Aerospace & Defense Technology - August 2021 - 19

Space Electronics
more distant orbits and longer expected
lifetimes. But with the advent
of " new space " LEO constellations
made up of hundreds and possibly
thousands of smaller satellites (see
Table 4), optimizing SWaP has become
nearly a universal objective.
Size and Weight
Smaller and and lighter devices are
often required as designers pack more
functions into shrinking payloads. But
the size of the package will also depend
on other factors, such as stability
and temperature. Package sizes typically
fall into the following ranges, by
type, and weight is directly related to
size:
* MCXO: 2 " × 1 " × .33 " tall
* OCXOs: By far the largest (~2 " × 2.5 " ¥
1.5 " tall)
* TCXOs: Larger than standard XO Hybrids.
(1 " × 1 " × .200 " tall)
* Space XOs: Ceramic packages as small
as 5mm × 7mm; flatpacks as small as
0.374 " × 0.500 "
* SAWs: .625 " × 625 " flat pack
* Ultra-Miniature XO (for new space): ceramic
SMD as small as 3.2mm × 5 mm
Maximum Power (or Max Current)
As would be expected, devices with
temperature compensation or ovencontrol
circuitry will require more
power than a basic XO package:
* MCXO: < 100mW
* OCXO: 2.7W at room temperature,
4.8W at -40°C
✧ Two temperature points because
the 'oven' part of the ocxo turns on
at lower temperatures, drawing almost
2x the power.
* TCXO: 55 - 80mA
* Space XO: 10 - 50mA
* New Space XO: 2.5mA ~ 40mA
Conclusion
This article presents a broad
overview of the key performance parameters
that must be considered
when choosing the optimum quartz
crystal oscillator for a space application.
Table 5 provides a snapshot of
the Q-Tech space-qualified parts series
and pertinent details.
Regardless of the orbit and the application,
there are numerous degrees of
Aerospace & Defense Technology, August 2021
Intro
Cov
ToC
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+
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A
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19
freedom that will complicate the selection
process. Ultimately, finding the
proper quartz crystal oscillators for
space applications will rely on close cooperation
between the design engineer
and the vendor.
This article was written by Scott Sentz,
Director of Sales & Marketing, and Joshua
Navarrete, Applications Engineer, Q-Tech
Corporation (Culver City, CA). For more
information, visit http://info.hotims.
com/79416-502.
NNEW 9DoF IMUD9Do IMUF
DMU41
È

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Aerospace & Defense Technology - August 2021

Table of Contents for the Digital Edition of Aerospace & Defense Technology - August 2021

Aerospace & Defense Technology - August 2021 - Intro
Aerospace & Defense Technology - August 2021 - Sponsor
Aerospace & Defense Technology - August 2021 - Cov1
Aerospace & Defense Technology - August 2021 - Cov2
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Aerospace & Defense Technology - August 2021 - Cov3
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