Datenblatt

CX-2 CRYSTAL
760 kHz to 1.35 MHz
TM
Miniature Quartz Crystal
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, one-fourth the size of an eightpin mini-DIP. The CX-2 crystal is manufactured using the
STATEK-developed photolithographic process, and was
designed utilizing the experience acquired by producing
millions of crystals for industrial, commercial, military and
medical applications.
actual size
FEATURES
Extensional mode
Ideal for use with microprocessors
Designed for low power applications
Compatible with hybrid or PC board packaging
Low aging
Full military testing available
PACKAGE DIMENSIONS
Ideal for battery operated applications
-02 End Lead
Designed and manufactured in the USA
The CX crystal is hermetically sealed in a ceramic package.
Normal handling and soldering precautions for small, low
thermal mass parts are adequate when installing or testing CX
crystals. CX crystals may be wave soldered, with proper
precaution taken to avoid desoldering the leads. A slow
machine rate or too high a pre-heat temperature or solder bath
temperature can damage the crystals. Lead to package
solder interface temperature should not exceed 175oC,
glass lid to package seal rim temperature should not
exceed 210oC. If the seal rim reaches temperatures above the
maximum specified, the package may lose its hermeticity. Loss
of hermeticity results in a frequency decrease and motional
resistance increase.
.094
(2.39)
2
.260
(6.60)
1
.200
(5.08)
.205
(5.21)
A
R1
2
3
2
.210
(5.33)
3
A
.050(1.27)
-04 Side Lead
.260
(6.60)
INCHES (mm)
.094
(2.39)
1.Terminal 1 is electrically connected
internally to terminal 3.
C0
C1
1
3
1
2
Notes:
EQUIVALENT CIRCUIT
L1
.260
(6.60)
.094
(2.39)
PACKAGE HANDLING
1
-03 Side Lead
.210
(5.33)
2.Lead dimensions
Width: .013” (.33mm) Typical
Thickness: .007” (.18mm) Typical
3.A = Glass Lid .080 (2.03) max.
Ceramic Lid .095 (2.41) max.
.100
(2.54)
A
R1 Motional Resistance L1 Motional Inductance
C1 Motional Capacitance C0 Shunt Capacitance
10139 - Rev C
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
TYPICAL APPLICATION
FOR A PIERCE OSCILLATOR
SPECIFICATIONS
Specifications are typical at 25OC unless otherwise noted.
Specifications are subject to change without notice.
Frequency Range
760 kHz - 1.35 MHz
Functional Mode
Extensional
Calibration Tolerance*
A
B
C
+
_
0.05% ( +_ 500ppm)
0.1%
+
_ 1.0%
+
_
Load Capacitance
7 pF
Motional Resistance (R1)
5 kV MAX
Motional Capacitance (C1)
1.2fF
Quality Factor (Q)
150 k
Shunt Capacitance (C0)
1.0 pF
Drive Level
3 mW MAX.
Turning Point (TO)**
35OC
The low profile CX miniature leaded crystal is ideal for
small, high density, battery operated portable products.
The CX crystal designed in a Pierce oscillator (single
inverter) circuit provides very low current consumption
and high stability. A conventional CMOS Pierce oscillator
circuit is shown below. The crystal is effectively inductive
and in a PI-network circuit with CD and CG provides the
additional phase shift necessary to sustain oscillation.
The oscillation frequency (fO) is 15 to 150 ppm above
the crystal’s series resonant frequency (fs).
Drive Level
RA is used to limit the crystal’s drive level by forming a
voltage divider between RA and CD. RA also stabilizes
the oscillator against changes in the amplifiers output
resistance (R0). RA should be increased for higher
voltage operation.
Temperature Coefficient (k) -0.035 ppm/OC2
Note: Frequency (f) deviation from frequency (fO) @ turning
point temperature (TO);
f-fO = k(T-T )2
O
fO
Load Capacitance
The CX crystal calibration tolerance is influenced by the
effective circuit capacitances, specified as the load
capacitance (CL). CL is approximately equal to:
CL =
CD x CG
CD + CG
(1)
+ CS
Aging, first year
5ppm MAX.
Shock
1000g peak, 0.3 msec.,1/2 sine
Vibration, survival
10g rms, 20-1,000 Hz random
Operating Temperature
-10OC to +70OC Commercial
-40OC to +85OC Industrial
-55OC to +125OC Military
NOTE: CD and CG include stray layout to ground and Cs
is the stray shunt capacitance between the crystal
terminal. In practice, the effective value of CL will be less
than that calculated from CD, CG and CS values because
of the effect of the amplifier output resistance. CS should
be minimized.
Storage Temperature
-55OC to +125OC
The oscillation frequency (fO) is approximately equal to:
Max Process Temperature
See package handling
[
fO = fS 1 +
* Tighter frequency calibration available.
** Other turning point available.
HOW TO ORDER CX-2-LEADED CRYSTALS
CX-2
“S” if special
or custom
design.
Blank if Std.
-03
1.0 MHz
Leads
-02
-03
-04
Frequency
*Other calibration fill in ppm.
(
Calibration
Tolerance*
@ 250C
(A)
(B)
(C)
A
/
I
Where f
S
C1
C0
C1
2(C0 + CL)
]
(2)
= Series resonant frequency of the crystal
= Motional Capacitance
= Shunt Capacitance
)
Temp. Range:
C = Commercial
I = Industrial
M = Military
S = Specify
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
Rf
BUFFER
AMPLIFIER
CS
PACKAGING
RA
OSC
Freq (fO)
Contact factory for
design guidelines
CX-2-Leaded -Tray Pack (Standard)
CG
CX-1
CX-2
CD
10139 - Rev C
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
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