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| 型号： | SGDNLA-8.448 |
| 厂商： | VECTRON INTERNATIONAL |
| 元件分类： | XO, clock |
| 英文描述： | VCXO, CLOCK, 8.448 MHz, CMOS/TTL OUTPUT |
| 文件页数： | 3/6页 |
| 文件大小： | 158K |
| 代理商： | SGDNLA-8.448 |
S-Type Voltage Controlled Crystal Oscillator
Vectron International
166 Glover Avenue, Norwalk, CT 06856 Tel: 1-88-VECTRON-1 http://www.vectron.com
Qualification Conformance
The S-Type has undergone the following Mil-Std qualification.
Table 3. Environmental Compliance
Parameter
Conditions
Mechanical Shock
MIL-STD-883C 2002.3, TEST B
Mechanical Vibration
MIL-STD-883C 2007.1, TEST C
Solderability
MIL-STD-883C 2003.5
Gross and Fine Leak
MIL-STD-883C 1014.7, 100% Tested
Resistance to Solvents
MIL-STD-883C 2016
Handling Precautions
Although ESD protection circuitrry has been designed into the the S-Type, proper precautions should be
taken when handling and mounting. VI employs a human body model and a charged-device model (CDM)
for ESD susceptibility testing and design protection evaluation. ESD thresholds are dependent on the
circuit parameters used to define the model. Although no industry wide standard has been adopted for the
CDM, a standard HBM of resistance=1.5Kohms and capacitance = 100pF is widely used and Therefore
can be used for comparison purposes.
Table 4. ESD Ratings
Model
Minimum
Human Body Model
1500 V (Mil-STD-883D, Method 3015, Class 1)
Charged Device Model
1500 V
Absolute Pull Range (APR) Specification
The frequency deviation of the S-Type VCXO is specified in terms of Absolute Pull Range (APR). APR
provides the user with a guaranteed specification for minimum available frequency deviation over all
operating conditions. Operating conditions include operating temperature range, power supply variation,
differences in output loading and changes due to aging.
An S-Type VCXO with an APR of +/-50 ppm will track a +/-50 ppm reference source over all
operating conditions. The same device will typically demonstrate a Total Pull capability of 150 to
350 ppm. Absolute Pull Range (APR) is specified by the fourth character of the product code in Table 6.
Please see Vectron’s web site, www.vectron.com, for the APR Application Note.
Oscillator Aging
Quartz stabilized oscillators typically exhibit a small shift in output frequency during aging. The major
factors which lead to this shift are changes in the mechanical stress on the crystal and mass-loading of
foreign material on the crystal.
As the oscillator ages, relaxation of the crystal mounting stress or transfer of environmental stress through
the package to the crystal mounting arrangement can lead to frequency variations. VI has minimized these
two effects through the use of a miniature AT-Cut strip resonator crystal which allows a superior mounting
arrangement and results in minimal relaxation and almost negligible environmental stress transfer.
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