PL123E-09SC

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Clock or timing circuits can be used to control various activities in a microprocessor system, such as timing the initiation of various tasks or operations and providing a source of synchronization for the system. Within this category are clock generators, phase-locked loops (PLLs), frequency synthesizers, etc.The PL123E-09SC is a device used primarily in clock and timing circuits. Its application field includes embedded systems, mobile communications, car audio, and digital audio and video. Its operation is based on newly developed Phase Locked Loop (PLL) integrated circuit technology, and is designed to operate from a minimum voltage of 2.5 volts up to a maximum voltage of 5.5 volts.The PL123E-09SC consists of a digitally controlled oscillator (DCO), phase detector (PD), charge pump (CP), loop filter (LF), and gate driver (GD). It is capable of accurately controlling the output frequency while maintaining tight control of the phase noise and oscillator jitter of the loop. The control of the key circuit elements of the PLL is achieved through the use of an external oscillator, which is typically an RC oscillator. This oscillator is connected to the PLL via the DCO input.The PLL is designed so that the output frequency is a multiple of the input frequency. This is achieved by setting the loop stability through the calculation of the internal loop gain, which is determined by the DCO, PD and CP gain settings. The DCO is a controllable element whose frequency is set by a digital code. At the same time, the PD is used to compare the phase difference between the input and output of the DCO and to generate a correction signal for the DCO to adjust its frequency.The CP is used to pump charge into the loop filter and regulate the output frequency based on the phase error between the DCO input and output signals. It is set to respond to the phase error signals generated by the PD and increases the current applied to the loop filter, which in turn adjusts the output frequency.The GD is used to drive the output CLK signal, which is connected to the outside world via the PLL\'s output pin. The output signal is synchronized to the input signal and is usually used as the system clock, which synchronizes the activities in the system.Finally, the LF is used to regulate the internal loop gain of the PLL. It is used to set the loop stability and to ensure that the output frequency remains at a constant level, even if the input frequency fluctuates.In summary, the PL123E-09SC is a device that can be used to generate a stable output frequency from an external oscillator. It consists of DCO, PD, CP, LF, and GD elements, which allow for precise control over the phase noise and oscillator jitter of the loop. Its application field includes embedded systems, mobile communications, car audio, and digital audio and video.

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