Project Analog - November 2008 - (Page 13) Resistor Networks in Critical Applications For stability in medical and aerospace electronics, thin-film is in By Mike Torres / BI Technologies, Fullerton, CA http://www.bitechnologies.com Contents Viewpoint Selecting the Proper Amplifier Using a Digital Potentiometer to Optimize a Photo Detection Circuit Resistor Networks in Critical Applications Analog news F rom instrument amplifiers to precision analog circuits to geophones, resistor networks are used in a variety of applications. Each has its own unique requirements, but none more stringent than the high-reliability applications found in medical and aerospace industries. In ultrasound equipment, for example, circuits require tight resistor tolerances and excellent tracking. Plane flight controllers or calculators demand precision resistors, while also requiring that components meet tight size constraints. Long-life stability is important for resistor networks in these applications. Precision thin-film networks are available on ceramic and silicon-based substrates. Resistor networks are best realized with thin-film resistor technology, which offers the flexibility to implement either standard or custom resistor circuits. For applications requiring high accuracy, ceramic materials are used for substrate material. Resistor networks usually contain from two to 20 resistors. Many circuit designers prefer to use more networks of fewer resistors each to simplify their board routing. Putting the resistors directly adjacent to the amplifiers simplifies board routing and shortens critical trace lengths. This approach can now be accommodated by the availability of resistor pairs (dividers) in SOT23 packages, or four resistors (differential amplifiers) in SOIC 8-pin packages. Microchip analog page Sample center microchipDIRECT Reference designs/ app notes Technical training 13 · PROjeCt ANAlOG · VOlUme 2 / NUmbeR 6 http://www.bitechnologies.com 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/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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