The lck4973 has output frequencies of up to 240 mhz and skews of less than 250 ps, making it ideal for synchronous systems. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational. Leveraging internal clock synthesizer ic technology, pllbased xos can be programmed to support a wide range of frequencies. Product index integrated circuits ics clocktiming clock buffers, drivers. Pllbased clock driver costs two to five times as much as a gatebased clock driver.
Designing with multi pll and spreadspectrum clocks in digital entertainment equipment page 1 of 5. Lck4972 lowvoltage pll clock driver arrow electronics. One of the outputs is fed back to the pll at the feedback input resulting. How to select the right pllbased oscillator for your. Lowjitter processindepentdent dll and pll based on self. Jitter transfer functions for the reference clock jitter. More than ten years ago, the frequency control industry introduced phase locked loop pllbased oscillators, an innovation that pioneered several features previously unavailable with traditional crystal oscillators xos. A phase interpolatorbased cdr is an alternative circuit architecture developed by rambus which provides multiple advantages compared to pllbased cdrs.
How to select the right pllbased oscillator for your timing. Buy 874001agi02lft idt, learn more about 874001agi02lft pll based clock driver, 874001 series, 1 true outputs, 0 inverted outputs, pdso20, 6. Pll based clock driver, 2304 series, 4 true outputs, 0 inverted outputs, cmos, pdso8, soic8. Idt54fct88915tt100lb low skew pllbased cmos clock driver with 3state.
Jitter transfer functions for the reference clock jitter in a serial link. One of the outputs is fed back to the pll at the feedback input resulting in essentially zero delay. Each driver will measure the phase difference a fraction of the distance around the lap between himself and the other race car. This is important for the multicore platforms where only one core needs to set up the clock. May 02, 1995 a pll based deskewed clock generator which may be fully integrated on a microprocessor is disclosed. The data integrity that the serdes o ers is predominantly due to the clock and data recovery circuit cdr employed within the design. Achieving low jitter in pll and dll designs can be dif. Clock driver and oscillator manufacturers do not artificially generate. M202021 vcso based clock pll preliminary information, tel 508 8525400 integrated circuit systems, inc. A 150450mhz, alldigital phase lockedloop adpll in a 0. The resolution determines the frequency increment size.
It provides low skew clock distribution for high performance pcs and workstations. Ck00 clock synthesizerdriver design guidelines page 6 1. A phaselocked loop or phase lock loop pll is a control system that generates an output. If the accuracy and speed of the pll is not needed, other solutions can be used. Clocks are, with varying degrees of accuracy, phaselocked timelocked to a master clock. The ck00 is intended to be applicable to a wide variety of system. The fct388915t uses phase lock loop technology to lock the frequency and phase of outputs to the input reference clock. Understanding jitter requirements of pllbased processors ee261 page 2 of 9 here we presume that at time t0 of the measurement, the edge of the jittered clock aligns with the edge of the ideal clock. Lck4973 lowvoltage pll clock driver features fully integrated pll. With output frequencies of up to 200 mhz and maximum output skews of 150 ps, the mpc9350 is ideal for the most demanding clock tree designs. Introduction this document provides technical specifications for development of the ck00 class of clock components, based on requirements of the intel pentium 4 processor and other intel architecture ia platforms.
With output frequencies of up to 125 mhz, and output skews of 100 ps, the pck953 is ideal for the most demanding clock tree designs. February 2003 lowvoltage pll clock driver lck4973 pin information continued pin descriptions table 1. Idt54fct88915tt100lb datasheet low skew pllbased cmos. A dualoutput integrated llc resonant controller and led driver ic with pllbased automatic duty control article in journal of power electronics 126 november 2012 with 91 reads. When mr oe is set high, the pll will have been disturbed and. Phaselocked loop pll architecturebased frequency synthesizer for clock gen. Consider a typical pll which is based on a voltage controlled oscillator vco. Oe i output enable controls for banks 1, 2 and 3 active low. Low skew pllbased cmos clock driver with 3state, idt74fct88915tt3py datasheet, idt74fct88915tt3py circuit, idt74fct88915tt3py data sheet. For example, a 10 mbs receiver that uses a 100 mhz clock has a 0. A pllbased timing module that generates timing signals by multiplying an external reference a zerodelay buffer used on a memory module to buffer the clock signal pll resolution the resolution of a pll is based on the number of bits in the m and n counter.
Pll block diagram 18 perrott a phase locked loop pll is a negative feedback system where an oscillatorgenerated signal is phase and. Clocktiming clock buffers, drivers integrated circuits. Idts general purpose clock generators are phaselocked loop pllbased. Pll clock generators, frequency multipliers, and phaselocked. Motorola mc88915fn55 pll based clock driver pqcc28 qty. Pin descriptions pin symbol type io description 1, 15, 24, 30, 35, 39, 47, 51 v ss ground ground.
A phase interpolator based cdr is an alternative circuit architecture developed by rambus which provides multiple advantages compared to pll based cdrs. A major contribution is the identification of a design figure of merit, which is independent of the number of stages in the. Ctsfrequency controls cypress semiconductor corp diodes incorporated linear technologyanalog devices maxim integrated microchip technology nexperia usa inc. The fct88915tt uses phaselock loop technology to lock the frequency and phase of outputs to the input reference clock.
With output frequencies up to 200 mhz and output skews of 150 ps, the device meets the needs of the most demanding clock tree applications. Understanding jitter requirements of pll based processors ee261 page 2 of 9 here we presume that at time t0 of the measurement, the edge of the jittered clock aligns with the edge of the ideal clock. Theory and applications mike li, wavecrest andy martwick, intel gerry talbot, amd jan wilstrup, teradyne. Ad9528 low jitter clock generator linux driver analog. Designing with multipll and spreadspectrum clocks in digital entertainment equipment by ashwini raman, product marketing manager, cypress semiconductor corp. Adi clock ics integrate pll cores, dividers, phase offset, skew adjust, and clock drivers in small chip. Phase locked loop pll based clock and data recovery. Pll clock generator integrated with microprocessor intel. The cspu877a is a pll based clock driver that acts as a zero delay buffer to distribute one differential clock input pairclk, clk to 10 differential output pairs y 0. This type of cdr uses a pll or dll to implement a reference loop which accepts an input reference clock signal and produces a set of high speed clock signals, used as reference phases, spaced evenly across 360 degrees. Idt, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors.
Isolating analog and digital power supplies in tis pllbased cdc devices 5 ferrite beads clock drivers typically produce switching noise. Chapter 6 pll and clock generator the dsp56300 core features a phase locked loop pll clock generator in its central processing module. Low voltage pll clock driver mpc9351 mpc9351 revision 7 31416 1 2016 integrated device technology, inc. The oscillator generates a periodic signal, and the phase detector compares the phase of that signal with the phase of the input periodic signal, adjusting the oscillator to keep the. Buy si53115a01agm silicon labs, learn more about si53115a01agm pll based clock driver, 53115 series, 30 true outputs, 0 inverted outputs, lead free, mo220, qfn64, view the manufacturer, and stock, and datasheet pdf for the si53115a01agm at jotrin electronics. This flag might be used to configure the pll input clock more accurately when using the wdt oscillator or a more dyanmic clkin source. On semiconductors new pureedge highperformance, pll. With output frequencies of up to 240 mhz and a maximum output skew of 150 ps, the mpc93r51 is an ideal. There is a need to isolate this noise component and prevent it from spreading into the pcb board. It steps up the clock frequency of a crystal clock to that of the data rate. Idt74fct88915tt3py datasheet111 pages idt low skew pll. Replica tx clock driver channel forward clock amplifier. Dealing with pll clock jitter in advanced processor designs.
A pll based timing module that generates timing signals by multiplying an external reference a zerodelay buffer used on a memory module to buffer the clock signal pll resolution the resolution of a pll is based on the number of bits in the m and n counter. A phase locked loop or phase lock loop pll is a control system that generates an output signal whose phase is related to the phase of an input signal. A dualoutput integrated llc resonant controller and led. Pll based clock generators, with the ability to generate. March 26, 2004 lck4972 lowvoltage pll clock driver agere systems inc. With output frequencies of up to 200 mhz and a maximum output skew of 150ps, the. Low skew pll based cmos clock driver with 3state, idt74fct88915tt3py datasheet, idt74fct88915tt3py circuit, idt74fct88915tt3py data sheet. The lck4972 has output frequencies of up to 240 mhz and skews of less. M202021 vcso based clock pll preliminary, 23dec2003 w w w. A pll based deskewed clock generator which may be fully integrated on a microprocessor is disclosed.
Dealing with pll clock jitter in advanced processor. Pll clock driver mpc9600 mpc9600 revision 6 march 15, 2016 1 2016 integrated device technology, inc. The pulsebased digitally controlled oscillatr pbdco performs a high resolution and wide range. Lck4972 lowvoltage pll clock driver 1 features fully integrated pll output frequency up to 240 mhz 150 ps typical cycletocycle jitter. Motorola mc88915fn55 pll based clock driver pqcc28. The idt5v9351 uses a differential pecl reference input and an external feedback input. Phase locked loop pll based clock and data recovery circuit cdr using calibrated delay flip flop dff a thesis. Cy7b9973v roboclock, highspeed multioutput pll clock buffer.
A pll clock generator with 5 to 10 mhz of lock range for. Note that this is not just a simple aberration of the edge of the jittered clock from the nearest edge of the. The pll allows the processor to operate at a high internal clock frequency derived from a lowfrequency clock input, a feature that offers two immediate benefits. The oscillator generates a periodic signal, and the phase detector compares. Pll based drc the system reference clock is not used when. Stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. Abstracta microprocessor clock generator based upon an analog phase locked loop pll is described for deskewing the internal logic control clock to an external system clock. Pdf phaselocked loop pllbased frequency synthesizer for. Pll based clock driver, 2308 series,8trueoutputs, 0 inverted outputs, cmos, pdso16. The faculty of the department of electrical engineering. Preliminary information m202021 vcso based clock pll, 8525400 integrated circuit systems, inc.
Cy2304sxc2, pll based clock driver, 2304 series, 4 true outputs, 0 inverted outputs, cmos, pdso8, soic8. The ad9528 is a twostage pll with an integrated jesd204b sysref generator for multiple device synchronization the first stage pll pll1 provides input reference conditioning by reducing the jitter present on a system clock. Design of pllbased clock generation circuits 1987 by d jeong, g borriello, d hodges, r katz. Cy2304sxc2, pll based clock driver, 2304 series, 4 true. Ti warrants performance of its semiconductor products and related software to the specifications applicable at the time of sale in accordance with tis standard. The data clock is generated by using a phase locked loop pll as a frequency synthesizer. The devices employ a fully differential pll design to minimize cycletocycle and phase jitter. Designing with multipll and spreadspectrum clocks in. On semiconductors new pureedge highperformance, pllbased, clock generation devices deliver 50 percent better phase jitter than competitive products bestinclass devices create subps jitter quality clocks that improve timing accuracy, increase design flexibility and lower cost for highperformance telecom, networking and consumer. The idt5v9351 is a high performance, zero delay, low skew, phase lock loop pll clock driver. The purpose of this article is to make such issues less complex and to remove this uncertainty by examining the jitter issues of the clock from which pllbased processors derive timing as well as analyze the given clocks jitter with respect to an ideal clock, to the degree that the processors tolerance requires. This document details the design aspects of digital plls used in.
Pck953 20 mhz to 125 mhz pecl input, 9 cmos output, 3. A design procedure is developed in the context of time domain measures of oscillator jitter in a phase locked loop pll. A phaselocked loop or phase lock loop pll is a control system that generates an output signal whose phase is related to the phase of an input signal. Chapter 6 pll and clock generator university of colorado. The data integrity that the serdes o ers is predominantly due to the clock and data. Highbandwidth serial links recover timing based on the transitions of the data signals. Pllbased clock driver for highperformance risc or cisc processorbased systems. The pllbased ookaskfsk transmitter ic is offered by princeton technology corp. Pll based clock driver, 2305 series,8trueoutputs, 0 inverted outputs, cmos, pdso8. Xilinx xapp868 clock data recovery design techniques for.