CX4VSM CRYSTAL
30 kHz to 200 kHz
™
Ultra-Miniature Low Profile
Surface Mount Quartz Crystal
DESCRIPTION
STATEK’s ultra-miniature CX4VSM quartz crystals are
hermetically sealed in surface mount ceramic packages and
custom laser-tuned to frequencies ranging from 30 kHz to
200 kHz. This high quality tuning fork resonator is intended
for use in Pierce (single inverter) oscillators with a maximum
process temperature not to exceed 260
O
C.
FEATURES
actual size
side view
Glass Lid Shown
PACKAGE DIMENSIONS
D
Ultra-miniature, surface mount design
Available with glass or ceramic lid
Hermetically sealed ceramic package
Quartz crystal tuning fork design
High shock and vibration survival
Excellent aging characteristics
Designed for low power applications
Full military testing available
Designed and manufactured in the USA
TYP.
APPLICATIONS
B
C
D
E
A
TOP
F
BOTTOM
MAX.
mm
5.00
1.83
-
0.91
0.51
0.64
inches
0.210
0.085
0.046
-
-
CERAMIC LID
inches
0.050
0.051
0.053
mm
1.27
1.30
1.35
mm
5.33
2.16
1.16
-
-
DIM
A
B
C
D
E
F
DIM “C”
MAX
SM1
SM2
SM3
inches
0.197
0.072
-
0.036
0.020
0.025
Medical Implantable and Non-Implantable Devices
Military Devices
Smart Card
Transponder / Animal Migration
Space Limited Devices
Handheld Battery Operated Devices
Down Hole / Industrial Instrumentation
Computer / Computer Peripherals
see below
GLASS LID
inches
0.045
0.046
0.048
mm
1.14
1.17
1.22
SUGGESTED LAND PATTERN
EQUIVALENT CIRCUIT
0.059 (1.5)
C
0
0.092 (2.3)
1
L
1
C
1
R
1
2
0.160 (4.0)
inches (mm)
10103 - Rev C
S
R
1
Motional Resistance L
1
Motional Inductance
C
1
Motional Capacitance C
0
Shunt Capacitance
YS
ERT
T
E
M
C
IFIC
T
A
N
IO
RSG Electronic Components GmbH - Sprendlinger Landstr. 115 - 63069 Offenbach - Germany - www.rsg-electronic.de
IS
O
90
01
SPECIFICATIONS
TYPICAL APPLICATION
FOR A PIERCE OSCILLATOR
Specifications are typical at 25
O
C unless otherwise noted.
Specifications are subject to change without notice.
Parameters
Fundamental
Overtone
Frequency, (kHz)
Motional Resistance R
1
(kΩ)
Motional Capacitance C
1
(fF)
Quality Factor Q (k)
Shunt Capacitance C
0
(pF)
Load Capacitance (pF)*
Turning Point (
o
C)*
Standard Calibration Tolerance**
Glass Lid:
Ceramic Lid:
Drive Level
30 ppm
(0.003%)
+
_
+
_
+
_
32.768
50
2.3
40
1.1
9
25
100
18
1.07
85
0.7
8
10
200
2.4
2.2
140
1.2
5
29
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 PI-
network circuit with C
D
and C
G
provides the additional
phase shift necessary to sustain oscillation. The oscillation
frequency (f
0
) is 50 to 150 ppm above the crystal’s series
resonant frequency (f
S
).
Drive Level
R
A
is used to limit the crystal’s drive level by forming a
voltage divider between R
A
and C
D
. R
A
also stabilizes the
oscillator against changes in the amplifiers output
resistance (R
0
). R
A
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 (C
L
). C
L
is approximately equal to:
C
L
=
C
D
x C
G
C
D
+ C
G
+
C
S
100 ppm
(0.01%)
1000 ppm
(0.1%)
+
_
1000 ppm
(0.1%)
10000 ppm
(1.0%)
100 ppm
(0.01%)
+
_
+
_
0.5
µW
MAX
Temperature Coefficient (k) -0.035 ppm/
O
C
2
Note: Frequency f at temperature T is related to frequency f
0
at
turning point temperature T
0
by: f-f
0
2
=
k(T-T
0
)
f
0
Aging, first year
5 ppm
Shock, survival
Vibration, survival
Operating Temp. Range
5,000 g peak, 0.3 ms, 1/2 sine
20 g RMS, 10-2,000 Hz random
-10
O
C to +70
O
C (Commercial)
-40
O
C to +85
O
C (Industrial)
-55
O
C to +125
O
C (Military)
-55 C to +125 C
260
O
C for 20 sec.
O
O
(1)
NOTE: C
D
and C
G
include stray layout to ground and C
S
is the stray shunt capacitance between the crystal
terminal. In practice, the effective value of C
L
will be less
than that calculated from C
D
, C
G
and C
S
values because
of the effect of the amplifier output resistance. C
S
should
be minimized.
The oscillation frequency (f
0
) is approximately equal to:
f
0
=
f
S
1
+
Where f
S
C
1
C
0
C
1
2(C
0
+ C
L
)
Storage Temp. Range
Max Process Temperature
* Other values available
** Tighter tolerances available
[
]
(2)
= Series resonant frequency of the crystal
= Motional Capacitance
= Shunt Capacitance
TERMINATIONS
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
Designation
SM1
SM2
SM3
CX4VSM
Termination
Gold Plated
Solder Plated
Solder Dipped
- Tray Pack
- 16mm tape, 7” or 13” reels
(Reference tape and reel data sheet 10109)
R
f
BUFFER
OSC
Freq (f
O
)
PACKAGING OPTIONS
AMPLIFIER
R
A
HOW TO ORDER CX4VSM CRYSTALS
CX4V
S
C
C = Ceramic Lid
Blank = Glass Lid
“S” if special or
custom design.
Blank if standard
SM1
32.768K , 100
Frequency
K = kHz
Calibration
Tolerance
@25
O
C
(in ppm)
/
I
C
G
SM1 = Gold Plated
SM2 = Solder Plated
SM3 = Solder Dipped
Operating Temp. Range:
C = -10
O
C to +70
O
C
I
= -40
O
C to +85
O
C
M = -55
O
C to +125
O
C
S = Customer Specified
CX4
XTAL
C
D
10103 - Rev C
S
YS
ERT
T
E
M
C
IFIC
T
A
N
IO
RSG Electronic Components GmbH - Sprendlinger Landstr. 115 - 63069 Offenbach - Germany - www.rsg-electronic.de
IS
O
90
01
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