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Digital Microphone Applications and System Partitioning by Arie van Rhijn, National Semiconductor
Almost every audio application will convert the input audio signal into a digital representation to further process the information. Since real-world audio signals are small analog signals, there are often two distinct functions at the input of these systems: (pre) amplification and A/D conversion. National Semiconductor has developed an integrated circuit (IC) that, by replacing the JFET in a conventional electret condenser microphone (ECM), will result in a fully digital output from an ECM. This easy-to-manufacture, four-wire ECM has only power, ground, clock, and data connections, completely eliminating the sensitive low-level analog signal present on a conventional ECM.

Logarithmic Signal Companding—Not Just a Good Idea, It's µ-Law! by David Van Ess, Cypress MicroSystems
This tech note presents a tutorial on logarithmic signal compression. Routines are developed and an application is shown to implement a µ-Law compressor that converts an analog voice-band signal and produces a digitized 8-bit compressed value. An expanding D/A converter is also developed that restores the compressed digital value back to an analog value.

Product Reviews

TI's New LDOs Provide Ultra-Low Noise, High Ripple Rejection for Noise-Sensitive Applications - (Product of the Week)
Toshiba Adds High-Speed Transmitter/Receiver for Automotive LAN to Its TOSLINK Family of Fiber-Optic Devices
National Semiconductor Improves Audio Quality in Consumer Products with New Microphone Technology
Motorola Introduces Flexible I/O Expansion IC for Microcontroller-Based Systems
Microchip Technology Advances Power Management with 500 mA Synchronous Buck DC/DC Converter
Analog Devices Announces 14-Bit, Low-Power A/D Converter in Chip-Scale Packaging
Power-Amp Modules from Agilent Extend Mobile-Phone Battery Life by 15%
Fujitsu Announces World's Fastest CMOS DAC

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Technical Features and Editorials

Columns

Class-D Amplifiers: Coming of Age by Nicholas Holland, Texas Instruments
Using RS-485 for Digital Motor Control Applications by Clark Kinnaird, Ph.D, Texas Instruments
Audio Amplifier Power Specification Tricks Revealed! by Dave Skinner, Texas Instruments
Advanced DVD Players With MPEG-4 ý Part III: The Software Perspective by Ken Lowe, VP Business Development and Corporate Communications, Sigma Designs, Inc.
Telecom Power Systems: Why Be Discrete? by Brian King and Robert Kollman, Texas Instruments
Precision Analog-to-Digital Converter Architecture Trade-Offs by Robert Schreiber
Advanced DVD Players With MPEG-4 Part II - The Hardware Perspective by Ken Lowe
Design of a Prescaler Using Agilent EEs of EDA's ADS and the RFIC Dynamic Link to Cadence by Andy Howard
Designing for Low Distortion with High-Speed Op Amps by James L. Karki
The Arrival of Advanced DVD Players with MPEG-4 by Ken Lowe
The Design of 100Mbps to 660Mbps BUS LVDS Serializer/Deserializer for 3G Base Stations by Lin Wu
Filter Design in Thirty Seconds by Bruce Carter

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Tech Notes.

Digital Microphone Applications and System Partitioning by Arie van Rhijn, National Semiconductor
Logarithmic Signal Companding—Not Just a Good Idea, It's µ-Law! by David Van Ess, Cypress MicroSystems
SMARTMOSý Power IC for Relay Replacement by Kevin Anderson, Motorola Semiconductor
Ultra-Thin Silicon-on-Sapphire Component Technology for Parallel Optical Interconnects
Transmitter and Receiver Architecture Issues for High-Performance OFDM WLAN Radios
Linearization Techniques for Power Amplifiers
Do's and Don'ts of Applying A/D Converters by Intersil Corp.
Germanium Doping Enhances Silicon Performance in Wireless Communications
Optical Mice and How They Work by Agilent Technologies
Secrets Revealed: Creating accurate LVDS IBIS models by Adam Tambone, Fairchild Semiconductor Corp.
SPI-5 Spec - A Tutorial

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Editorial.

E-Waste, Preparing for Battle by Paul O'Shea
High-Tech Careers Need Education and Your Help by Paul O'Shea
Chips and Trends That Are Designing Our Near Future by Paul O'Shea
ID Theft: The Dark Side to Online Finances by Paul O'Shea
Is Mobile Commerce for You? by Paul O'Shea
Is Wireless Ripe or Still Green? by Paul O'Shea
ICANN the Rudder to the Internet by Paul O'Shea
Work Stress - What Work Stress? by Paul O'Shea
An E-Waste Call to Arms by Paul O'Shea
Privacy versus Profits: Are They Mutually Exclusive? by Paul O'Shea
Take Control of Your Investments by Paul O'Shea
RFID Comes of Age for Tracking Everything from Pallets to People by Paul O'Shea

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