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%
5k
W
max.
Motional Resistance (R
):
1.2fF
Motional Capacitance (C
):
150k
Quality Factor (Q):
1.0pF max.
Shunt Capacitance (C
):
3
m
W max.
Drive Level:
35°C
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, ½ sine
10g rms 20 - 1,000Hz
-10°~+70°C (commercial)
-40°~+85°C (industrial)
-55°~+125°C (military)
-55°C~+125°C
Storage Temperature:
Lead to Package temp. not to
Process Temperature:
exceed 175°C
Glass lid to package seal rim
temp. not to exceed 210°C
Specifications are typical at 25°C unless otherwise indicated.
* Closer calibration available
** Other turning point available
Ageing, first year:
Shock, survival:
Vibration, survival:
Operating Temperature:
fo
L
Motional Inductance
C
Motional Capacitance C
Shunt Capacitance
R
Motional Resistance
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
R
B
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)
C
5
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
C
L
=
1
2
C
1
x C
2
C
C
1
+ C
2
+
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
C
1
2(C
0
+ C
L
)
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
@ 25°C
-04
(A)
*For other (B)
calibrations (C)
insert value
in ppm
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