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CX2SM 参数 Datasheet PDF下载

CX2SM图片预览
型号: CX2SM
PDF下载: 下载PDF文件 查看货源
内容描述: 低调微型表面贴装石英晶体 [Low Profile Miniature Surface Mount Quartz Crystal]
分类和应用: 晶体石英晶体
文件页数/大小: 2 页 / 452 K
品牌: STATEK [ STATEK CORPORATION ]
 浏览型号CX2SM的Datasheet PDF文件第1页  
TYPICAL APPLICATION  
FOR A PIERCE OSCILLATOR  
SPECIFICATIONS  
Specifications are typical at 25OC unless otherwise noted.  
Specifications are subject to change without notice.  
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 150 ppm above the  
crystal’s series resonant frequency (fS).  
Frequency Range  
Functional Mode  
Calibration Tolerance*  
760 kHz - 1.35 MHz  
Extensional  
+_ 500 ppm (0.05%)  
+_ 1000 ppm (0.1%)  
+_ 10000 ppm (1.0%)  
7 pF  
Load Capacitance  
Motional Resistance (R1)  
5 kMAX  
Drive Level  
Motional Capacitance (C1) 1.2fF  
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.  
Quality Factor (Q)  
Shunt Capacitance (C0)  
Drive Level  
150 k  
1.0 pF  
W MAX  
35OC  
3
µ
Turning Point (T )**  
0
Temperature Coefficient (k) -0.035 ppm/OC2  
Load Capacitance  
Aging, first year  
Shock, survival  
Vibration, survival  
Operating Temp. Range  
5 ppm MAX  
1000 g peak, 0.3 ms,1/2 sine  
10 g RMS, 20-1,000 Hz random  
-10OC to +70OC (Commercial)  
-40OC to +85OC (Industrial)  
-55OC to +125OC (Military)  
-55OC to +125OC  
The CX crystal calibration tolerance is influenced by the  
effective circuit capacitances, specified as the load  
capacitance (CL). CL is approximately equal to:  
CD x CG  
=
+
(1)  
CL  
CS  
CD + CG  
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.  
Storage Temp. Range  
Max Process Temperature 260OC for 20 sec.  
Note: Frequency f at temperature T is related to frequency f0  
at turning point temperature T0 by:  
2
f-f0  
f0  
=
k(T-T )  
0
The oscillation frequency (f0) is approximately equal to:  
* Tighter frequency calibration available.  
** Other turning points available.  
C1  
=
+
(2)  
f0 fS  
1
[
]
2(C0 + CL)  
TERMINATIONS  
Where  
= Series resonant frequency of the crystal  
= Motional Capacitance  
= Shunt Capacitance  
fS  
C1  
C0  
Designation  
SM1  
SM2  
Termination  
Gold Plated  
Solder Plated  
Solder Dipped  
CONVENTIONAL CMOS  
PIERCE OSCILLATOR CIRCUIT  
SM3  
PACKAGING OPTIONS  
Rf  
CX2SM - Tray Pack  
-16mm tape, 7” or 13” reels  
(Reference tape and reel data sheet 10109)  
BUFFER  
OSC  
Freq (fO)  
RA  
AMPLIFIER  
CX2  
HOW TO ORDER CX2SM CRYSTALS  
CX2  
S
C
SM1  
1.0M,  
500  
/
M
Frequency  
K = kHz  
M = MHz  
Blank = Glass Lid  
C = Ceramic Lid  
Operating Temp. Range:  
C
I
= -10OC to +70OC  
= -40OC to +85OC  
CG  
CD  
Calibration  
Tolerance  
@ 25OC  
SM1 = Gold Plated  
SM2 = Solder Plated  
SM3 = Solder Dipped  
M = -55OC to +125OC  
“S” if special or  
custom design.  
Blank if Std.  
S
= Customer Specified  
(in ppm)  
10135 - Rev B  
E
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com