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Using a discrete crystal as a PLD clock source

Posted: 11 Nov 2009     Print Version  Bookmark and Share

Keywords:clock signal  crystal circuit  board PLD 

Clocks are a necessary part of synchronous PLD designs (e.g. Lattice Semiconductor�s ispMACH 4000ZE and MachXO). Designers will typically use integrated oscillators but there are other, less expensive options. This application note discusses the generation of a clock signal using an inexpensive crystal circuit to minimize board costs.

Discrete crystals are two terminal passive devices that are made from a piezoelectric material. Circuits that use crystals as part of the feedback path are known as crystal oscillator circuits. Crystal oscillator circuits oscillate at a specific frequency that is based upon the mechanical resonance of the crystal device.

View the PDF document for more information.





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