\nLook up the following in the device datasheet:\n<\/p>\n
\nTad = ADC Clock period ADC Clock Period\n<\/p>\n
\nSample Time\n<\/p>\n
\nConversion Time (value not needed to setup but this tells you how long it will take to convert)\n<\/p>\n
\nADCS – ADC Conversion Clock Select bits\n<\/p>\n
\nADC_CONV_CLK_#Tcy \n<\/p>\n
\nThis value sets Tad:\n<\/p>\n
\nTpb (Peripheral bus speed) x Value Used = Tad\n<\/p>\n
\nSAMC – Auto-Sample Time bits\n<\/p>\n
\nADC_SAMPLE_TIME_# (A\/D Auto Sample Time x Tad)\n<\/p>\n
\nThis value sets the sample time\n<\/p>\n
\nTad = ADC Clock period ADC Clock Period = 65nS min\n<\/p>\n
\nConversion Time = 12Tad typ\n<\/p>\n
\nSample Time = 1Tad min\n<\/p>\n
\nWith a 40MHz osc and 40MHz peripheral bus these values would provide the required times:\n<\/p>\n
\nADC_CONV_CLK_3 provides Tad = 75nS\n<\/p>\n
\nADC_SAMPLE_TIME_3 provides 3Tad so more than the 1Tad minimum but enuring our input impedance etc doesn't affect the sampling capacitor being fully charged each time.\n<\/p>\n
\n \n<\/p>\n
\n <\/p>\n","protected":false},"excerpt":{"rendered":"
Setting up the AtoD Sampling Look up the following in the device datasheet: Tad = ADC Clock period ADC Clock Period Sample Time Conversion Time (value not needed to setup but this tells you how long it will take to convert) ADCS – ADC Conversion Clock Select bits ADC_CONV_CLK_#Tcy This value sets Tad: Tpb (Peripheral bus speed) […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61],"tags":[],"class_list":["post-853","post","type-post","status-publish","format-standard","hentry","category-atod-xc32"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/embedded\/wp-json\/wp\/v2\/posts\/853","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/embedded\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/embedded\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/embedded\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/embedded\/wp-json\/wp\/v2\/comments?post=853"}],"version-history":[{"count":3,"href":"https:\/\/ibex.tech\/embedded\/wp-json\/wp\/v2\/posts\/853\/revisions"}],"predecessor-version":[{"id":856,"href":"https:\/\/ibex.tech\/embedded\/wp-json\/wp\/v2\/posts\/853\/revisions\/856"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/embedded\/wp-json\/wp\/v2\/media?parent=853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/embedded\/wp-json\/wp\/v2\/categories?post=853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/embedded\/wp-json\/wp\/v2\/tags?post=853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}