How do the EPO™ series oscillators work?
The EPO™ series oscillators consist of a fundamental mode crystal controlled oscillator and an EPROM integrated circuit. The EPROM contains programmable functions that control the operating characteristics of the device (i.e. output frequency, output drive, power down versus tri-state, 5.0Vdc versus 3.3Vdc supply voltage, and duty cycle). At the heart of the EPO™ EPROM is a programmable high resolution PLL (Phase Locked Loop, see Figure 1). The PLL consists of a reference counter divider, a feedback counter multiplier, and an output divider. Utilizing a proprietary design and an exclusive programming methodology, the EPO™ series oscillator is programmed with specific values that define the operating characteristics of the oscillator.
