Low Power Quartz Crystal Oscillator 

quartz crystal oscillator AT-38 3.2~ 60 MHz

Frequency Range: 3.2 ~ 60 MHz

Frequency Tolerance (at 25 oC):  ± 30 ppm, or specify

Frequency Stability Over Operating Temperature Range:  ± 30 ppm, or specify

Operating Temperature Range: - 20 ~ +70 oC, or specify

Shunt Capacitance (C0): 7 pF Max.

Drive Level: 1 ~ 500 μW (100 μW typical)

Load Capacitance: Series, 16 pF, 20 pF, 30 pF, 32 pF, or specify

Aging (at 25 oC) : ± 3 ppm / year Max

Storage Temperature Range: - 40 ~ + 85




quartz crystals are grown by the hydrothermal method, using an autoclave, as shown in the diagram below.
The raw material — small fragments of natural quartz crystal (lasca) — is placed in the bottom of the autoclave and a seed crystal is suspended at the top. The autoclave is filled with an alkaline aqueous solution, sealed and then subject to high temperature and pressure (approximately 350 °C and 90-145 Mpa). At high temperature and pressure, the lasca at the bottom of the autoclave dissolves and the solution becomes saturated. Reducing the temperature at the top of the autoclave relative to the temperature at the bottom creates a convection current within the autoclave and the saturated solution is carried, by this current, towards the cooler upper part of the autoclave. The solution in the upper part of the autoclave becomes super-saturated and crystals begin to reform and grow on the surface of the seed crystal.