How To Choose Communicational Equipments
For Crystal Oscillators
    Crystal Oscillators include 4 types, they are Temperature-compensated crystal oscillators (TCXO), oven-controlled crystal oscillators (OCXO), voltage-controlled crystal oscillators (VCXO), and Simple-Packaged Crystal Oscillator (SPXO) or Crystal Oscillator (XO).
    It is difficult to estimate the ratio of quality and price of later phase when you select products in the first phase. So we can select according to the following advice:
    1) Sum up the basic demands
    2) Make sure the 'whole functions' of Crystal Oscillator'
    3) The stability of products in the range of temperature at work
    4) Aging and other factors
    5) The demands relative to whole life
    For example, if you select the fax machine in the office, by the above advice, you can choose TCXO and VCXO, whose work temperature range is 0oC to 50oC and stability is ±10~±20PPM,or SPXO, which has lower price.
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