Main Specifications

(1) Nominal Frequency: The center frequency or nominal value of the frequency output by the oscillator.
 
(2) Frequency Accuracy: The deviation of the oscillator output frequency relative to the nominal frequency at room temperature (25℃±2℃).
 
(3) Frequency Adjustment Range: The maximum allowable frequency deviation of the oscillator output frequency relative to the measured value at 25℃ within a specified temperature range.
 
(4) Load Resonant Frequency (fL): One of the two frequencies when a crystal is connected in series or parallel with a load capacitor under specified conditions and the combination impedance appears resistive (producing resonance). When the load capacitor is connected in series, the load resonant frequency is the lower of the two frequencies, and when it is connected in parallel, it is the higher of the two frequencies.
 
(5) Shunt Capacitance (C0): The capacitance connected in parallel with the series arm in the equivalent circuit, also known as the shunt capacitance, usually represented by C0.
 
(6) Operating Temperature Range: The temperature range in which the oscillator output frequency and its various characteristics meet the specifications.
 
(7) Frequency Temperature Stability: The maximum allowable frequency deviation without implicit reference temperature or with implicit reference temperature, working under specified temperature range and nominal power supply and load.
 
(8) Load Capacitance (CL): The effective external capacitance that determines the load resonant frequency (fL) with the crystal, represented by CL. Common load capacitances include 8pF, 10pF, 12pF, 15pF, 18pF, 20pF, 30pF, etc.
 
(9) Drive Level: The characteristic value of the power consumed when the crystal is in operation. The available drive levels include 2mW, 1mW, 0.5mW, 0.2mW, 0.1mW, 50μW, 20μW, 10μW, 1μW, 0.1μW, etc.
 
(10) Aging Rate: The relative change in output frequency within a specified time.
 
(11) Fundamental Frequency: The vibrational frequency of the lowest mode of the vibration pattern.
 
(12) Overtone: The mechanical harmonic of crystal vibration. The overtone frequency is close to an integer multiple but not an exact multiple of the fundamental frequency, which is the main difference from electrical harmonics. Overtone vibration includes 3rd overtone, 5th overtone, 7th overtone, 9th overtone, etc.