A Multi-Output Power IC to Power Multi-Rail Applications Design How-To 8/31/2005 Post a comment Using a multiple-output power IC to power a multiple-rail application, such as an FPGA and/or DSP, is highly desirable because of its simplicity. Due to its flexibility, a controller-based multi-rail power IC can incorporates two controllers and a linear regulator. A Texas Instruments engineer shows how this design allows the user to optimize the solution size to accommodate the wide-range of possible voltages and currents associated with DSP and FPGA power solutions.
Designing with ultra-low voltage MOSFET arrays Design How-To 8/31/2005 Post a comment Using a floating gate charge, Advanced Linear Devices has perfected a way of programming the threshold voltages of MOSFET arrays. With something close to a zero-volt threshold, MOSFET switches can be turned one-or-off with a hare's breath of power. But this will force designers of portable circuits to think differently about the design of their amplifiers, voltage references and current mirrors, suggests developer Robert Chao. This article offers some insights and suggestions.
LED driver claims world on a string Product News 8/31/2005 Post a comment Austriamicrosystems bills its AS3691 chip as the world's first high-current with high-precision LED driver. "The IC's absolute current accuracy of 0.5 percent allows for highly accurate brightness settings and is thus ideal for supporting sophisticated color management applications like LCD monitors with RGB backlighting," said Ronald Tingl, marketing manager for Power Management. The AS3691 includes four independent high precision current sources each capable of sinking 400 mA (for four strings
Codec expands portable features Product News 8/31/2005 Post a comment Wolfson Microelectronics plc introduced a stereo codec for portable multimedia apps, including cellular phones that is said to integrate high-quality audio performance and enhanced mixing capabilities, with low-power consumption.
Beginning a new series: The most common mistakes in analog macro design Design How-To 8/31/2005 Post a comment IC designer Ken Boorom has seen a number of design weaknesses that even experienced IC designers and managers overlook. Because the same mistakes are made by different engineers working for different companies, Ken believes it would be worthwhile to compile a list of them. Invariably, the problems are related to the way that the analog IPs interact with their environment.
Planet Analog invites you to join us for an informative series on all the little gotchas (sometimes big ones) that come in
Tracker/sequencer ICs ease basic power-up designs Product News 8/30/2005 Post a comment Maxim Integrated Products' MAX6877-MAX6883 are dual/triple power-supply trackers/sequencers for controlling power-up and power-down of up to three rails. They're the company's first hardware programmable (versus programmable memory) trackers and sequencers for cost-effective design in simplified power management systems. Users adjust key performance parameters such as voltage thresholds, slew rates, and timing parameters with (external) resistors and capacitors.
Online tool speeds amp selection Product News 8/30/2005 Post a comment Analog Devices Inc.'s amplifier parametric evaluation tool is said to create a virtual evaluation board environment to remove the guesswork from selecting and implementing operational amplifiers.
16-bit converter targets precision apps Product News 8/30/2005 Post a comment This 16-bit, 10 Msamples/second delta-sigma analog-to-digital converter from Texas Instruments Inc. features 86 dB signal-to-noise ratio and 95 dB spurious-free dynamic range over a 5-MHz bandwidth.
Regulator delivers the boost to bias LCDs Product News 8/30/2005 Post a comment Allegro MicroSystems' A8483 is a 1.2 MHz step-up regulator chip suited for general purpose battery-powered work as well as such applications as bias/backlighting supplies for plasma and liquid-crystal displays. Other applications include cellular phones, PDAs, camcorders, personal stereos, MP3 players, cameras, and mobile GPS systems.
Ramtron acquires Goal Semiconductor News & Analysis 8/30/2005 Post a comment Nonvolatile ferroelectric random access memory supplier Ramtron International Corp. has acquired fabless semiconductor supplier Goal Semiconductor Inc., for $7.6 million in cash and stock.
Decoder boosts compatibility between video formats Product News 8/29/2005 Post a comment National Semiconductor Corp.'s video decoder is said to increase compatibility between different video standards allowing consumers to output video directly from DVD players, gaming devices and other devices to their PC monitors.
Power IC with charger boosts management potential Product News 8/26/2005 Post a comment Summit Microelectronics' multi-output SMB122, a second-generation power management IC equally at home in either single lithium-ion cell or AC-input applications, brings power regulation and advanced power control to the designer's table. Indeed, this chip is billed as the world's first multi-output power IC that includes a fully programmable battery charger.
12-bit A/D converters conserve board space Product News 8/26/2005 Post a comment Maxim Integrated Products Inc.'s 12-bit family of
tiny, high-speed, analog-to-digital converters feature two true-differential inputs, 3 V or 5 V single-supply operation, and a SPI-/QSPI-/MICROWIRE-compatible interface.
Medical Electronics Pumping Ahead Design How-To 8/25/2005 Post a comment According to the Databeans latest study, the home medical market presents a large opportunity for semiconductor manufacturers, especially chips for precision amplifiers, data converters, analog power management, and RISC processors.
JFET in-amp housed in MSOP Product News 8/24/2005 Post a comment Analog Devices Inc. said it's breaking ground with its first junction field effect transistor-input instrumentation amplifier, which is the smallest in the industry and offers the highest common mode rejection ratio.
Stand alone charger expands options Product News 8/24/2005 Post a comment The LTC4076 and LTC4077 are Linear Technology’s second and third standalone linear lithium-ion battery charger chips with dual-input USB and AC adapter ports and offer designers various options to the company's earlier released LTC4075/X. The main differences between the LTC4075/X and the second and third offerings are in available current from the USB port and the devices' charge termination capabilities.
Single-ended to differential buffer serves single-supply A/Ds News & Analysis 8/24/2005 Post a comment Differential inputs of an A/D converter must be balanced to cancel even order harmonics and common mode noise. Systems often require this signal translation to take place without injecting dc bias currents back into the signal source. Analog Devices' engineers offer a buffer circuit for single-ended to differential signal conversion.
Too good to be true, but why not shown? Blog 8/24/2005 Post a comment The difference amplifier circuit seemed to work well; it was nice and linear in fact. But there was something not quite right: There would be attenuation at certain frequencies. Not very much, but troublesome nonetheless. It had something to do with balancing the resistors in the compensation loop, Bill Klein concluded. Watch him go to work on "A Call We Took Last Week."
Battery IC extends charge to cut parts Product News 8/23/2005 Post a comment Advanced Analogic Technologies' AAT3687 BatteryManager, for single-cell lithium-ion/polymer batteries, is designed to further cut external parts count in portable consumer applications.
USB bus-powered devices put an end to Wall Warts Design How-To 8/23/2005 Post a comment “Every system that supplies power must incorporate some kind of power limits. You don’t want your computer to go dark when you plug in a mouse,” writes a Cypress Semiconductor engineer in this month's issue of the Planet Analog magazine folio. On the other hand, plugging USB disk drive could generate some hefty current surges. Let's think about eliminating those Wall Warts, he says.
Regulators peak for high-current systems Product News 8/23/2005 Post a comment National Semiconductor's LM2716 buck-boost and LM2717 buck-buck, two regulators designed for high-current applications, feature greater than 90 percent efficiency over a wide load range for extended battery life in embedded computer systems, set-top boxes, portable Internet access devices, general point-of-load architectures, and monitors and TVs, including TFT/LCD flat-panel displays.
A fast, accurate, LC compliant DC-DC boost regulator…Is it possible? Design How-To 8/23/2005 Post a comment Circuit integration is a major trend in the electronics industry. For power management designs, the frequency compensation circuit is a critical roadblock since it is off-chip. A user-friendly, accurate, fast, highly LC-tolerant supply circuit is therefore in high demand. Here's a proposed bypass scheme that offers just about everything needed.
Three-in-one battery charger IC Product News 8/22/2005 Post a comment A battery charger from AnalogicTech combines a charging device, reverse blocking diode, and current sensing circuit. It supports charging currents up to 1.5A across an input voltage range of 4.0 to 5.5V.
TFT-LCD regulator offers a cool way out Product News 8/22/2005 Post a comment Touting extremely high efficiency and thus cooler system operation, the EL7585A quad-output regulator from Intersil provides a highly integrated power source for large (19 inches and greater) thin-film-transistor liquid-crystal displays (TFT-LCDs) of the kind used in TVs and desktop monitors. Its so-called boost supply boasts the industry’s largest integrated field-effect transistor for this application, providing up to 3.5 amps.
LED driver with PFC simplifies street lighting Product News 8/19/2005 Post a comment Supertex' HV9931, an off-line driver for single high-brightness LEDs, includes a power factor correction stage that thus suits the chip to traffic signal, street lamp and decorative lighting applications. The fixed-frequency buckboost-buck design features built-in dimming capability.
D/A converters offer robust performance Product News 8/19/2005 Post a comment Maxim Integrated Products Inc. introduced 10 low-power, high-dynamic-performance, 12-/14-/16-bit, dual digital-to-analog converters (D/A converters) with update rates up to 500 Megasamples/second.
Power switches crow super current rating Product News 8/18/2005 Post a comment Micrel Inc. launched a family of high-current power switches for PCs, set-top-boxes, game controllers and USB host devices, as well as the latest printers, which all require current limiting protection against short circuits.
PoE controller adds DC/DC Product News 8/18/2005 Post a comment Texas Instruments' third generation power-over-Ethernet device, the TPS23750, combines the functionality of the company's TPS2375 powered device (PD) controller with a primary side DC/DC pulse-width modulation (PWM) controller. Thus it effectively manages device discovery and classification as well as delivery of direct-current (DC) power to an end appliance to ease implementation of Ethernet-powered systems such as IP phones, security networks, and RFID scanners. Relatively few external compone
30ON Semi’s ESD suppression devices meet toughest protection standards Product News 8/18/2005 Post a comment ON Semiconductor has introduced the ESD (micro ESD) dual series of high performance, micro-packaged electro static discharge (ESD) protection diodes. The ESD dual series is designed to protect voltage sensitive components for two lines in applications that demand minimal board space and low profiles, such as cell phones, MP3 players and portable gaming systems.