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Fox Electronics is a leading source for quartz crystals used
in clock and oscillators, as well as other frequency control devices. These
components are commonly used throughout the electronics industry. Please click
here to go directly to the Fox Electronics web site to get more information
about
qz crystals, oscillators and other
frequency control devices.
Quartz crystal oscillators
are often used in microprocessor and microcontroller applications to generate
the clock pulses upon which all subsequent timing is based.
Specialty
crystal oscillators, such as TCXOs and VCXOs are found in communication
applications as the local crystal oscillator of synthesizers, mixers and phase
lock loops. In all cases,
crystal
oscillator specs use terms that may be unfamiliar to many design engineers,
but are nevertheless essential to selecting the most appropriate oscillator
model. For more information about
specifying
quartz crystal oscillators, please click.
A good place to start when selecting a crystal oscillator is
the type of load the
oscillator
is intended to drive in the application. Most oscillator designs are optimized
to drive a particular type of load, whether they are TTL, CMOS, ECL or analog
loads. For CMOS and HCMOS devices, the clock-input pin typically has an input
capacitance specification, and this is the load that the crystal oscillator
must drive.
The most common digital applications call for 5 Volt HCMOS clock
inputs. If the intention is to drive several loads in parallel, the capacitance
values are added together. A good rule-of-thumb for an HCMOS load is 5pF per
gate.
We invite you to learn more about quartz crystal oscillators
and frequency control devices at our
Fox
Electronics web site, or use the links below to go directly to our products.
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