Project Analog - November 2008 - (Page 12)

mcP9700Dm-PcTl fiG 1 iN ThiS PrEciSioN PhoToSENSiNG coNfiGuraTioN, a PhoToDioDE iS uSED To caPTurE ThE lumiNaNcE ENErGy from a liGhT SourcE. ThE EffEcTS of ThE variaBiliTy DuE To aliGNmENT ProBlEmS, iS rEDucED By uSiNG a PoTENTiomETEr fro ThE rESiSTivE ElEmENT iN ThE fEEDBack looP of ThE amPlifiEr. mIcrochIp RESOURCES Contents Digital Potentiometer Design Guide: http://ww1. microchip.com/downloads/en/ DeviceDoc/22017a.pdf AN1080, “Understanding Digital Potentiometer Resistor Variations”: http://ww1. microchip.com/downloads/en/ AppNotes/01080a.pdf AN691, “Optimizing the Digital Potentiometer in Precision Circuits”: http://ww1. microchip.com/downloads/en/ AppNotes/00691a.pdf AN219, “Comparing Digital Potentiometers to Mechanical Potentiometers”: http://ww1. microchip.com/downloads/en/ AppNotes/00219.pdf Signal Chain Design Guide: http:// ww1.microchip.com/downloads/ en/AppNotes/21825c.pdf Viewpoint Selecting the Proper Amplifier Using a Digital Potentiometer to Optimize a Photo Detection Circuit Resistor Networks in Critical Applications Analog news The MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board demonstrates how to interface the MCP9700 to a PICmicro® microcontroller using the PICkit™ 1 Flash Starter Kit as a platform. The MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board can also be used as a “stand-alone” module to quickly add thermal sensing capablity to any existing application. This basic sensor functionality is implemented on a small Printed Circuit Board (PCB) and an interface via a standard 100-mil header. This can be used by the system designer as an example of how to integrate an analog temperature sensor into systems. click here for more information. This article will show how the adjustability of the digital potentiometer can be used as an advantage in photosensing circuits. Initially, photodiode characteristics will be looked at, followed by various digital potentiometer circuits that use photodiodes in the Photoconductive and Photovoltaic modes. For more information, refer to the complete application note here. Microchip analog page Sample center microchipDIRECT Reference designs/ app notes Technical training 12 · PROjeCt ANAlOG · VOlUme 2 / NUmbeR 6 http://ww1.microchip.com/downloads/en/DeviceDoc/22017a.pdf http://ww1.microchip.com/downloads/en/DeviceDoc/22017a.pdf http://ww1.microchip.com/downloads/en/DeviceDoc/22017a.pdf http://ww1.microchip.com/downloads/en/AppNotes/01080a.pdf http://ww1.microchip.com/downloads/en/AppNotes/01080a.pdf http://ww1.microchip.com/downloads/en/AppNotes/01080a.pdf http://ww1.microchip.com/downloads/en/AppNotes/00691a.pdf http://ww1.microchip.com/downloads/en/AppNotes/00691a.pdf http://ww1.microchip.com/downloads/en/AppNotes/00691a.pdf http://www.microchip.com http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=79&redirects=analog http://ww1.microchip.com/downloads/en/AppNotes/00219.pdf http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=79&redirects=analog http://ww1.microchip.com/downloads/en/AppNotes/00219.pdf http://sample.microchip.com/Default.aspx?testCookies=true http://ww1.microchip.com/downloads/en/AppNotes/00219.pdf http://www.microchipdirect.com/catalogselection.aspx?returnURL=default.aspx http://ww1.microchip.com/downloads/en/AppNotes/21825c.pdf http://ww1.microchip.com/downloads/en/AppNotes/21825c.pdf http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://ww1.microchip.com/downloads/en/AppNotes/00692b.pdf http://ww1.microchip.com/downloads/en/AppNotes/21825c.pdf http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1469&filter1=function&redirects=appnotes http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en023169 http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1423

Table of Contents Feed for the Digital Edition of Project Analog - September 2008

Project Analog - September 2008 Contents Viewpoint About Project Analog Sponsor Selecting the Proper Amplifier for Strain Gauge Applications An Overview of Analog Sensor Conditioning Circuits Using a Digital Potentiometer to Optimize a Photo Detection Circuit Resistor Networks in Critical Applications Selecting the Right Op Amp Analog News Contact Microchip New Microchip Products Treelink MINDI™ Active Filter Designer Microchip Advanced Parts Selector (MAPS)

Project Analog - September 2008

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