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参数资料
| 型号： | ACVTX1018A-FREQ-E30-H5-OUT23 |
| 厂商： | ABRACON CORP |
| 元件分类： | XO, clock |
| 英文描述： | TCVCXO, CLOCK, 1 MHz - 26 MHz, CMOS/TTL OUTPUT |
| 封装： | COMPACT, DIP-4 |
| 文件页数： | 6/6页 |
| 文件大小： | 177K |
| 代理商： | ACVTX1018A-FREQ-E30-H5-OUT23 |
29 Journey Aliso Viejo, CA 92656 USA
(949) 448-7070
FAX: (949) 448-8484
E-MAIL:
abinfo @ abracon.com INTERNET ADDRESS: www.abracon.com
ABRACON IS
ISO 9001 / QS 9000
CERTIFIED
CORPORA TION
ABRACON
-60 -
CRYSTAL OSCILLATORS
RECOMMENDED HANDLING AND LAYOUT
I. ELECTRICAL
1) Supply voltage
Most of Abracon oscillators utilize a CMOS technology ASIC
chip with extreme ESD sensitive. When apply power to the
oscillator unit, be sure to check the polarities before con-
necting to the terminals. Reversed polarity connections may
cause the unit to be damaged electrically (dead) or mechan-
ically (burn, color change). Pin 1 is usually identified by a
black dot marked on cover.
Be sure to apply voltage to the oscillator not exceeding the
maximum specified value which is typically 7Vdc max. for
most CMOS IC. Applying under rating voltage could result
to no or unstable oscillation.
Although many metal can oscillators have built-in bypass
capacitors, it is a good practice to add an external bypass
capacitor 0.01F
near the Vdd ter-
minal. The exter-
nal capacitor is
used as an over
impressed voltage
and overcurrent
protective device.
Figure 1
shows a typical layout for a surface-mount crystal oscillator.
2) Load impedance
Oscilloscope impedance shall be greater than 1 M
with
probe capacitance less than 15pF. The load applied shall
include probe capacitance. All lead length should be kept
as short as possible especially ground trace. Output trace
from oscillator output to the load (next IC) shall be kept
short and avoided layout in parallel or cross with another
hot signal trace. Stray capacitance and inductance have
major effects on output impedance of the oscillator unit and
shall be minimized.
3) Output frequency
Output frequency shall be measured with a precision fre-
quency counter using a reference external time base.
Make sure to stabilize the crystal oscillator (warm-up)
before recording the final frequency value, especially on
high frequency and high current units.
II. MECHANICAL
1) Vibration and shock
Do not apply or cause sudden shock and vibration exceed-
ing its maximum specifications to the unit. Severe drop or
hit with a hard object could damage the unit electrically and
mechanically. Please check the unit if dropped before
assembling or using.
2) Mounting
The following precautions shall be applied during mounting
through-hole crystal oscillators:
Do not force spreading the terminals into socket or
PCB holes. This will avoid breaking the glass insulation on
terminals.
Do not apply excessive soldering heat or soldering
duration on terminals.
When bending leads for surface-mount, be very care-
ful to use appropriate tool keeping a safe distance between
the terminal base and the bent area.
The following precautions shall be applied to all surface-
mount oscillators:
Use the appropriate reflow condition as recommended
on the unit specification. Please make sure to not exceed
the peak temperature, its maximum duration, the number of
exposures, the rate of temperature change vs. time, etc.
3) Cleaning
Do not use solvents not recommended to clean to avoid
discoloration or damage on ink marking permanency.
Some solvents, which contain Chlorine, may cause some
color discoloration on some metallic cover.
Do not exceed the maximum recommended temperature
when cleaning.
III. PACKAGING
Although an anti-static protection circuit is built-in the ASIC,
excessive static electricity level may damage the unit.
Abracon uses conductive packing materials for all oscillators.
By sure to ground with ESD strap before handling the device.
IV. HANDLING UNUSED TERMINALS
Some Abracon oscillators include Tristate function. Although
there is an internal pull-up resistor to prevent floating, it is rec-
ommended to terminate the tristate terminal to Vdd with a
resistor of 100 k
in series.
V. STORING
Please store all units at normal temperature and humidity.
High humidity may cause deterioration to units. Avoid storing
over a long period. Please perform visual and electrical
inspections before using once the units are stored over a long
period.
Figure 1
22355 Abracon CORX 2-29.qxd
3/6/00
6:55 AM
Page 60
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