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CX1CSM3 データシート(PDF) 2 Page - RSG Electronic Components GmbH

部品番号 CX1CSM3
部品情報  530 kHz to 2.1 MHz Low Profile, Miniature Surface Mount Quartz Crystal
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メーカー  RSG [RSG Electronic Components GmbH]
ホームページ  http://www.rsg-electronic.de
Logo RSG - RSG Electronic Components GmbH

CX1CSM3 データシート(HTML) 2 Page - RSG Electronic Components GmbH

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RSG Electronic Components GmbH - Sprendlinger Landstr. 115 - 63069 Offenbach - Germany - www.rsg-electronic.de
YS
TEM C
ERTIF
IC
A
T
01
TYPICAL APPLICATION
FOR A PIERCE OSCILLATOR
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 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 CX 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
CX1
XTAL
OSC
Freq (f )
O
R
f
10129 - Rev B
SPECIFICATIONS
Specifications are typical at 25
OC unless otherwise noted.
Specifications are subject to change without notice.
Parameters
Fundamental
Overtone
Frequency Range, (Hz)
555 k 614 k 1.0 M 1.4 M 1.8432 M 2.1M
Motional Resistance,R1(Ω)
600
275
500
775
300
475
Motional Resistance,R1 MAX
3 k
Motional Capacitance,C1 (fF) 2.5 3.6 2.0 1.5
2.8
2.6
Quality Factor, Q (k)
170
260
190
100
110
70
Shunt Capacitance,C0 (pF)
1.2
1.3
1.1
1.0
1.3
1.3
Calibration Tolerance*
500 ppm (0.05%)
1000 ppm (0.1%)
10000 ppm (1.0%)
Drive Level
3
µW MAX
Load Capacitance**
7 pF
Turning Point (T0)**
35
OC
Temperature Coefficient (k) -0.035 ppm/
OC2
Note: Frequency f at temperature T is related to frequency f0
at turning point temperature T0 by:
Function Mode
Extensional
Aging, first year
5 ppm MAX
Shock, survival
750 g peak, 0.3 ms, 1/2 sine
Vibration, survival
10 g RMS, 20-1,000 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.
*Tighter tolerances available.
** Other values available.
+
_
+
_
+
_
HOW TO ORDER CX1SM CRYSTALS
CX1
S
C
SM1
1.0M,
500
/ M
f-f0
=
k(T-T0)
2
f0
TERMINATIONS
Designation
Termination
SM1
Gold Plated
SM2
Solder Plated
SM3
Solder Dipped
PACKAGING OPTIONS
CX1SM
- Tray Pack
- Tape and Reel
(Reference tape and reel data sheet 10109)
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)
“S” if special or
custom design.
Blank if Std.
Blank = Glass Lid
C = Ceramic Lid
SM1 = Gold Plated
SM2 = Solder Plated
SM3 = Solder Dipped
Frequency
K = kHz
M = MHz
Calibration
Tolerance
@ 25
OC
(in ppm)
Operating Temp. Range:
C = -10
OC to +70OC
I
= -40
OC to +85OC
M = -55
OC to +125OC
S = Customer Specified


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