ICS87931BYILFT

Differential - Input:Output:	Yes/No
Base Part Number:	ICS87931
Supplier Device Package:	32-LQFP (7x7)
Package / Case:	32-LQFP
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	3.135 V ~ 3.465 V
Divider/Multiplier:	Yes/Yes
Frequency - Max:	150MHz
Series:	--
Ratio - Input:Output:	2:6
Number of Circuits:	1
Output:	LVCMOS, LVTTL
Input:	LVCMOS, LVTTL
PLL:	Yes with Bypass
Type:	Clock Multiplier, Zero Delay Buffer
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The ICS87931BYILFT is a clock generator that is used to generate clocks in a variety of applications and it employs a phase-locked loop (PLL) to synthesize and multiply clock finite-state machines of varying frequency. It is designed to be used in synchronous data communications applications such as computer systems, communication systems and server applications.

Applications

The ICS87931BYILFT can be used in a wide range of applications such as digital systems and digital clock recovery in addition to network synchronization. It offers synchronization and pulse width modulation for clock sources and clock frequency translations, as well as high speed clock synthesis from a low frequency reference. For instance, it can be used to generate a stable clock signal which can be used to drive synchronous data links such as SONET and SDH digital synchronous communication systems. In these systems, the ICS87931BYILFT clock generator can be used to monitor the rate and phase of the received input digital bitstreams to generate the appropriate output clock frequency, phase and width.In addition, the ICS87931BYILFT can be used in FPGAs, microcontrollers and other digital logic components. The clock generator can be used to generate high-speed clock signals needed to drive synchronous digital systems and components. In these cases, the ICS87931BYILFT clock generator provides a clean source of clocking signals with minimal jitter and low noise.

Working Principle

The ICS87931BYILFT Clock Generator employs a PLL to synthesize, multiply and divide the frequency of a stable reference clock. This clock generator has an integrated Voltage Controlled Oscillator (VCO) that supports an input reference clock ranging from 50Hz to 1250MHz. The VCO is activated by the output of a PLL loop filter, which helps to adjust the output clock frequency and phase as per the input reference.The PLL loop comprises two components, namely a phase detector and a loop filter. The phase detector (PD) constantly compares the phase of the incoming reference clock to the phase of the VCO’s output. If there is any difference between the two signals, the PD sends a control signal to the VCO, which adjusts the frequency and phase of the output clock until the phase difference is minimized. The loop filter acts as an amplifier to multiply the control signal generated by the phase detector and provide the VCO with a stable control voltage. Once the phase difference is minimized, the VCO output is synchronized with the reference clock, thereby providing an output clock signal with minimal jitter and low noise. The ICS87931BYILFT also contains a programmable divider to divide the output by a factor of either 1 or 2. This divider is used to extend the output frequency range of the clock generator and make it suitable for different applications.

Conclusion

The ICS87931BYILFT is a highly versatile clock generator that is used for a variety of clock generation applications. It employs a phase-locked loop (PLL) to synthesise and multiply finite-state machines of different frequencies. The PLL includes a phase detector and a loop filter to monitor the rate and phase of the received input digital bitstreams and generate the appropriate output clock frequency, phase, and width. In addition, the ICS87931BYILFT has an integrated Voltage Controlled Oscillator (VCO) and programmable frequency divider to extend the output frequency range of the clock generator and make it suitable for different purposes.

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