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CX4 Folha de dados(PDF) 2 Page - STATEK CORPORATION

Nome de Peças CX4
Descrição Electrónicos  Ultra-Miniature Low Profile Surface Mount Quartz Crystal
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Fabricante Electrônico  STATEK [STATEK CORPORATION]
Página de início  http://www.statek.com
Logo STATEK - STATEK CORPORATION

CX4 Folha de dados(HTML) 2 Page - STATEK CORPORATION

  CX4_08 Datasheet HTML 1Page - STATEK CORPORATION CX4_08 Datasheet HTML 2Page - STATEK CORPORATION  
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CX4
S
C
SM1
1.8432M , 500
/
I
HOW TO ORDER CX4 CRYSTALS
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 250 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
CG
CD
RA
CX4
XTAL
OSC
Freq (f )
O
Rf
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
f0 = fS
[1+
C1
]
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)
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
10161 Rev B
C = Ceramic Lid
Blank = Glass Lid
“S” if special or
custom design.
Blank if standard
SM1 = Gold Plated
SM2 = Solder Plated
SM3 = Solder Dippe
d
SM4 = Solder Plated (Lead Free)
SM5 = Solder Dipped (Lead Free)
Operating Temp. Range:
C = -10OC to +70OC
I = -40OC to +85OC
M = -55OC to +125OC
S = Customer Specified
Frequency
K = kHz
M = MHz
Calibration
Tolerance
@25OC
(in ppm)
SPECIFICATIONS
Specifications are typical at 25OC unless otherwise noted.
Specifications are subject to change without notice.
Parameters
Fundamental
Overtone
Frequency, (Hz)
600 K 1.0 M 1.4 M 1.8432 M 2.4576 M
Motional Resistance, R1 (Ω)
300
400
600
500
1000
Motional Resistance, R1 MAX
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
Turning Point, T02
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:
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
260OC for 20 sec.
1. Tighter tolerances available
2. Other values available
NOTE: All values subject to change without notice.
+
_
+
_
+
_
+
_
+
_
+
_
f-f0 = k(T-T
0)
2
f0
PACKAGING OPTIONS
CX4
- Tray Pack
- Tape and Reel
(Reference tape and reel data sheet 10109)
TERMINATIONS
Designation
Termination
SM1
Gold Plated
SM2
Solder Plated
SM3
Solder Dipped
SM4
Solder Plated (Lead Free)
SM5
Solder Dipped (Lead Free)


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