{"id":477643,"date":"2025-04-14T19:39:23","date_gmt":"2025-04-14T17:39:23","guid":{"rendered":"https:\/\/www.eenewseurope.com\/?p=477643"},"modified":"2025-04-15T12:24:38","modified_gmt":"2025-04-15T10:24:38","slug":"convertisseur-analogique-numerique-multivoies-a-faible-bruit-et-haute-precision","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/convertisseur-analogique-numerique-multivoies-a-faible-bruit-et-haute-precision\/","title":{"rendered":"Convertisseur analogique-num\u00e9rique multivoies \u00e0 faible bruit et haute pr\u00e9cision"},"content":{"rendered":"<h3><span style=\"font-size: 16px;\">Le convertisseur analogique-num\u00e9rique sigma-delta AD4195-4 pr\u00e9sent\u00e9 par Analog Devices (ADI) est un composant multivoies 24\u2009bits\/62,5\u2009k\u00e9ch\/s. Ce circuit frontal analogique (AFE) est enti\u00e8rement int\u00e9gr\u00e9 et \u00e0 faible bruit, con\u00e7u pour les applications de mesure haute pr\u00e9cision.<\/span><\/h3>\n<p><strong>Adapt\u00e9 \u00e0 de nombreuses applications<\/strong><\/p>\n<p><span style=\"font-size: 16px;\">Le convertisseur AD4195-4<\/span>Il contient une r\u00e9f\u00e9rence interne et accepte deux r\u00e9f\u00e9rences diff\u00e9rentielles externes pouvant \u00eatre mises en tampon en interne. Il r\u00e9pond aux besoins\u00a0 d&rsquo;applications, comme le contr\u00f4le de processus industriels, la mesure de la temp\u00e9rature et de la pression, l\u2019instrumentation m\u00e9dicale et scientifique, la chromatographie, la surveillance de l\u2019environnement, les tests et mesures \u00e9lectriques. .\u00a0<\/p>\n<p><strong>Caract\u00e9ristiques importantes<\/strong><strong>:<\/strong><\/p>\n<ul>\n<li><strong>Amplificateur \u00e0 gain programmable (PGA)<\/strong>\u2009: compris entre 0,5 et 128, l&rsquo;amplificateur assure\u00a0 l&rsquo;interface directe avec des transducteurs de sortie \u00e0 faible amplitude (ponts r\u00e9sistifs, thermocouples et capteurs de temp\u00e9rature \u00e0 r\u00e9sistance (RTD), par exemple).<\/li>\n<li><strong>Gain programmable<\/strong> avec\u00a0 une large plage d\u2019entr\u00e9e de mode commun, pour des modes communs d\u2019entr\u00e9e affichant une grande variabilit\u00e9.<\/li>\n<li><strong>Sources de courant de pr\u00e9cision concordantes \u00e0 faible d\u00e9rive<\/strong>. L\u2019utilisation de sources de courant d\u2019excitation permet de commander des capteurs de temp\u00e9rature \u00e0 r\u00e9sistance \u00e0 2, 3 et 4 fils, ou des capteurs \u00e0 pont. Courants d\u2019excitation en sortie\u2009: 10\u2009\u03bcA, 50\u2009\u03bcA, 100\u2009\u03bcA, 250\u2009\u03bcA, 500\u2009\u03bcA, 1\u2009mA et 1,5\u2009 et autres sur demande, si n\u00e9cessaire.<\/li>\n<li><strong>Utiliser le commutateur d\u2019alimentation c\u00f4t\u00e9 bas (\u00ab\u00a0low-side\u00a0\u00bb) <\/strong>pour d\u00e9sactiver les capteurs \u00e0 pont entre les conversions.<\/li>\n<li><strong>Polarisation de tension pour les thermocouples<\/strong>: la source de tension V<sub>BIAS<\/sub> fixe la tension de mode commun d\u2019une voie \u00e0 la valeur (AVDD + AVSS)\/2.\u00a0 \u00a0<\/li>\n<li><strong>Multiples options de filtrage<\/strong> L\u2019AD4195-4 assurent \u00e0 l\u2019utilisateur le plus haut niveau de flexibilit\u00e9.<\/li>\n<\/ul>\n<p>Le s\u00e9quenceur intelligent permet de convertir chaque voie pr\u00e9configur\u00e9e et activ\u00e9e dans un ordre pr\u00e9d\u00e9termin\u00e9, et ainsi d\u2019intercaler une combinaison\u00a0 de transducteurs, v\u00e9rifications syst\u00e8me et mesures de diagnostic. Le s\u00e9quenceur \u00e9vite de communiquer de fa\u00e7on r\u00e9p\u00e9t\u00e9e entre l\u2019interface s\u00e9rie et le composant pour modifier la configuration.<\/p>\n<p>Les 16 voies doivent \u00eatre configur\u00e9es dans l\u2019ordre. Chacune de ces voies s\u00e9lectionne l\u2019une des huit configurations du convertisseur d\u00e9finies par l\u2019utilisateur en fonction du gain, du type de filtre, du d\u00e9bit de donn\u00e9es de sortie, de la mise en m\u00e9moire tampon et de la source de r\u00e9f\u00e9rence.<\/p>\n<p><a href=\"https:\/\/www.analog.com\/en\/index.html\">Analogu Devices (ADI)<\/a>\u00a0 &#8211;\u00a0<a href=\"https:\/\/www.analog.com\/en\/products\/ad4195-4.html\"><span style=\"font-size: 16px;\">sigma-delta AD4195-4<\/span><\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le convertisseur analogique-num\u00e9rique sigma-delta AD4195-4 pr\u00e9sent\u00e9 par Analog Devices (ADI) est un composant multivoies 24\u2009bits\/62,5\u2009k\u00e9ch\/s. Ce circuit frontal analogique (AFE) est enti\u00e8rement int\u00e9gr\u00e9 et \u00e0 faible bruit, con\u00e7u pour les applications de mesure haute pr\u00e9cision. Adapt\u00e9 \u00e0 de nombreuses applications Le convertisseur AD4195-4Il contient une r\u00e9f\u00e9rence interne et accepte deux r\u00e9f\u00e9rences diff\u00e9rentielles externes pouvant \u00eatre [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":477645,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[881],"tags":[9503,8848,9502],"domains":[47],"ppma_author":[1143],"class_list":["post-477643","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nouveaux-produits","tag-adi-fr","tag-convertisseur","tag-sigma_delta","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Convertisseur analogique-num\u00e9rique multivoies \u00e0 faible bruit ...<\/title>\n<meta name=\"description\" content=\"convertisseur analogique-num\u00e9rique sigma-delta AD4195-4 pr\u00e9sent\u00e9 par Analog Devices (ADI) est un composant multivoies 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