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参数资料
| 型号： | EX385-DAF-107F-16.384MHZ |
| 厂商： | VECTRON INTERNATIONAL |
| 元件分类： | OCXO, clock |
| 英文描述： | OCXO, CLOCK, 16.384 MHz, HCMOS OUTPUT |
| 文件页数： | 3/7页 |
| 文件大小： | 770K |
| 代理商： | EX385-DAF-107F-16.384MHZ |
Mechanically, the hybrid circuit and crystal
assembly are suspended directly over a
highly insulating structure to minimize heat
energy loss through conduction. In addition,
the entire assembly is thermally insulated to
the enclosure by vacuum at a pressure level
of 10-6 torr. Based on the steady state
thermal conduction calculation, this package
design resulted in a thermal resistance of
>300 degrees C/watt.
The EMXO m anuf acturing p ro cess is
interesting and a process flow diagram is
shown below in figure 2.
Figure 2. EMXO Process Flow Diagram
Substrates are fabricated with thick film
screen printing techniques with each
deposition layer subjected to three different
process stages - print, dry and fire. Crystal
clips are attached to the gold conductor trace
on a substrate with high thermal conductivity.
All active and passive components are
mounted on the substrate using a conductive
adhesive and then moved to a convection
oven for curing. After the cure process, the
hybrid is cleaned to remove organic and non-
organic contaminants. Wires are bonded on
the hybrid circuit as interconnects. The hybrid
circuits are then attached to the cold-weld
package with adhesive. Finally, blank crystals
are mounted onto the clips and tuned to the
nominal frequency needed, by an evaporation
process, to a typical accuracy of 1 ppm. The
units are then cold weld sealed. The oven
itself is heated by direct thermal conduction
applied to a heat conductive substrate.
This "Open Blank" EMXO concept is shown
and compared to conventional OCXO
construction, in Figure 3 below.
Figure 3, Open Blank EMXO concept
In f i g ur e 3 above, 1 ,2 and 3 r e f l ect
conventional OCXO construction while 4 is the
EMXO. It shows the major elements of the
SDIL EMXO. Only one substrate is used and
all the elements are heated. The oscillator is
essentially a CMOS gate type with an
additional varactor diode and LC trap for
overtone select. The resonator is a 3rd
Overtone, AT or doubly rotated cut as required
by the application, both of which offer superior
aging performance when compared to a
traditional fundamental resonator.
1. Evacuated
Crystal in
Metal Case
2. Electronics
on PC board
3. Can & Cover
& Polyfoam
Insulation
4. Evacuated oscil-
lator (EMXO) using:
*Open Crystal Blank
*Thick Film Microcir-
cuit
*Insulation via a
Vacuum
*All in 4 pin DIP
(1) Substrate
Fabrication
(2) TF
Resistor Trim
(3) Crystal
Clip Attach
(4) Component
Mount
(5) Plasma
Clean
(6) Wire
Bond
(7) Snap
Substrate
(8) CW
Header Attach
(9) Epoxy
Cure
(10) Wire
Bond I/O
(11) Electrical
Test
(12)Xtal Blank
Mount
(13) Vacuum
Cure
(14) Oven
Temp Set
(15)Mount F.S
Component
(16) Epoxy
Cure
(17) UV /
Ozone Clean
(18)Vacuum
Bake-out
(24) Pack
& Ship
(23) Cover
Marking
(19) Freq
Fine-Tune
(20) Cold
Weld
(22) Final
Temp Test
(21) Leak
Test
Vectron International 267 Lowell Road, Hudson, NH 03051 Tel: 1-88-VECTRON-1 Web: www.vectron.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EX-385-DAF-147-A-10.000 | 制造商:VECTRON 制造商全称:Vectron International, Inc 功能描述:4 Pin DIP & SMD Evacuated Miniature Crystal Oscillator |
| EX-385-DAF-147-F-10.000 | 制造商:VECTRON 制造商全称:Vectron International, Inc 功能描述:4 Pin DIP & SMD Evacuated Miniature Crystal Oscillator |
| EX-385-DAF-147-G-10.000 | 制造商:VECTRON 制造商全称:Vectron International, Inc 功能描述:4 Pin DIP & SMD Evacuated Miniature Crystal Oscillator |
| EX-385-DAF-507-A-10.000 | 制造商:VECTRON 制造商全称:Vectron International, Inc 功能描述:4 Pin DIP & SMD Evacuated Miniature Crystal Oscillator |
| EX-385-DAF-507-F-10.000 | 制造商:VECTRON 制造商全称:Vectron International, Inc 功能描述:4 Pin DIP & SMD Evacuated Miniature Crystal Oscillator |
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