Oscillators Glossary
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Standby Current
Amount of current consumed by the oscillator when it is in a standby mode.
Standby Function
A control function like the Enable/Disable function. In this case, the oscillator actually stops oscillating. This type of oscillator draws less current than an Enable/Disable type oscillator (when both are in their disabled states).
Start-up Time
Period from the instant when a voltage is applied to the oscillator until the oscillator output is stabilized.
Supply Voltage
Voltage required for the oscillator to operate within specification.
Surface Mount
Describes a package with pads that mount to the surface of the PCB.
Symmetry
Measurement of the uniformity of the output waveform
T.C.X.O
Abbreviation for "Temperature Compensated Crystal Oscillator." This type of oscillator contains a temperature sensing network that adjusts the output frequency, thereby allowing the frequency to remain constant over a specified temperature range. Very often referred to as precision oscillator.
Tri-State Output
The ability to turn the output on or off using pin # 1 for control. The output will go to high impedance when disabled, which facilitates the use of Auto Test Equipment (ATE). Tri-state can be substituted for non-tri-state if pin #1 is left open or held high.
TTL
Abbreviation for "Transistor-Transistor Logic."
V.C.X.O
Abbreviation for "Voltage Controlled Crystal Oscillator." This type of oscillator contains a network that employs changes in voltage to change the output frequency.
Warm Up
Time required for an oscillator's frequency to settle within a given tolerance of the frequency after several hours.
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