Programmable oscillators cover a range of crystal driven oscillators and can be XO, VCXO, and sometimes TCXO. They offer users the flexibility to request parts programmed to their desired frequency, offering frequency options that wont normally be available and often with smaller lead times. As well as frequency options, some programmable parts offer a selection of the output type; LVCMOS, LVDS or LVPECL can be requested. Stability of these programmed clocks are similar to that of standard oscillators.
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