ICS843002BY-31LF

ICS843002BY-31LF Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

The ICS843002BY-31LF is a high-performance Clock Generator, PLL, and Frequency Synthesizer designed for optical interface applications. It is designed to provide low jitter, low power performance with multiple output frequencies. This feature allows the user to optimize the system design by optimizing the available output frequencies and selectable multiplication rates.

Application Field

The ICS843002BY-31LF is designed to address the needs of high-speed optical interface applications such as 40-Gigabit-per-second (Gbps) Fiber Channel, 10-Gigabit Ethernet (GbE), 10-Gigabit Fiber Channel (FC) and other high-speed serial optical transmission systems. Special features of this device include a low-phase-noise reference clock that minimizes jitter for high data rates, programmable power-down mode, very fast frequency select and lock times, and excellent loop-lock performance over junction, ambient temperature, and supply voltage variations. The ICS843002BY-31LF is well suited for applications where system integration and performance are at the highest level of priority.

Working Principle

The ICS843002BY-31LF functions by setting the main external reference frequency (REF) by an external reference such as an external crystal oscillator or another reference clock depending on the desired application. The REF is then multiplied, divided and phase compared to create output clocks with desired frequencies. The input REF is routed to a Phase Frequency Detector (PFD) which compares the REF to the feedback signal from the VCO and determines the necessary correction that is needed to create the desired output frequency. This control loop (which uses the PFD and charge pump) distributes the current to the VCO to achieve the output frequency.

The Voltage Control Oscillator (VCO), driven by the charge pump, will then oscillate at the selected frequency and the output pin will propagate the desired clock frequency. The divider circuit on the output of the VCO allows the user to reduce the clock frequency and still maintain the proper loop lock. This allows for more flexible applications and the user to program multiple output frequencies from one reference.

Conclusion

The ICS843002BY-31LF is a powerful, low-power Clock Generator, Phase Lock Loop, and Frequency Synthesizer designed to address the needs of high-speed optical interface applications. It provides improved jitter performance and multiple output frequencies using a single reference. Thanks to its performance, the ICS843002BY-31LF is an ideal solution for applications where system integration and performance are at a high level of priority.