Dear Sir/Madam

Even in digital circuits the designer has to consider analogue effects like circulating currents or RF problems if the circuits are working in the GHz range. In this newsletter you´ll find some products, articles and design tips to create proper analogue Devices. Enjoy!

Wolfgang Patelay
Technical Editor, EPN

At Glance, in this issue

1. Products News 2. Articles 3. Design Tips 4. Book of the Month

1| Product News

Linear Position Sensor/Encoder (IC Haus)
The iC-ML is an integrated magnetic linear position sensor/encoder assembled in a space-saving TSSOP20 package measuring only 6.6x6.4x1.1mm. The circuit contains four Hall sensors for the generation of analogue sine/cosine signals at a pole pitch of 2.56mm; it also has an integrated signal-conditioning unit with an ADC and output interfaces.
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Data And Power Isolation (Analog Devices)
Part of the iCoupler family, the ADuM524x devices are the industry's first to provide both data and power isolation in a single package. Unlike existing solutions that require the configuration of separate signal and power circuitry involving multiple components, these devices integrate a DC/DC converter providing up to 50mW of isolated, regulated power at 5V, with independent signal channels.
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RS485 Transceivers (Linear Technology)
The LTC2856, LTC2857 and LTC2858 are low power RS485/422 transceivers, operating on 5V supplies. Each IC is available in two versions, one that operates at maximum data rates of 20Mbytes/s, while another delivers 250kbit/s slew rate limited driver outputs to control high frequency emission from equipment and data cables. Enhanced ESD protection on the transceiver interface pins allows the ICs to withstand ±15kV for ESD strikes without latchup or damage.
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LVDS Dual Multiplexer Buffers (National Semiconductor)
The DS15MB200, SCAN15MB200 and DS08MB200 aim to extend the reach of LVDS signals across cables and backplanes in point-to-point applications. The dual multiplexer-buffer configuration manages redundant differential data streams at speeds up to 1.5Gbps.
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2| Articles

Intelligent Power-Management Trends and Methods
Over the past years, great steps ahead have been made in process technology to enhance the performance of power converters; novel topologies and innovative IC control logics that have renovated the standard power-supply architectures. Nevertheless, all of these technology improvements are useless without a careful and scrupulous analysis by the designer before putting these novel advances into practical use. Michele Sclocchi explains in his article the different methods a designer can use for analysing novel topologies.
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Circulating currents: The warnings are out
Technical Editor Paul Rako gives in his cover story in EDN an understanding how to avoid or minimize the effects of circulating currents and make your designs more robust. Every engineer should know the techniques for neutralizing this insidious phenomenon.
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3| Design Tips

Gain-of-three amplifier requires no external resistors
Analog Devices' ADA4862-3 comprises three wideband amplifiers, each configured by an internal, fixed-value resistive-feedback network as a noninverting gain-of-two amplifier. M. Stofk from the Slovak University of Technology in Bratislava shows in his Design Idea how this IC provides wideband amplification and minimizes parts count.
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High-impedance buffer amplifier's input includes ESD protection
Certain measurement applications, such as for pH (acidity) and bio-potentials, require a high-impedance buffer amplifier. Although several semiconductor manufacturers offer amplifier ICs featuring low bias and offset-input currents, attaching a sensor cable to an amplifier circuit can inflict damage from ESD (electrostatic discharge). Eugene Palatnik describes in his Design Idea that diodes and guard traces can suppress high-voltage static-discharge transients.
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4| Book of The Month

Introduction to Linear Circuit Analysis and Modelling, by Luis Moura and Izzat Darwazeh,
The authors introduce linear circuit modelling and analysis applied to both electrical and electronic circuits, starting with DC and progressing up to RF, considering noise analysis along the way. The book is also supported by a companion website, featuring a full solutions manual, additional equations, graphs and illustrations for Lecturers to download when preparing teaching aids, as well as numerous case studies, worked examples and exercises using Matlab to aid student learning.
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