Project Analog - September 2008 - (Page 11) mcP41XX/42XX DiGi PoTS Using a Digital Potentiometer to Optimize a Photo Detection Circuit An excerpt from Application Note AN692 “Using a Digital Potentiometer to Optimize a Precision Single-Supply Photo Detection Circuit” Contributed by Microchip Technology www.microchip.com / View complete article here Contents Viewpoint Selecting the Proper Amplifier Using a Digital Potentiometer to Optimize a Photo Detection Circuit Resistor Networks in Critical Applications The MCP41XX/42XX are volatile/nonvolatile, 7/8-bit digital potentiometers with an SPI interface. These devices offer a variety of configurations simplifying design while minimizing cost, package size and pin count. They offer WiperLock™ Technology, which allows the user unlimited reprogramming and locking of the wiper setting. This is useful for equipment that requires factory trimming or recalibration. The MCP41/42XX families of devices are available with resistor values of 5 KΩ, 10 KΩ, 50k and 100 KΩ. Click here for more information on the MCP41XX/MC42XX family. IntroductIon Photodiodes bridge the gap between light and electronics. Many times, precision applications (such as CT scanners, blood analyzers, smoke detectors, position sensors, IR pyrometers and chromatographs) utilize the basic transimpedance amplifier circuit that transforms light energy into a usable electrical voltage. In these circuits, photodiodes are used to capture the light energy and transform it into a small current. This current is proportional to the level of illumination from the light source. A preamplifier then converts the current (in amperes) from the photodiode sensor into a usable voltage level. Analog news Microchip analog page Sample center microchipDIRECT Reference designs/ app notes Technical training 11 · PROjeCt ANAlOG · VOlUme 2 / NUmbeR 6 http://www.microchip.com http://ww1.microchip.com/downloads/en/AppNotes/00692b.pdf http://www.microchip.com http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=79&redirects=analog http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=79&redirects=analog http://sample.microchip.com/Default.aspx?testCookies=true http://www.microchipdirect.com/catalogselection.aspx?returnURL=default.aspx http://www.microchip.com/ParamChartSearch/chart.aspx?branchID=11026&mid=11&lang=en&pageId=79 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=1469&filter1=function&redirects=appnotes 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 Project Analog - September 2008 - Project Analog - September 2008 (Page Cover1) Project Analog - September 2008 - Contents (Page 2) Project Analog - September 2008 - Viewpoint (Page 3) Project Analog - September 2008 - About Project Analog Sponsor (Page 4) Project Analog - September 2008 - Selecting the Proper Amplifier for Strain Gauge Applications (Page 5) Project Analog - September 2008 - Selecting the Proper Amplifier for Strain Gauge Applications (Page 6) Project Analog - September 2008 - Selecting the Proper Amplifier for Strain Gauge Applications (Page 7) Project Analog - September 2008 - Selecting the Proper Amplifier for Strain Gauge Applications (Page 8) Project Analog - September 2008 - An Overview of Analog Sensor Conditioning Circuits (Page 9) Project Analog - September 2008 - An Overview of Analog Sensor Conditioning Circuits (Page 10) Project Analog - September 2008 - Using a Digital Potentiometer to Optimize a Photo Detection Circuit (Page 11) Project Analog - September 2008 - Using a Digital Potentiometer to Optimize a Photo Detection Circuit (Page 12) Project Analog - September 2008 - Resistor Networks in Critical Applications (Page 13) Project Analog - September 2008 - Resistor Networks in Critical Applications (Page 14) Project Analog - September 2008 - Selecting the Right Op Amp (Page 15) Project Analog - September 2008 - Selecting the Right Op Amp (Page 16) Project Analog - September 2008 - Selecting the Right Op Amp (Page 17) Project Analog - September 2008 - Analog News (Page 18) Project Analog - September 2008 - Contact Microchip (Page 19) Project Analog - September 2008 - New Microchip Products (Page 20) Project Analog - September 2008 - Treelink (Page 21) Project Analog - September 2008 - MINDI™ Active Filter Designer (Page 22) Project Analog - September 2008 - Microchip Advanced Parts Selector (MAPS) (Page 23) Project Analog - September 2008 - Microchip Advanced Parts Selector (MAPS) (Page Cover4)
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