Class-D digital amplifier made for flat-panel TVs Product News 5/31/2005 Post a comment Review: This digital-input Class-D audio power amplifier from Texas Instruments Inc. is said to enable the development of flat-panel displays (FPDs) with sound quality that matches the display's high-quality image, while minimizing cost and component count.
Shift Happens Power DesignLine Blog 5/31/2005 Post a comment The combination of advanced control methods and novel power stage designs will spawn an entire new breed of power supplies that redefine state-of-the-art performance benchmarks.
ICs charge lithium-ions from AC or USB Product News 5/31/2005 Post a comment Linear Technology's LTC4075 and LTC4075X are stand alone dual-input linear battery charger ICs that automically select the charging source (either a wall adapter or a USB port) for single-cell lithium-ion batteries. Using a constant-current/constant-voltage algorithm, the chargers, for application in PDAs, MP3 players, portable test equipment, and cell phones, can deliver up to 950 mA from a wall adapter or 500 mA from a USB supply.
EM Microelectronic's smart card IC offers flexible memory positioning Product News 5/31/2005 Post a comment EM Microelectronic announces the EMTCG176-3G, a flash memory-based smart card IC designed for use in SIM and Java cards for GSM mobile phones, as well as for healthcare and loyalty card applications. The EMTCG176-3G is compatible with the ISO7816-3 Integrated Circuit Card (smart card) specification, and operates with high speed communication baud rates, making it compatible with the 3rd generation of cellular telephones.
Gas Gauging: Art or Science? Design How-To 5/27/2005 Post a comment Battery ICs are very sophisticated and must keep up with the demand for accurately calculating battery performance for the wide variety of battery types. Each calculation method has differing elements and resolutions and introduces possible errors into the equation, which affects the battery's potential long-term maximum performance. Here's what you need to know to get the most out of your battery.
Flat panels capitalize on cool, clear Class-D audio technology Design How-To 5/27/2005 Post a comment Opinion: Class-D technology provides several benefits as an audio power amplifier solution. The amplifier's efficient operation minimizes heat, thereby eliminating the need for heat sinks, and also reduces overall power consumption, which helps reduce the transformer and regulator size and cost.
Dual controller daisy-chains for multitracking Product News 5/26/2005 Post a comment Linear Technology's LTC3828 is a dual step-down switching controller with integrated tracking for sequencing multiple voltage rails, a phase-locked loop (PLL) for precision synchronization, and PolyPhase operation for reducing input capacitance and noise. The chip, which enables the design of compact multiple output power supplies in applications such as single-board computers, industrial equipment, automotive electronics and FPGA-based systems, can daisy chain to multiple LTC3828s or other DC/D
AKM low power stereo DAC has built-in 3D enhancement Product News 5/26/2005 Post a comment Asahi Kasei Microsystems (AKM) has introduced the AK4368, a low power stereo DAC with built-in 3D enhancement, high output headphone amplifier and PLL - all features that make it ideal for ultra-compact mobile phones, smart phones and PMPs.
How to drive switching devices without losing speed Design How-To 5/26/2005 Post a comment The monolithic high-side drive poses a fascinating challenge for system designers. Simply put, designers need to find a way to drive the switching devices as easily as possible - without suffering from lack of speed. Enter a high-voltage process for the high-side gate driver IC and the conventional high-side driver topology.
Dual-output regulator simplifies notebook designs Product News 5/25/2005 Post a comment Maxim Integrated Products' MAX8737 is a dual, high-power, linear-regulator controller that (with external n-channel MOSFETs) provides two independent low-voltage supplies for notebook computers, point-of-load regulators, and low-voltage bias supplies. The chip, working from a nominal 5 volts, delivers a highly regulated 0.5 to 2.5 volts at each output (no-load accuracy is ±5 mV), with the external MOSFETs faciliating a scaleable current design that provides good load regulation (±1 p
Clock extraction circuitry times high-speed communications test News & Analysis 5/24/2005 Post a comment A critical aspect of the receiver circuit decision process is ensuring that the "0-or-1" decision process occurs at an optimal time. Some form of clock signal must be provided to the decision circuit to time the decision process, writes Agilent's Greg Le Cheminant. But this signal must be highly synchronous with the incoming data stream. Just a small offset in frequency between the data rate and the receiver clock, he says, will degrade the BER. Greg's tutorial on clock-data recovery (CDR) in th
Wide-input voltage SEPIC drives high-power white LEDs Design How-To 5/24/2005 Post a comment One challenge in using white LEDs in many applications is powering them with the wide input voltage range that batteries present. A battery-to-LED DC/DC converter must both step up and step down the source voltage to a typical 6.8V LED forward voltage required for a camera flash - and keep the LED current constant (for constant luminosity). From the May issue of Planet Analog magazine, a Linear Technology Corp. engineer offers a SEPIC circuit that does the job.
The organizational side of power management: One engineers perspective Blog 5/24/2005 Post a comment Even with jobs going overseas, the age-old conflict between engineering and marketing has not diminished. In this departure from diodes, MOSFETs and loop currents, Sanjaya looks at the organizational side of power management projects. The vocal, technology-grounded engineer may too often be the unwanted child in a "King's Court," he worries.
Video converter renders dual images Product News 5/24/2005 Post a comment National Semiconductor Corp. today introduced what it claims is the first dual-channel video format converter for high-definition television that features two video conversion channels and a dual 3-D architecture.
Tiny log amp spans 1 MHz to 10 GHz Product News 5/24/2005 Post a comment Designed to measure and control RF signals, Analog Devices' new log amp is optimized for accuracy, power, and size in order to target wireless infrastructure, broadband wireless and radar applications.
Quad wideband noise canceller accelerates interconnect speeds by up to 400% Product News 5/24/2005 Post a comment The Nx2000 is a VLSI analog device that integrates eight of the company's channel emulator cores, each with fully adaptive phase, amplitude and frequency control. It can cancel eight network aggressors from four victim channels dynamically in under a square inch of board area. As a result, channel throughput is improved by up to 400%, according to the company.
LED controller puts on a light show Product News 5/23/2005 Post a comment Dialog Semiconductor's new DA9026 controller is designed to program up to 18 light-emitting diodes (LEDs) for running the "fun lights," light shows, and backlighting in cellular handsets, handheld games, and other portable devices. It incorporates on-chip memory to store up to 15 light-pattern sequences and can drive separate red, green and blue LEDs (i.e., six RGB LEDs) using precision current d/a converters (DACs). Programmable variables include pattern, repetition rate, intensity of each LED,
Camera-flash driver is one of the brightest Product News 5/21/2005 Post a comment Sipex Corporation says its SP6686 current-regulated buck/boost charge pump offers one of the smallest solutions in the industry for white-LED camera flash applications in cell phones. The chip's low equivalent output resistance facilitates the highest flash brightness of any comparable IC device, according to the company.
Motor driver IC touts extra protection Product News 5/20/2005 Post a comment Zetex Semiconductors' ZXBM1015 is a motor pre-driver IC for variable or fixed speed control of single-phase brushless DC fans, blowers and pumps. The chip, which delivers a PWM output suited to an (external) H-bridge that drives the motor windings, includes a current monitor that keeps the motor's start-up and stall current within OEM specifications. The ZXBM1015 will also put the motor drive outputs into a safe operating mode during a locked rotor condition to protect the H-bridge and motor win
DC-DC Conversion for Power over Ethernet Design How-To 5/19/2005 Post a comment In the next few years power-over-Ethernet is expected to become a standard feature on all high-end switches and routers for voice over Internet protocol (VoIP) and LAN wireless. Here's some in-depth help designing an isolated dc-dc converter that can be used in Powered Devices for Power over Ethernet applications.
Cree licenses white LED patent News & Analysis 5/19/2005 Post a comment Cree Inc. announced Thursday it has licensed its white LED patent to several strategic chip customers, including Stanley Electric Co. Ltd., and Rohm Co. Ltd., both of Japan, and Cotco Holdings Ltd. (Hong Kong).
Controllers power their way into the digital loop Product News 5/18/2005 Post a comment Controller chip recap - Power management ICs are progressing quickly towards more digital control and the so-called digital power supply in all its various forms. The pros and cons of digital versus traditional analog designs, set against economic feasibility issues, still have strong supporters on both sides. Few designers, however, dispute the benefits of an ideal "digital" system: High integration, fewer analog parts, faster control response, higher accuracy, tighter regulation, and easy cust
Married to bipolar: the op amp technology of last resort Design How-To 5/17/2005 Post a comment "What is it that keeps 21st century op amp designers living in the 60s?" asks consultant designer Scott Elder. "The answer," he says, "lies deep inside the thousands of manufacturer datasheets: The Specifications." Read why he feels that op amp design, in CMOS, is something of a compromise, and why bipolar remains the mournful favorite among those who know.
PCIe-to-PCI-X bridge offers low power in small package Product News 5/17/2005 Post a comment Designers eager to upgrade their PCI designs to the rapidly growing PCI-Express (PCIe) interconnect standard should take a good look at this bridging chip that is said to offer the smallest package and lowest power consumption of any PCIe device on the market. The PLX ExpressLane PEX 8114 PCIe-to-PCI-X bridge is packaged in a 17-mm X 17-mm standard plastic BGA, and burns a maximum of 2-Watts of power. It consumes about 25% of the board space and offers power dissipation at about a quarter of com
Chip-Prozess verbessert Sensor-Auswertschaltungen News & Analysis 5/17/2005 Post a comment Analog Devices (ADI) will diese Woche einen bipolaren Fertigungsprozess vorstellen, der gleich drei Fliegen mit einer Klappe schlägt: Das Verfahren der Verarbeitung von Sensoren mit schwachen Signale nicht nur geringes Rauschen und hohe Empfindlichkeit bescheren, sondern auch einen hohen Spannungsschutz für industrielle Umgebungen bieten.
TI data converter strategy hinges on new product ramp Product News 5/17/2005 Post a comment In the aftermath of its annual financial analysts' meeting (May 11th), Texas Instruments Inc. elaborated on its strategy in data converters ICs. The company's market positioning relies heavily on multi-market building blocks with attention-getting specs. Steve Ohr reports.