STATEK CX4_08

CX4 CRYSTAL
Fundamental Mode: 600 kHz to 1.4 MHz
Overtone: 1.8432 MHz - 2.5 MHz
Ultra-Miniature Low Profile
Surface Mount Quartz Crystal
XX
X
X
S
DESCRIPTION
STATEK’s CX4 quartz crystals are hermetically sealed in an
ultra-miniature low profile surface mount ceramic package.
This high quality quartz resonator forms the basis of a stable
oscillator.
actual size
side view
Ceramic Lid Shown
PACKAGE DIMENSIONS
FEATURES
D
Designed for low power applications in this frequency
range
Smallest available package in this frequency range
TOP
A
Hermetically sealed ceramic package
BOTTOM
F
Excellent aging characteristics
Full military testing to MIL-PRF-3098 available
Designed and manufactured in the USA
B
E
D
C
APPLICATIONS
TYP.
Medical
Pacemaker, defibrillator and hearing aid
Industrial, Computer & Communications
PCMCIA (FAX, Modem and LAN)
Smart Card
Military & Aerospace
Airborne hybrid computer
DIM
inches
mm
inches
mm
A
0.197
5.00
0.210
5.33
B
0.072
1.83
0.085
2.16
C
-
-
D
0.036
0.91
0.046
1.16
E
0.020
0.51
-
-
F
0.025
0.64
-
-
DIM “C”
Low power system clock
Hybrid multi-chip modules
EQUIVALENT CIRCUIT
GLASS LID
L1
C1
see below
CERAMIC LID
MAX
inches
mm
inches
mm
SM1
0.045
1.14
0.050
1.27
SM2/SM4
0.046
1.17
0.051
1.30
SM3/SM5
0.048
1.22
0.053
1.35
SUGGESTED LAND PATTERN
C0
1
MAX.
0.059 (1.5)
R1
R1 Motional Resistance L1 Motional Inductance
C1 Motional Capacitance C0 Shunt Capacitance
2
0.092 (2.3)
0.160 (4.0)
inches (mm)
10161 Rev B
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.
Parameters
Fundamental
Frequency, (Hz)
600 K 1.0 M
Motional Resistance, R1 (Ω)
300
Overtone
1.4 M 1.8432 M 2.4576 M
400
600
Motional Resistance, R1 MAX
500
1000
3KΩ
Motional Capacitance, C1 (fF)
3.5
2.0
1.3
3.5
1.5
Quality Factor, Q (k)
250
200
150
80
45
Shunt Capacitance, C0 (pF)
1.0
0.8
0.7
1.0
0.8
Standard Calibration
+
_
500 ppm ( 0.05%)
Tolerance1
+
_
1000 ppm ( +_ 0.1%)
+
_
10000 ppm ( +_ 1.0%)
Drive Level
3 µW MAX
Load Capacitance, CL2
7pF
2
Turning Point, T0
35OC
Temperature Coefficient, k
-0.035 ppm/OC2 TYP
Note: Frequency f at temperature T is related to frequency f0 at
turning point temperature T0 by: f-f0
2
= k(T-T0)
f0
Functional Mode
Extensional
Aging, first year
5ppm MAX
Shock, survival
1500 g, 0.3 ms, 1/2 sine
Vibration, survival
20 g RMS, 10-2,000 Hz random
Operating Temp. Range
-10OC to +70OC (Commercial)
-40OC to +85OC (Industrial)
-55OC to +125OC (Military)
Storage Temp. Range
-55OC to +125OC
+
_
Max Process Temperature
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.
Load Capacitance
The CX4 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
The oscillation frequency (f0) is approximately equal to:
[
f0 = fS 1 +
Where f
S
C1
C0
NOTE: All values subject to change without notice.
TERMINATIONS
Termination
Gold Plated
Solder Plated
Solder Dipped
Solder Plated (Lead Free)
Solder Dipped (Lead Free)
(1)
+ CS
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.
260OC for 20 sec.
1. Tighter tolerances available
2. Other values available
Designation
SM1
SM2
SM3
SM4
SM5
The CX4 family of surface mount crystals are ideal for
small, high density, battery operated portable products. The
CX4 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 PInetwork circuit with CD and CG provides the additional
phase shift necessary to sustain oscillation. The oscillation
frequency (f0) is 50 to 250 ppm above the crystal’s series
resonant frequency (fS).
C1
2(C0 + CL)
]
= Series resonant frequency of the crystal
= Motional Capacitance
= Shunt Capacitance
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
Rf
BUFFER
PACKAGING OPTIONS
CX4
(2)
- Tray Pack
- Tape and Reel
AMPLIFIER
RA
OSC
Freq (fO )
(Reference tape and reel data sheet 10109)
HOW TO ORDER CX4 CRYSTALS
CX4
S
C
SM1
C = Ceramic Lid
Blank = Glass Lid
SM1 = Gold Plated
“S” if special or SM2 = Solder Plated
custom design. SM3 = Solder Dipped
Blank if standard SM4 = Solder Plated (Lead Free)
SM5 = Solder Dipped (Lead Free)
1.8432M , 500
Frequency
K = kHz
M = MHz
/
I
Calibration Operating Temp. Range:
Tolerance C = -10OC to +70OC
@25OC I = -40OC to +85OC
(in ppm) M = -55OC to +125OC
S = Customer Specified
CG
CX4
XTAL
CD
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
10161 Rev B