Nominal frequency

Crystals The conditions specified in the conditions are usually identified on the product housing.

working frequency

Crystal and work circuit generated by the frequency.

Adjust the frequency difference

Under specified conditions, the reference frequency (25 ± 2 ℃) when the operating frequency relative to the nominal frequency of the allowable deviation.

Temperature difference

Under specified conditions, permissible operating frequency over the reference temperature (25 ± 2 ° C) over the operating temperature range

deviation.

Aging rate

Under the specified conditions, the crystal operating frequency allows relative relative changes over time. In terms of year as a unit of time

Annual aging rate.

Static capacitance

Equivalent circuit in parallel with the series arm of the capacitor, also known as the capacitor, usually expressed in C0.

Load capacitance

Together with the crystal, the effective external capacitance of the load resonant frequency fL is determined, usually denoted by CL.

The load capacitance series is: 8PF, 12PF, 15PF, 20PF, 30PF, 50PF, 100PF.

As long as possible should be recommended value: 10PF, 20PF, 30PF, 50PF, 100PF.

Load resonant frequency

Under the specified conditions, the crystal is connected in series or in parallel with a load capacitance, and the combined impedance appears as

Resistive when the frequency of one of the two frequencies. In series load capacitance, the load resonant frequency is the lower of the two frequencies, and when the parallel load capacitance is the higher of the two frequencies.

Dynamic resistance

Equivalent Resistance at Series Resonant Frequency. Indicated by R1.

Load Resonance Resistance

The equivalent resistance exhibited at the load resonant frequency. Expressed in RL.

RL = R1 (1 + C0 / CL) 2

Excitation level

The value of the power consumed by the crystal.

The excitation level options are: 2mW, 1mW, 0.5mW, 0.2mW, 0.1mW, 50μW, 20μW, 10μW, 1μW, 0.1μW, etc.

Baseband

The vibration frequency of the lowest order in the vibration mode.

Overtone

Mechanical harmonic of crystal vibration. The ratio of the overtone frequency to the fundamental frequency is close to an integer multiple but not an integer multiple, which is the main difference between it and the electrical harmonics. Overtone vibration has 3 times overtones, 5 times overtone, 7 times overtone, 9 times overtone and so on.