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CX4VSM Datasheet(PDF) 2 Page - STATEK CORPORATION

Part No. CX4VSM
Description  Ultra-Miniature Low Profile Surface Mount Quartz Crystal
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Maker  STATEK [STATEK CORPORATION]
Homepage  http://www.statek.com
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CX4VSM Datasheet(HTML) 2 Page - STATEK CORPORATION

   
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STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
YS
TEM
CERTIFIC
AT
01
10103 - Rev C
TERMINATIONS
Designation
Termination
SM1
Gold Plated
SM2
Solder Plated
SM3
Solder Dipped
PACKAGING OPTIONS
CX4VSM
- Tray Pack
- 16mm tape, 7” or 13” reels
(Reference tape and reel data sheet 10109)
SPECIFICATIONS
Specifications are typical at 25
OC unless otherwise noted.
Specifications are subject to change without notice.
Parameters
Fundamental
Overtone
Frequency, (kHz)
32.768
100
200
Motional Resistance R1(kΩ)50
18
2.4
Motional Capacitance C1 (fF)
2.3
1.07
2.2
Quality Factor Q (k)
40
85
140
Shunt Capacitance C0 (pF)
1.1
0.7
1.2
Load Capacitance (pF)*
9
8
5
Turning Point (
oC)*
25
10
29
Standard Calibration Tolerance**
Glass Lid:
30 ppm
100 ppm
1000 ppm
(0.003%)
(0.01%)
(0.1%)
Ceramic Lid:
100 ppm
1000 ppm
10000 ppm
(0.01%)
(0.1%)
(1.0%)
Drive Level
0.5
µW MAX
Temperature Coefficient (k) -0.035 ppm/
OC2
Note: Frequency f at temperature T is related to frequency f0 at
turning point temperature T0 by:
Aging, first year
5 ppm
Shock, survival
5,000 g peak, 0.3 ms, 1/2 sine
Vibration, survival
20 g RMS, 10-2,000 Hz random
Operating Temp. Range
-10
OC to +70OC (Commercial)
-40
OC to +85OC (Industrial)
-55
OC to +125OC (Military)
Storage Temp. Range
-55
OC to +125OC
Max Process Temperature
260
OC for 20 sec.
* Other values available
** Tighter tolerances available
+
_
+
_
+
_
+
_
+
_
+
_
f-f0
=
k(T-T0)
2
f0
HOW TO ORDER CX4VSM CRYSTALS
CX4V
S
C
SM1
32.768K , 100
/
I
C = Ceramic Lid
Blank = Glass Lid
“S” if special or
custom design.
Blank if standard
SM1 = Gold Plated
SM2 = Solder Plated
SM3 = Solder Dipped
Operating Temp. Range:
C= -10
OC to +70OC
I
= -40
OC to +85OC
M= -55
OC to +125OC
S= Customer Specified
Frequency
K = kHz
Calibration
Tolerance
@25
OC
(in ppm)
TYPICAL APPLICATION
FOR A PIERCE OSCILLATOR
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 CD and CG provides the additional
phase shift necessary to sustain oscillation. The oscillation
frequency (f0) is 50 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.
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:
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.
The oscillation frequency (f0) is approximately equal to:
AMPLIFIER
BUFFER
C
G
C
D
R
A
CX4
XTAL
OSC
Freq (f )
O
R
f
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
f0 = fS
[1+
C
1
]
2(C0 + CL)
(2)
Where f
S
= Series resonant frequency of the crystal
C1 = Motional Capacitance
C0 = Shunt Capacitance
CL =
CD x CG
+
CS
CD + CG
(1)


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