CX-3C-SM31.0C [EUROQUARTZ]
CX MINIATURE CRYSTALS; CX微型晶体
| 型号： | CX-3C-SM31.0C |
| 厂家： | 
EUROQUARTZ LIMITED |
| 描述： | CX MINIATURE CRYSTALS |
| 文件： | 总2页 (文件大小：100K) |
| 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-3-SM
800kHz ttoo 11..3355MMHHzz
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Extensional mode
Ideal for use with microprocessors
Designed for low power applications
Compatible with hybrid or PCB mounting
Low ageing
General Description
Full military environmental testing available
Ideal for battery operated applications
CX-3-SM quartz crystals are leadless devices designed for surface-
mounting on printed circuit boards or hybrid circuits. Hermetically
sealed in a rugged, ceramic package, the crystals are produced
utilizing a photo-lithographic process giving excellent repeatability
and consistent high quality.
Specification
Frequency Range:
Functional Mode:
Calibration Tolerance*:
800kHz to 1.35MHz
Extensional
D
A:
B:
C:
±0.05% (±500ppm)
±0.1%
±1.0%
A
D
D
Load Capacitance:
7pF
Motional Resistance (R ):
Motional Capacitance (C ):
Quality Factor (Q):
5k max.
1.2fF
150k
B
C
E
Outline
Shunt Capacitance (C ):
Drive Level:
Turning Point (T )**:
Temperature Coefficient (k):
Note: Frequency (f) deviation from frequency (f0) @ turning point
1.0pF
3 W max.
35°C
CX-3-SM Package Dimensions
-0.035ppm/°C
Typical
(mm)
Maximum
(mm)
Dimension
temperature (t0) =
f-fo
fo
k(T-To)
=
A
B
6.73
2.62
-
7.11
2.90
Ageing, first year:
Shock:
Vibration, survival:
Operating Temperature:
±5ppm max.
1,000g peak, 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
C
D
E
see below
1.52
1.27
1.32
1.57
Storage Temperature:
Max. Process Temperature:
260°C for 20 seconds
Dimension
“C”
Glass Lid
(mm max.)
Ceramic Lid
(mm max.)
Specifications are typical at 25°C unless otherwise indicated.
SM1
SM2
SM3
1.47
1.52
1.60
1.75
1.80
1.88
*
**
Closer frequency calibration available
Other turning point available
Equivalent Circuit
Terminations
L
R
C
C
1
2
Termination
Designation
SM1
SM2
SM3
Gold Plated
Nickel, Silver Plated
R
C
Motional Resistance
Motional Capacitance
L
Motional Inductance
Shunt Capacitance
Nickel, Solder Plated and Solder Dipped
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-3-SM
800kHz ttoo 11..3355MMHHzz
LLOOWW--PPRROOFFIILLEE
MMIINNIIAATTUURREE
2 of 2
Email:
Web:
SSMMDD CCRRYYSSTTAALL
Circuit Design
Conventional HCMOS Pierce Oscillator Circuit
Typical Pierce Oscillator Application
R
The low profile CX miniature surface-mount crystal is ideal for small,
battery operated portable products. The CX crystal designed 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 ).
Amplifier
Buffer
Osc.
Freq. (Fo)
R
C
C
C
CX-2
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.
Solder Pad Layout
1.78
3.05
5.46
Load Capacitance
The CX crystal calibration tolerance is influenced by the effective
circuit capacitances, specified as the load capacitance (C .) C is
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.
Packaging
CX-3H-SM- Bulk Pack (Standard)
-
16mm tape, 178mm or 330mm reels (Optional)
per EIA 481
Tray Pack (Optional)
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
Order Code
C = Ceramic Lid
Blank = Glass Lid
Frequency
CX-3
( A /
I )
-SM1
1.0MHz
Temperature
Range:
C = Commercial
I = Industrial
M = Military
S = Specify
“S” if special
or custom design
Blank if standard
SM1
SM2
SM3
Calibration
Tolerance*
@ 25°C
A, B, C
*For other calibration
tolerances enter
figure in ppm
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