RSG CX3SM2

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
0.055
1.40
0.069
1.75
SM3
0.058
1.47
0.072
1.83
0.110 (2.79)
inches (mm)
0.210 (5.33)
IS O
RSG Electronic Components GmbH - Sprendlinger Landstr. 115 - 63069 Offenbach - Germany - www.rsg-electronic.de
YS
90
01
ERT
T E M C IFIC T
A
N
IO
S
10123 - Rev B
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.
Turning Point (T0)**
35OC
+
_
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).
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 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 peak, 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:
* Tighter tolerances available.
** Other values available.
f0 = fS
- Tray Pack
- Tape and Reel
(Reference tape and reel data sheet 10109)
Where f
S
C1
C0
Termination
Gold Plated
Solder Plated
Solder Dipped
S
“S” if special or
custom design.
Blank if Std.
C
SM1
SM1 = Gold Plated
SM2 = Solder Plated
SM3 = Solder Dipped
]
(2)
= Series resonant frequency of the crystal
= Motional Capacitance
= Shunt Capacitance
BUFFER
1.0M,
500
Calibration
Tolerance
@ 25OC
(in ppm)
Frequency
K = kHz
M = MHz
/
AMPLIFIER
RA
OSC
Freq (fO )
M
Operating Temp. Range:
C = -10OC to +70OC
I = -40OC to +85OC
M = -55OC to +125OC
S = Customer Specified
CG
CX3
XTAL
CD
10123 - Rev B
IS O
RSG Electronic Components GmbH - Sprendlinger Landstr. 115 - 63069 Offenbach - Germany - www.rsg-electronic.de
YS
90
01
ERT
T E M C IFIC T
A
N
IO
S
Blank = Glass Lid
C = Ceramic Lid
+ CL)
Rf
HOW TO ORDER CX3SM CRYSTALS
CX3
1
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
TERMINATIONS
Designation
SM1
SM2
SM3
[1 + 2(CC
0
PACKAGING OPTIONS
CX3SM
CD + CG