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CX-2C-SM11.0C データシート(PDF) 2 Page - EUROQUARTZ limited

部品番号 CX-2C-SM11.0C
部品情報  CX MINIATURE CRYSTALS
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メーカー  EUROQUARTZ [EUROQUARTZ limited]
ホームページ  http://www.euroquartz.co.uk
Logo EUROQUARTZ - EUROQUARTZ limited

CX-2C-SM11.0C データシート(HTML) 2 Page - EUROQUARTZ limited

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Typical Pierce Oscillator Application
The low profile CX miniature surface-mount crystal is ideal for small,
battery operated portable products. The CX crystal design in a Pierce
oscillator (single inverter) circuit has a very low current consumption
with high stability. A conventional HCMOS Pierce oscillator circuit is
shown below. The crystal is effectively inductive and in a Pi network
with C and C which provides the additional phase-shift necessary
to sustain oscillation. The oscillation frequency (f ) is 15ppm to
150ppm above the crystal’s series resonant frequency (F ).
R is used to limit the crystal’s drive level by forming a voltage
divider between R andC.R also stabilizes the oscillator against
changes in the amplifiers output resistance (R ). R should be
increased for higher voltage operation.
The CX crystal calibration tolerance is influenced by the effective
circuit capacitances, specified as the load capacitance (C .) C is
approximately equal to:
12
0
S
A
A1
A
0A
LL
Drive Level
Load Capacitance
C =
Cx C
C+ C
2
2
1
1
LS
C
+
NOTE: C and C include stray layout capacitance to ground. C is
the stray shunt capacitance between the crystal terminals. In
practice, the effective valus of C will be less than that calculated
fromC,C,and CS values due to the effect of the amplifier output
resistance. C should be minimized.
The oscillation frequency (f ) is approximately equal to:
12
S
L
12
S
0
Where F = Series resonant frequency of the crystal
C = Motional Capacitance
C = Shunt Capacitance
S
1
0
f =
C1
0 fS
2(C+ C)
0L
1+
Circuit Design
Order Code
CX-2
“S” if special
or custom design
Blank if standard
Frequency
SM1
SM2
SM3
Calibration
Tolerance*
@ 25°C
A, B, C
1.0MHz
-SM1
CX-2-SM - Bulk Pack (Standard)
- 16mm tape, 178mm or 330mm reels (Optional)
per EIA 481
- Tray Pack (Optional)
Packaging
Temperature
Range:
C = Commercial
I = Industrial
M = Military
S = Specify
(A /
I )
C = Ceramic Lid
Blank = Glass Lid
*For other calibration
tolerances enter
figure in ppm
Terminations
Designation
SM1
Gold Plated
SM2
Nickel, Solder Plated
SM3
Nickel, Solder Plated and Solder Dipped
Termination
Conventional HCMOS Pierce Oscillator Circuit
CX-2
Buffer
Amplifier
Osc.
Freq. (Fo)
C
C
C5
RB
R)
CX-2-SM
760kHz to 1.35MHz
LOW-PROFILE
SMD CRYSTAL
CX-2-SM
760kHz to 1.35MHz
LOW-PROFILE
SMD CRYSTAL
+44(0)1460 230000
+44(0)1460 230001
sales@euroquartz.co.uk
www.euroquartz.co.uk
Telephone:
Fax:
Email:
Web:
EUROQUARTZ
CX MINIATURE CRYSTALS
Page
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