Why is the “pull range” not specified on the custom Ecliptek crystals?
The “pull range” parameter is a VCXO specification, not a crystal specification. The custom Ecliptek ECX specification does not specify the “pull range” parameter. Ecliptek specifies the “r” ratio, defined as the C0/C1 ratio (See figure 1 below). This ratio is defined as the crystal shunt capacitance divided by the crystal motional capacitance. This method of specification is outlined in MAN05 and is a method of expressing the crystal attributes that control VCXO frequency pullability. As shown in figure 1, the change in frequency decreases as the r ratio increases (assuming a fixed load capacitance, CL) for a parallel resonant crystal. Figure 1: Frequency vs.
Related Questions
- Who do I contact if I have additional technical questions about the use of the Ecliptek custom quartz crystals integrated with the ICS VCXO ICs?
- What are the "Environmental and Mechanical Specifications" for the custom Ecliptek quartz crystals?
- What is "crystal aging" and what are the aging specifications for these custom Ecliptek crystals?
