S-Type Voltage Controlled Crystal Oscillator
Oscillator Aging
Mass-loading on the crystal generally results in a frequency decrease and is typically due to out-gassing of
material within a hermetic package or from contamination by external material in a less than hermetic
package. VI has minimized the impact of mass loading by ensuring hermetic integrity and minimizing out-
gassing by limiting the number of internal components through the use of ASIC technology.
Under normal operating conditions with an operating temperature of 40°C, the S-Type will typically exhibit
2 ppm aging in the first year of operation. The device will then typically exhibit 1 ppm aging the following
year with a logarithmic decline each year thereafter.
220
183
150
60s.
60-90s.
45-60s.
Time(s)
Figure 4. Suggested IR profile
Figure 5. Tape and Reel
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MICROSEMI [ Microsemi ]
