{"id":216502,"date":"2016-04-01T06:00:00","date_gmt":"2016-04-01T06:00:00","guid":{"rendered":"https:\/\/eenewseurope.artwhere.co\/synthetiseur-et-distributeur-de-frequences-dhorloge-de-2-a-2700-mhz-a-tres-faible-gigue\/"},"modified":"2016-04-01T06:00:00","modified_gmt":"2016-04-01T06:00:00","slug":"synthetiseur-et-distributeur-de-frequences-dhorloge-de-2-a-2700-mhz-a-tres-faible-gigue","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/synthetiseur-et-distributeur-de-frequences-dhorloge-de-2-a-2700-mhz-a-tres-faible-gigue\/","title":{"rendered":"Synth\u00e9tiseur et distributeur de fr\u00e9quences d\u2019horloge, de 2 \u00e0 2700 MHz, \u00e0 tr\u00e8s faible gigue"},"content":{"rendered":"

Ce synth\u00e9tiseur poss\u00e8de quatre sorties de niveau logique en mode courant (CML), chacune \u00e9quip\u00e9e d\u2019un ensemble diviseur num\u00e9rique et retardateur d\u2019horloge ind\u00e9pendants, \u00e0 faible niveau de bruit, pour couvrir une large gamme de fr\u00e9quences, de 1,95 MHz \u00e0 2700 MHz. Avec un niveau de gigue absolu de 115 fs (eff.), il g\u00e9n\u00e8re les signaux d\u2019horloge essentiels, \u00e0 faible gigue, pour r\u00e9aliser la synchronisation des convertisseurs de donn\u00e9es, avec le meilleur rapport signal sur bruit SNR.<\/sub> aux fr\u00e9quences \u00e9lev\u00e9es en entr\u00e9e et forts d\u00e9bits de donn\u00e9es en sortie.<\/p>\n

Ce circuit pr\u00e9sente trois sch\u00e9mas innovants pour simplifier l\u2019extension de l\u2019horloge de sortie et la cr\u00e9ation d\u2019arbres de distribution d\u2019horloges plus larges utilis\u00e9s dans les syst\u00e8mes \u00e0 plusieurs cartes filles ou avec un nombre \u00e9lev\u00e9 de convertisseurs de donn\u00e9es. La m\u00e9thode de synchronisation de la sortie EZSync propri\u00e9taire garantit des relations de phase, reproductibles et d\u00e9terministes, entre les sorties du diviseur d\u2019horloge du synth\u00e9tiseur et les composants EZSync. La caract\u00e9ristique de synchronisation parall\u00e8le de plusieurs puces ParallelSync permet la resynchronisation des sorties de plusieurs circuits synth\u00e9tiseurs \u00e0 une horloge de r\u00e9f\u00e9rence commune. Ceci autorise un alignement de la synchronisation sur l\u2019horloge de r\u00e9f\u00e9rence avec un temps d\u2019\u00e9tablissement de l\u2019ordre de la nanoseconde, et d\u2019un maintien de la dur\u00e9e faciles \u00e0 atteindre.<\/p>\n

Le EZ204Sync JESD204B sous-classe 1, compatible avec la m\u00e9thode de synchronisation, est construit sur les deux approches pr\u00e9c\u00e9dentes et assure la g\u00e9n\u00e9ration des signaux SYSREF et DEVCLK essentiels au standard JEDEC lors de la mise en parall\u00e8le de plusieurs LTC695, ainsi qu\u2019avec tout autre composant d\u2019horloge compatible EZSync. <\/p>\n

Le processus de conception avec ce synth\u00e9tiseur est simplifi\u00e9 en utilisant l\u2019outil de simulation et de conception LTC6951Wizard, librement t\u00e9l\u00e9chargeable. Ce logiciel procure les param\u00e8tres de la boucle \u00e0 verrouillage de phase PLL appropri\u00e9s et les valeurs des composants du filtre de boucle en un click, et pr\u00e9dit pr\u00e9cis\u00e9ment les niveaux de bruit de phase et de gigue de chaque sortie. En plus de la simulation du fonctionnement, l\u2019interface graphique utilisateur (GUI) int\u00e9gr\u00e9e fournit un signal d\u2019oscilloscope qui simule des r\u00e9sultats dans le domaine temporel des sorties du synth\u00e9tiseur bas\u00e9s sur les param\u00e8tres du diviseur d\u2019horloge, de retard et de synchronisation, ce qui simplifie le processus de conception et offre une assistance pendant la phase de mise en \u0153uvre du circuit.<\/p>\n

Propos\u00e9 en bo\u00eetier plastique QFN 40 broches, de 5 x 7 mm,  ce circuit synth\u00e9tiseur est sp\u00e9cifi\u00e9 sur la gamme de temp\u00e9ratures de jonction de \u201140 \u00b0C \u00e0 +105 \u00b0C.<\/p>\n

www.linear.com\/product\/LTC6951<\/a><\/a><\/a><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Pr\u00e9sentant un faible niveau de bruit de phase, le synth\u00e9tiseur \u00e0 diviseur de fr\u00e9quence fractionnaire N LTC6951 de Linear Technology int\u00e8gre un VCO et une section pour la distribution des horloges, \u00e0 tr\u00e8s faible niveau de gigue. Il permet la synchronisation de plusieurs puces et le cadencement JESD204B.<\/p>\n","protected":false},"author":9,"featured_media":216503,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[881],"tags":[896],"domains":[47],"ppma_author":[1141],"class_list":["post-216502","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nouveaux-produits","tag-digitalsignalprocessing-fr","domains-electronique-eci"],"acf":[],"yoast_head":"Synth\u00e9tiseur et distributeur de fr\u00e9quences d\u2019horloge, de 2 ...<\/title>\n<meta name=\"description\" content=\"Pr\u00e9sentant un faible niveau de bruit de phase, le synth\u00e9tiseur \u00e0 diviseur de fr\u00e9quence fractionnaire N LTC6951 de Linear Technology int\u00e8gre un VCO et...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ecinews.fr\/fr\/wp-json\/wp\/v2\/posts\/216502\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Synth\u00e9tiseur et distributeur de fr\u00e9quences d\u2019horloge, de 2 \u00e0 2700 MHz, \u00e0 tr\u00e8s faible gigue\" \/>\n<meta property=\"og:description\" content=\"Pr\u00e9sentant un faible niveau de bruit de phase, le synth\u00e9tiseur \u00e0 diviseur de fr\u00e9quence fractionnaire N LTC6951 de Linear Technology int\u00e8gre un VCO et une section pour la distribution des horloges, \u00e0 tr\u00e8s faible niveau de gigue. 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