Pi-network circuit with C and C providing the additional phase shift necessary to sustain oscillation. The oscillation frequency (f ) is 15 to 150ppm above the crystals series resonant frequency (f ).
1 2 0 S
Buffer Osc. Freq. (Fo)
C5
R)
Drive Level
A
R is used to limit the crystals drive level by forming a voltage divider between R and C . R also stabilizes the oscillator against changes in the amplifiers output resistance (R ). R should be increased for higher voltage operation.
A 1 A 0 A
C
CX-2
C
Load Capacitance
L
Packaging
CX-2-Leaded - Tray Pack (Standard)
The CX crystal calibration tolerance is influenced by the effective circuit capacitances, specified as the load capacitance (C ). C is approximately equal to:
L
CL =
1 2
C1 x C2 C C1 + C2 + S
S
NOTE: C and C include stray layout capacitance to ground. C is the stray shunt capacitance between the crystal terminals. In practice, the effective valus of C will be less than that calculated from C , C , and CS values due to the effect of the amplifier output resistance. C should be minimized. The oscillation frequency (f ) is approximately equal to:
L 1 2 S 0
f 0 = f S 1+
S
C1 2(C0 + CL )
Where F = Series resonant frequency of the crystal C = Motional Capacitance C = Shunt Capacitance
1 0
Order Code
Frequency
CX-2
-03
1.0MHz
(A / I)
Temperature Range: C = Commercial I = Industrial M = Military S = Specify
Leads "S" if special Calibration or custom design -02 Tolerance* Blank if standard -03 @ 25C -04 (A) *For other (B) calibrations (C) insert value in ppm

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