CX-1SC-SM31.0C [EUROQUARTZ]
CX MINIATURE CRYSTALS; CX微型晶体型号: | CX-1SC-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-1-SM
530kHz ttoo 22..11MMHHzz
1 of 2
Email:
Web:
MMIINNIIAATTUURREE SSMMDD CCRRYYSSTTAALL
Extensional mode
Ideal for use with microprocessors
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-1-SM crystals in leadless ceramic packages have
been designed for surface-mounting on printed circuit boards or
hybrid circuits. Hermitically sealed in a rugged, miniature ceramic
package, the CX-1-SM crystal is manufactured using a photo-
lithographic process.
Specification
D
Frequency Range:
Functional Mode:
Calibration Tolerance*:
530kHz to 2 .1MHz
Extensional
A
A
B
±0.05% (±500ppm)
±0.1%
±1.0%
E
D
C
Load Capacitance:
7pF
B
C
E
Motional Resistance (R ):
Motional Capacitance (C ):
Quality Factor (Q):
3k max.
1.2fF
150k
Outline
Shunt Capacitance (C ):
Drive Level:
Turning Point (T )**:
1.0pF
3 W max.
35°C
CX-1-SM Package Dimensions
Note: Frequency (f) deviation from frequency (f ) @ turning point
temperature (T ):
Typical
(mm)
Maximum
(mm)
Dimension
f-fo
fo
k(T-To)
=
A
B
8.00
3.56
-
8.38
3.94
Ageing, first year:
Shock, survival:
Vibration, survival:
Operating Temperature:
±5ppm max.
750g 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
1.40
1.14
1.52
1.78
Storage Temperature:
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
1.65
1.70
1.78
1.78
1.83
1.90
*
**
Tighter frequency calibration available
Other turning point available
Equivalent Circuit
Solder Pad Layout
L
R
C
C
1
2
1.78
4.06
6.86
R
C
Motional Resistance
Motional Capacitance
L
Motional Inductance
Shunt Capacitance
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-1-SM
530kHz ttoo 22..11MMHHzz
2 of 2
Email:
Web:
MMIINNIIAATTUURREE SSMMDD CCRRYYSSTTAALL
Circuit Design
Conventional HCMOS Pierce Oscillator Circuit
Typical Pierce Oscillator Application
R
Amplifier
Buffer
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 ).
Osc.
Freq. (Fo)
R
C
C
C
CX-1
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.
Terminations
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:
Termination
Designation
C x C
C + C
C
C
=
+
SM1
SM2
SM3
Gold Plated
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.
Nickel, Silver Plated
Nickel, Solder Plated and Solder Dipped
The oscillation frequency (f ) is approximately equal to:
Packaging
C
f
f
CX-1-SM - Tray Pack (Standard)
16mm tape, 178mm or 330mm reels (Optional)
per EIA 481
=
1+
2(C + C )
-
Where F = Series resonant frequency of the crystal
C = Motional Capacitance
C = Shunt Capacitance
Order Code
Blank = Glass Lid
C = Ceramic Lid
Frequency
CX-1
-SM1 1.0MHz
(A / I)
SM1
SM2
SM3
“S” if special
or custom design
Blank if standard
Calibration
Tolerance*
@ 25°C
(A)
(B)
Temperature
Range:
C = Commercial
I = Industrial
M = Military
S = Specify
*For other
calibrations
(C)
insert value
in ppm
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