Voltage Controlled Crystal Oscillator (English: Voltage Controlled Crystal Oscillator), often identified as VCXO, referred to as voltage controlled crystal. This product is already a complete active oscillator. After the voltage is applied, the output will output HCMOS/TTL/SINE WAVE/LVPECL/LVDS/ECL/MCL/HCSL and other level signals according to the set parameters. The output frequency signal will follow. A change in the voltage at the voltage control terminal produces a variation over a range of nominal frequencies. The product is mainly composed of quartz wafer, pedestal, outer casing, conductive adhesive, silver/gold, RC, IC, varactor diode and other materials. According to the lead condition, it can be divided into two types: in-line (with lead) and surface mount (without lead).