Datenblatt

CX3SM CRYSTAL
800 kHz to 1.35 MHz
Low Profile Miniature Surface Mount Quartz Crystal
DESCRIPTION
actual size
The CX3SM quartz crystals are leadless devices designed
for surface mounting on printed circuit boards or hybrid
substrates. They are hermetically sealed in a rugged,
miniature ceramic packages and are designed specifically for
manufacturing temperatures up to 260OC.
side view
Glass Lid Shown
PACKAGE DIMENSIONS
FEATURES
D
Extensional mode
Ideal for use with microprocessors
Designed for low power applications
Compatible with hybrid or PC board packaging
TOP
A
BOTTOM
E
Low aging
Full military testing available
Ideal for battery operated applications
D
Designed and manufactured in the USA
E
B
C
EQUIVALENT CIRCUIT
C0
1
L1
C1
TYP.
R1
R1 Motional Resistance L1 Motional Inductance
C1 Motional Capacitance C0 Shunt Capacitance
2
inches
mm
inches
mm
A
0.263
6.68
0.270
6.86
B
0.097
2.46
0.104
2.64
C
-
-
D
0.052
1.32
0.058
1.47
E
0.030
0.76
0.035
0.89
DIM “C“”
SUGGESTED LAND PATTERN
0.070 (1.78)
MAX.
DIM
GLASS LID
see below
CERAMIC LID
MAX
inches
mm
inches
mm
SM1
0.053
1.35
0.067
1.70
SM2/SM4
0.055
1.40
0.069
1.75
SM3/SM5
0.058
1.47
0.072
1.83
0.110 (2.79)
inches (mm)
0.210 (5.33)
10123 - 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
800 kHz - 1.35 MHz
Functional Mode
Extensional
Calibration Tolerance
+
_
Load Capacitance
500 ppm (0.05%)
1000 ppm (0.1%)
+
_ 10000 ppm (1.0%)
7 pF
Motional Resistance (R1)
5 kΩ MAX
Motional Capacitance (C1)
1.2 fF
Quality Factor (Q)
150 k
Shunt Capacitance (C0)
1.0 pF
Drive Level
3 µW MAX.
1
+
_
Turning Point (T0)
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.
35OC
2
The low profile CX miniature surface mount 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 (f0) is 15 to 150 ppm above the crystal’s series
resonant frequency (fS).
Temperature Coefficient (k) -0.035 ppm/OC2
Note: Frequency f at temperature T is related to frequency f0
at turning point temperature T0 by: f-f0
2
= k(T-T0)
f0
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
(1)
+ CS
Aging, first year
5 ppm MAX
Shock, survival
1000 g, 0.3 ms,1/2 sine
Vibration, survival
10 g RMS, 20-1,000 Hz random
Operating Temp. Range
-10OC to +70OC (Commercial)
-40OC to +85OC (Industrial)
-55OC to +125OC (Military)
Storage Temp. Range
-55OC to +125OC
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.
Max Process Temperature
260OC for 20 sec.
The oscillation frequency (f0) is approximately equal to:
1. Tighter tolerances available.
2. Other values available.
f0 = fS
PACKAGING OPTIONS
CX3SM
[1 + 2(CC
- Tape and Reel
(Reference tape and reel data sheet 10109)
TERMINATIONS
Where f
S
C1
C0
S
Blank = Glass Lid
C = Ceramic Lid
“S” if special or
custom design.
Blank if Std.
SM1
1.0M
,
500
Frequency Calibration
Tolerance
K = kHz
@ 25OC
M = MHz
(in ppm)
SM1 = Gold Plated
SM2 = Solder Plated
SM3 = Solder Dipped
SM4 = Solder Plated (Lead Free)
SM5 = Solder Dipped (Lead Free)
]
(2)
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
Termination
Gold Plated
Solder Plated
Solder Dipped
Solder Plated (Lead Free)
Solder Dipped (Lead Free)
C
+ CL)
= Series resonant frequency of the crystal
= Motional Capacitance
= Shunt Capacitance
Rf
BUFFER
HOW TO ORDER CX3SM CRYSTALS
CX3
1
0
- Tray Pack
Designation
SM1
SM2
SM3
SM4
SM5
CD + CG
/
AMPLIFIER
I
Operating Temp. Range:
C = -10OC to +70OC
I = -40OC to +85OC
M = -55OC to +125OC
S = Customer Specified
CG
CX3
XTAL
RA
OSC
Freq (fO )
CD
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
10123 - Rev C
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