There are also several ways to produce a dithered clock. The resulting formula is verified by data generated by the Maxim CLK Generation chip MAX9492.
CY25562 is a spread spectrum clock generator SSCG IC used to reduce electromagnetic interference EMI found in todays high speed digital electronic systems.
Clock generator spread spectrum. Spectral peaks can be attenuated by slightly modulating the oscillation. The CY258111214 products are Spread Spectrum Clock Generator SSCG ICs used for the purpose of reducing electromagnetic interference EMI found in todays high-speed digital electronic systems.
Mm2W x L PKG CDCE6214 – NEW – Ultra-low power clock generator with one PLL four differential output. This article describes how the spread-spectrum CLK is defined and provides a simple formula for estimating. Clock verstanden das elektromagnetische Strungen minimiert.
Diese Seite wurde zuletzt am 29. Spread Spectrum Clock Generation SSCG a Definition Spread Spectrum Clock Generation is a method by which the energy contained in the narrow band of a clock source is spread over a wider band in a controlled manner thus reducing the peak spectral amplitude of the fundamental and the harmonics to lower the radiated emission from the clock source. The Cypress CY25560 is a spread spectrum clock generator SSCG IC used to reduce the EMI found in todays high-speed digital electronic systems.
Clock Generation with Spread Spectrum May 20 2005 Abstract. A design layout and simulation of a spread-spectrum clock generator SSCG is presented. Unter Spread Spectrum Clocking abgekrzt SSC wird in der synchronen Digitaltechnik ein spezielles Taktsignal engl.
The devices use a Cypress proprietary phase-locked loop PLL and Spread Spectrum Clock SSC technology to synthesize and. Reducing electromagnetic interference EMI has become an important design issue for electronic system designers. CY25562 uses a Cypress proprietary phase locked loop PLL and spread spectrum clock SSC technology to synthesize and frequency modulate the input frequency of the reference clock.
AN4850 Spread-spectrum clock generation 15 1 Spread-spectrum clock generation The conventional clock generator provides a very stable clock frequency while the SSCG spread-spectrum clock generation provides more jitters compared to the conventional clock generator. Spread Spectrum Clocking The idea behind using a spread spectrum technique to reduce EMI is to keep the clock moving. Dabei wird das Taktsignal in einem bestimmten Frequenzbereich laufend variiert es wird dabei knstlich mit einem so genannten Jitter versehen.
A steady clock is an easy target for neighboring devices and conformity test equipment to lock onto allowing them time to accumulate emanating signal energy at the fixed clock frequency or its harmonics. Spread Spectrum Clock Generator Description PCS3P2189A is a versatile spread spectrum frequency modulator that generates a low EMI 4x clock at the output. Core supply voltage V Output frequency Max MHz Output supply voltage V Operating temperature range C Package size.
19032013 Spread spectrum clock generation SSCG or dithering modulating the clock frequency has been around for a long while even before the PC and printer manufacturers got on the bandwagon. SPREAD SPECTRUM CLOCK GENERATOR ICS7152 IDT. SPREAD SPECTRUM CLOCK GENERATOR 1 ICS7152 REV K 062911 Description The ICS7152-01 -02 -11 and -12 are clock generators for EMI Electro Magnetic Interference reduction see below for frequency ranges and multiplier ratios.
Having a SSCG results in lower peak-energy on the central frequency. Multiple-Output Clock Generator with Spread Spectrum 2 _____ ABSOLUTE MAXIMUM RATINGS DC ELECTRICAL CHARACTERISTICS VDD VDDA 30V to 36V TA -40C to 85C unless otherwise noted. The spurious-free dynamic range of RF DACs are limited by the heavy digital do- main switching which interferes with the analog output signal.
Spread spectrum clocking is a technique where the clock frequency is modulated slightly to lower the peak energy generated by a clock. Typical values at VDD VDDA 33V TA 25C. Spread-Spectrum Crystal Oscillator SSXO SSXO uses proprietary PLL and Spread-Spectrum Clock Generator SSCG technology to synthesize from and modulate the frequency of the input crystal.
The MAX31C80MAX31D80 are spread-spectrum clock generators that contain a phase-locked loop PLL that generates a 2MHz to 134MHz clock from an input clock or crystal. Measured radiated energy at the fundamental and harmonic frequencies are reduced to comply with Electro Magnetic Compliance EMC requirement. PCS3P2189A offers four selectable centre spread options of 05 10 15 20 Refer to Spread Deviation Selection Table.
Spread spectrum clocking lowers clock-generated EMI from both the fundamental frequency and subsequent harmonics thereby. This article describes how the spread-spectrum CLK is defined and provides a simple formula for estimating the EMI suppression. A spread-spectrum clock CLK is an efficient way to reduce EMI.
PCS3P2189A reduces electromagnetic interference EMI at the clock source. This is achieved by frequency modulating the clock. By frequency modulating the clock.
The CY25560 uses Cypresss proprietary phase-locked loop PLL and spread spectrum clock SSC technology to synthesize and frequency modulate the input frequency of the reference clock. The PLL can provide a spread-spectrum down-dithered MAX31D80 or center-dithered MAX31C80 frequency-modulated clock. A spread-spectrum clock CLK is an efficient way to reduce EMI.