{"action":"created","issue":{"url":"https://api.github.com/repos/m-labs/sinara/issues/38","repository_url":"https://api.github.com/repos/m-labs/sinara","labels_url":"https://api.github.com/repos/m-labs/sinara/issues/38/labels{/name}","comments_url":"https://api.github.com/repos/m-labs/sinara/issues/38/comments","events_url":"https://api.github.com/repos/m-labs/sinara/issues/38/events","html_url":"https://github.com/m-labs/sinara/issues/38","id":185965002,"number":38,"title":"AD9656 input configuration","user":{"login":"dhslichter","id":9222487,"avatar_url":"https://avatars.githubusercontent.com/u/9222487?v=3","gravatar_id":"","url":"https://api.github.com/users/dhslichter","html_url":"https://github.com/dhslichter","followers_url":"https://api.github.com/users/dhslichter/followers","following_url":"https://api.github.com/users/dhslichter/following{/other_user}","gists_url":"https://api.github.com/users/dhslichter/gists{/gist_id}","starred_url":"https://api.github.com/users/dhslichter/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dhslichter/subscriptions","organizations_url":"https://api.github.com/users/dhslichter/orgs","repos_url":"https://api.github.com/users/dhslichter/repos","events_url":"https://api.github.com/users/dhslichter/events{/privacy}","received_events_url":"https://api.github.com/users/dhslichter/received_events","type":"User","site_admin":false},"labels":[{"id":470809992,"url":"https://api.github.com/repos/m-labs/sinara/labels/area:sayma-RTM","name":"area:sayma-RTM","color":"5319e7","default":false}],"state":"open","locked":false,"assignee":{"login":"gkasprow","id":4325054,"avatar_url":"https://avatars.githubusercontent.com/u/4325054?v=3","gravatar_id":"","url":"https://api.github.com/users/gkasprow","html_url":"https://github.com/gkasprow","followers_url":"https://api.github.com/users/gkasprow/followers","following_url":"https://api.github.com/users/gkasprow/following{/other_user}","gists_url":"https://api.github.com/users/gkasprow/gists{/gist_id}","starred_url":"https://api.github.com/users/gkasprow/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gkasprow/subscriptions","organizations_url":"https://api.github.com/users/gkasprow/orgs","repos_url":"https://api.github.com/users/gkasprow/repos","events_url":"https://api.github.com/users/gkasprow/events{/privacy}","received_events_url":"https://api.github.com/users/gkasprow/received_events","type":"User","site_admin":false},"assignees":[{"login":"gkasprow","id":4325054,"avatar_url":"https://avatars.githubusercontent.com/u/4325054?v=3","gravatar_id":"","url":"https://api.github.com/users/gkasprow","html_url":"https://github.com/gkasprow","followers_url":"https://api.github.com/users/gkasprow/followers","following_url":"https://api.github.com/users/gkasprow/following{/other_user}","gists_url":"https://api.github.com/users/gkasprow/gists{/gist_id}","starred_url":"https://api.github.com/users/gkasprow/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gkasprow/subscriptions","organizations_url":"https://api.github.com/users/gkasprow/orgs","repos_url":"https://api.github.com/users/gkasprow/repos","events_url":"https://api.github.com/users/gkasprow/events{/privacy}","received_events_url":"https://api.github.com/users/gkasprow/received_events","type":"User","site_admin":false}],"milestone":null,"comments":5,"created_at":"2016-10-28T16:24:53Z","updated_at":"2016-10-28T20:09:53Z","closed_at":null,"body":"1. Use Schottky diodes for input protection on AD9656.  For each input, want diodes both to ground and +1.8V supply rail.  Diodes should be placed immediately next to AD9656, between AD9656 and filter/impedance matching component footprints.  Suggest [HSMS-286C-TR1G](http://www.digikey.com/product-detail/en/broadcom-limited/HSMS-286C-TR1G/516-1822-1-ND/1966528), which has low forward voltage and tolerates up to 4V reverse bias.  Series connected diodes, series anode to ground, cathode to +1.8 V rail.\r\n\r\n2. Include 0603 pads for impedance matching/band defining components TBD.  Input impedace information for AD9656 available [here](http://www.analog.com/en/products/analog-to-digital-converters/ad-converters/ad9656.html#product-tools) in Excel spreadsheet form to enable component choices.  See also [AN-742](http://www.analog.com/media/en/technical-documentation/application-notes/587173998057911564087081655730496713845335290374441083AN_742_a.pdf?doc=AD9656.pdf) and [AN-827](http://www.analog.com/media/en/technical-documentation/application-notes/577685821057469457705578853404381574892535191189340957AN_827_0.pdf?doc=AD9656.pdf).  Connections should be differential only, no connections to ground or positive rail.  See drawing below.\r\n![image](https://cloud.githubusercontent.com/assets/9222487/19819205/d9044830-9d10-11e6-8705-3f831a8be493.png)\r\n"},"comment":{"url":"https://api.github.com/repos/m-labs/sinara/issues/comments/257016439","html_url":"https://github.com/m-labs/sinara/issues/38#issuecomment-257016439","issue_url":"https://api.github.com/repos/m-labs/sinara/issues/38","id":257016439,"user":{"login":"dhslichter","id":9222487,"avatar_url":"https://avatars.githubusercontent.com/u/9222487?v=3","gravatar_id":"","url":"https://api.github.com/users/dhslichter","html_url":"https://github.com/dhslichter","followers_url":"https://api.github.com/users/dhslichter/followers","following_url":"https://api.github.com/users/dhslichter/following{/other_user}","gists_url":"https://api.github.com/users/dhslichter/gists{/gist_id}","starred_url":"https://api.github.com/users/dhslichter/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dhslichter/subscriptions","organizations_url":"https://api.github.com/users/dhslichter/orgs","repos_url":"https://api.github.com/users/dhslichter/repos","events_url":"https://api.github.com/users/dhslichter/events{/privacy}","received_events_url":"https://api.github.com/users/dhslichter/received_events","type":"User","site_admin":false},"created_at":"2016-10-28T20:09:53Z","updated_at":"2016-10-28T20:09:53Z","body":"Further information on TVS vs Schottky for ADC input protection: http://www.analog.com/media/en/analog-dialogue/volume-49/number-2/articles/rf-samp-adc-input-protection.pdf"}}
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