What is oscillator aging and what are the aging specifications for this oscillator series?
Aging is the systematic change in frequency with time due to internal changes in the MEMS oscillator. Aging is often expressed as a maximum value in parts per million per year [ppm/year]. The rate of aging is typically logarithmic in nature. The following factors effect MEMS oscillator aging: adsorption and desorption of contamination on the surfaces of the MEMS resonator, stress relief of the mounting and bonding MEMS structures, and material outgassing. At a rated operating temperature of 25C, this series of products ages at a rate of less than 1ppm over the first year, logarithmically declining each year there after. The aging parameters can be found on the EMS series specification sheets.
Aging is the systematic change in frequency with time due to internal changes in the crystal and/or oscillator. Aging is often expressed as a maximum value in parts per million per year [ppm/year]. The rate of aging is logarithmic in nature. The following factors effect crystal aging: adsorption and desorption of contamination on the surfaces of the quartz, stress relief of the mounting and bonding structures, material outgassing, and seal integrity. At a rated operating temperature of 25°C, this series of products typically age at a rate of less than ±3ppm over the first year, ±1ppm over the following year, logarithmically declining each year there after. The aging parameters can be found on the EPS series specification sheets.
