CX-2-SM2FREQ(B/C) [EUROQUARTZ]
Quartz Crystal, QUARTZ CRYSTAL RESONATOR, 0.76 MHz - 1.35 MHz, HERMETIC SEALED, LEADLESS, SMD, 2 PIN;型号: | CX-2-SM2FREQ(B/C) |
厂家: | EUROQUARTZ LIMITED |
描述: | Quartz Crystal, QUARTZ CRYSTAL RESONATOR, 0.76 MHz - 1.35 MHz, HERMETIC SEALED, LEADLESS, SMD, 2 PIN |
文件: | 总2页 (文件大小:99K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
CX MINIATURE CRYSTALS
EUROQUARTZ
Telephone:
Fax:
+44(0)1460 230000
+44(0)1460 230001
sales@euroquartz.co.uk
www.euroquartz.co.uk
Page
CX-2-SM
760kHz to 1.35MHz 1 of 2
Email:
Web:
LLOOWW--PPRROOFFIILLEE
SSMMDD CCRRYYSSTTAALL
Extensional mode
High shock resistance
Designed for low-power applications
Compatible with hybrid or PC board packaging
Low ageing
Full military environmental testing available
Ideal for battery operated applications
General Description
The miniature CX-2-SM quartz crystal is a high quality leadless
device suitable for mounting on printed circuit boards or hybrid
substrates. The CX-2-SM is hermetically sealed in a rugged,
leadless ceramic package. The crystal has been designed for
surface-mounting on printed circuit boards or hybrid circuits. The
crystal is manufactured using a photo-lithographic process,
yielding consistently high quality production parts.
Specification
Frequency Range:
Functional Mode:
Calibration Tolerance*:
760kHz to 1.35MHz
Extensional
1
A
B
C
±0.05% (±500ppm)
±0.1%
±1.0%
2
A
I
H
G
3
F
Load Capacitance:
7pF
D
Motional Resistance (R ):
Motional Capacitance (C ):
Quality Factor (Q):
5k max.
1.2fF
150k
B
C
E
Terminal 1 is electrically connected to terminal 3
Outline
Shunt Capacitance (C ):
Drive Level:
Turning Point (T )**:
1.0pF
3 W max.
35°C
CX-2-SM Package Dimensions
Note: Frequency (f) deviation from frequency (f ) @ turning point
temperature (T ):
Typical
(mm)
Maximum
(mm)
f-fo
Dimension
k(T-To)
=
fo
-0.035ppm/°C
±5ppm max.
Temperature Coefficient:
Ageing, first year:
Shock, survival:
Vibration, survival:
Operating Temperature:
A
B
C
D
E
6.60
2.39
-
6.99
2.74
1000g 0.3ms, ½ sine
10g rms, 20-1,000Hz random
-10°~+70°C (commercial)
-40°~+85°C (industrial)
-55°~+125°C (military)
-55°C~+125°C
see below
1.14
0.89
1.50
1.27
2.67
3.94
5.33
1.75
Storage Temperature:
Process Temperature:
F
1.52
260°C for 20 seconds
G
H
I
2.92
Specifications are typical at 25°C unless otherwise indicated.
4.19
*
**
Tighter frequency calibration available
Other turning point available
5.59
Dimension
“C”
Glass Lid
(mm max.)
Ceramic Lid
(mm max.)
SM1
SM2
SM3
1.65
1.70
1.78
1.91
1.96
2.03
Equivalent Circuit
L
R
Solder Pad Layout
C
C
1
2
2.67
1
2
2.87
R
C
Motional Resistance
Motional Capacitance
L
Motional Inductance
Shunt Capacitance
0.6
C
CX MINIATURE CRYSTALS
EUROQUARTZ
Telephone:
Fax:
+44(0)1460 230000
+44(0)1460 230001
sales@euroquartz.co.uk
www.euroquartz.co.uk
Page
CX-2-SM
760kHz to 1.35MHz 2 of 2
Email:
Web:
LLOOWW--PPRROOFFIILLEE
SSMMDD CCRRYYSSTTAALL
Circuit Design
Typical Pierce Oscillator Application
Conventional HCMOS Pierce Oscillator Circuit
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
Amplifier
Buffer
Osc.
Freq. (Fo)
R
C
Drive Level
R is used to limit the crystal’s drive level by forming a voltage
divider between R and C . R also stabilizes the oscillator against
changes in the amplifiers output resistance (R ). R should be
increased for higher voltage operation.
C
C
CX-2
Load Capacitance
The CX crystal calibration tolerance is influenced by the effective
circuit capacitances, specified as the load capacitance (C .) C is
approximately equal to:
C x C
C + C
C
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
from C , 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:
C
f
f
=
1+
2(C + C )
Where F = Series resonant frequency of the crystal
C = Motional Capacitance
C = Shunt Capacitance
Terminations
Termination
Designation
Packaging
CX-2-SM - Bulk Pack (Standard)
- 16mm tape, 178mm or 330mm reels (Optional)
per EIA 481
SM1
SM2
SM3
Gold Plated
Nickel, Solder Plated
- Tray Pack (Optional)
Nickel, Solder Plated and Solder Dipped
Order Code
C = Ceramic Lid
Blank = Glass Lid
Frequency
CX-2
( A /
I )
-SM1 1.0MHz
“S” if special
or custom design
Blank if standard
Temperature
Range:
C = Commercial
I = Industrial
M = Military
S = Specify
SM1
SM2
SM3
Calibration
Tolerance*
@ 25°C
A, B, C
*For other calibration
tolerances enter
figure in ppm
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