Integrated features cut component count in phone line IC
Product News 3/31/2005 Post a comment
The newest member of Clare, Inc.'s phone interface IC family for direct access arrangements (DAA) in telephony apps features simultaneous phone line ringing detect and caller-ID monitoring, which simplifies DAA designs for international telephone applications.
Ericsson takes the lead in removing lead
Special Report 3/31/2005 Post a comment
OEMs are getting serious about lead-free manufacturing in the face of consumer pressure and forthcoming legislation. Ericsson Power Modules is staying well ahead of the game with lead-free products that are designed for lead-free assembly lines.
Design How-To 3/30/2005 Post a comment
FPGAs are designed using advanced technologies to achieve smaller process geometries, the voltages needed to run these devices are getting lower. This creates the need for a carefully considered power management solution for FPGA based applications.
M-LVDS receivers keep it safe with multi-level fault detection
Design How-To 3/30/2005 Post a comment
Designers have integrated LVDS devices into systems as diverse as wireless basestations, projection TVs, plain-paper copiers and handheld consumer electronics. But there is no standardized response to line fault conditions. Multi-drop LVDS receivers effectively detect open-circuits, short-circuits, line disconnects and disabled drivers. This failsafe approach works over the full input range of receiver, but requires some attention to clocking. A Texas Instruments' engineer shows how.
Tiniest charger-with-DC/DC powers Bluetooth
Product News 3/30/2005 Post a comment
Texas Instruments' bq2501x family, combining a precision USB/AC charger system and a synchronous DC/DC converter, charges and powers portable systems from either an AC adapter or USB port with autonomous power source selection. Billed as the smallest battery charger-with-converter available for space-limited portable applications, the bq25010, in a 3.5-by-4.5 mm QFN for single-cell lithium-ion batteries, is optimized for Bluetooth headsets and accessories.
Glitch-free buck-boost outperforms SEPICs
Product News 3/29/2005 Post a comment
Product Review - Linear Technology touts its LTC3780 as the only "true buck-boost controller" IC today, i.e., one that generates no glitches whatsoever during (seamless) switching transitions from the buck to boost mode and vice versa, or for input transients or step changes in load. Designs using it are simpler (especially with respect to magnetic design considerations) and perform better in many applications than the popular single-ended primary inductance converter (SEPIC), according to the c
Austin's "magical mystery tour"
News & Analysis 3/28/2005 Post a comment
American Technology Research hosted a bus tour in Austin, Texas last week where a group of investors (clients of AmTech) met with executives from SigmaTel, Freescale, and Silicon Labs. The bus trip finished up with a tour of Solectron's Austin plant. Here are some of the key takeaways from that meeting, presented by AmTech analyst Doug Freedman.
Analog buoys ADSL modem
Teardown 3/28/2005 Post a comment
he Siemens SpeedStream asymmetric digital subscriber line (ADSL) Model 5100 modem represents a typical client-side terminus to the broadband world. But despite the "digital" nature of the transmission standard, analog technology plays a critical role in properly interfacing to the less-than-optimal twisted-pair phone line environment in which ADSL operates, where pulse shaping and signal filtering are key.
Differential amps drive 12-bit A/D converters
Product News 3/27/2005 Post a comment
Today National Semiconductor Corp. unveiled two high-speed, low-distortion differential amplifiers and two high-speed, low-power, 12-bit analog-to-digital converters (A/D converters) that provide the most accurate signal capture at the lowest power consumption.
"Failsafe" clocking mechanism offers clock switchover
Product News 3/25/2005 Post a comment
Micrel's SY8984x series of high bandwidth 2:1 multiplexers prevent short cycles ("runt pulses") when switching from one clock to another. Such a feature is important in data center and other mission-critical applications, in which a cough or short-cycle could result in false data triggers. While a number of manufacturers promote this form of clock switching, Micrel's architecture may be unique in that it does not rely on a phased-locked loop (PLL).
Sipex adds high-efficiency white-LED driver
Product News 3/24/2005 Post a comment
Sipex Corporation's SP6687 charge pump, with a peak efficiency of 95 percent, independently controls up to four white-LEDs for backlighting color displays in portable applications such as cell phones, digital cameras, portable MP3 players and PDAs.
How you can manage multiple voltages in portables
Design How-To 3/23/2005 Post a comment
There is a need for digitally programmable power management control functions to meet the increasingly stringent supply rail requirements. Here's a new "platform solution" that can change to meet any type of system power supply requirement that eases the designer's job.
Linear versus switching power supplies - Part 4 of an introduction to analog circuit design
Design How-To 3/22/2005 Post a comment
As complexity builds, linear circuits become impractical, consequently at a system level switching circuits tend to prevail. With switching regulators we trade noise for efficiency as these circuits are inherently efficient but also inherently noisy due to their switching nature. In part 4 of Reno Rossetti's tutorial on analog building blocks, he covers the foundations of switching regulators, the other crucial elements of power conversion and power management.
Analog codecs pave the way for voice calls on the Internet
News & Analysis 3/21/2005 Post a comment
Local phone companies are now getting on board with VoIP (Voice over Internet Protocol), although they seldom call it that. "Unlimited long distance calls, $29.95." (Why scare customers with something nerdy sounding?) In actuality, it's not a new service, but rather takes advantage of the long-term telephony trend toward packetizing data in order to find its cheapest transmission path. From IEC and Texas Instruments tutorials, Steve Ohr offers this overview.
Power management of a different kind
Power DesignLine Blog 3/21/2005 Post a comment
Outsourcing is a form of power management by companies to stay competitive. One country has created an economic development model to deal with this thorny issue. Will it work here?
Addition by subtraction
News & Analysis 3/21/2005 Post a comment
National's interest in selling off its super I/O business was basically applauded by Ross Seymore of Deutsche Bank's Equity Research Group. The sale allows National to concentrate on its high margin analog efforts. Here's the text of Seymore's remarks.
Exar claims industry's first multi-channel 66MHz PCI 3.0 compliant UART
Product News 3/21/2005 Post a comment
Among analog building blocks, it is very often the "bread-and-butter" items that prove to be most useful. The Universal Asynchronous Receiver/Transmitter (UART) may lack some of the drama of a 24-bit analog-to-digital converter or a GHz op amp, but it provides a consistently reliable means of moving data from one place to another. Steve Ohr has a look at some 66-MHz PCI-compliant UARTs for telecomm servers.
Charge pump fields both camera lighting and flash
Product News 3/18/2005 Post a comment
Advanced Analogic Technologies' first multi-function charge pump IC, the AAT2801, simultaneously supports white LED backlight and camera flash functions for portable systems powered by lithium-ion/polymer batteries. The device, actually two charge pumps in one, uses one charge pump to drive up to four LEDs for backlighting, delivering up to 30 mA on each current source output. The second charge pump's circuitry delivers a peak output of 300 mA for flash.
California Micro says growth is slowing
News & Analysis 3/17/2005 Post a comment
Semiconductor supplier California Micro Devices said Thursday (March 17) it expects revenue for its fourth 2005 quarter ending March to be between $13.8 and $14.5 million, compared to $17.8 million in the prior quarter and $15.8 million in the same quarter a year ago.
Power-factor IC initiates the "high-density" cycle
Product News 3/16/2005 Post a comment
International Rectifier credits its proprietary "one cycle control" topology in its IR1150 family of µPFC devices for cutting real-estate requirements in half for power-factor-correction (PFC) chips in 75-watt to 4-kW applications. The family, which is designed to combine the best of traditional continuous conduction mode (CCM) and discontinuous current mode (DCM) PFC controllers, delivers 0.999 power factor correction with only 4 percent total harmonic distortion, according to the company.
Saving space is more than talk for smartphone PMICs
Product News 3/16/2005 Post a comment
Maxim Integrated Products' MAX8621Y/MAX8621Z power management ICs (PMICs), acclaimed for space-constrained portable devices with multiple-voltage requirements such as digital cameras, cellular handsets and especially smartphones, contain two 4-MHz DC/DCs, four low-dropout (LDO) regulators, a reset timer, and an open-drain driver. In a 4-by-4 mm QFN package, the chips offer a significant reduction in footprint, occupying less than 30 percent the real-estate of an equivalent discrete solution, acc
Bluetooth system-on-chip poses MSIG design challenges and tradeoffs
Design How-To 3/16/2005 Post a comment
An engineer at Dialog Semiconductor looks at the design challenges and tradeoffs involved in the design and implementation of complex mixed signal ASICs for Bluetooth transceivers. He reviews Bluetooth standard, and assesses the design challenges and tradeoffs suggested with various implementation and production methodologies. Among the issues he wrestles with are standards compliance and testing, complexity management, hardware-software (HW/SW) codesign, and RF-specific technology issues.
Accurate and Lossless Current-Sensing Techniques for Power Applications -- A Practical Myth?
Design How-To 3/16/2005 1 comment
The power supply is the backbone of any electronic device, and its performance is especially critical in the growing mobile consumer market. For the safety, performance, and feedback control of these switching supplies, it is often necessary for the circuit to better understand its loading environment, especially load current. Protecting the supply circuits, for instance, against overloading and short-circuit conditions requires the system to self-monitor its current delivery. Here's how it can
Freescale's Mayer sees single-digit growth
News & Analysis 3/15/2005 Post a comment
The semiconductor industry can expect at best single-digit growth in the coming years because no industry can "outgrow the GDP," the chief executive of Freescale Semiconductor said Tuesday (March 15) at the Semico Summit here.
DC/DC steps up to active-matrix LCDs
Product News 3/15/2005 Post a comment
Maxim Integrated Products' MAX8727 provides a regulated 24 volts from a 2.6-5.5 volt input for powering active-matrix, thin-film transistor LCDs (AMLCDs). The current-mode, fixed-frequency PWM boost controller, with built-in n-channel MOSFET, delivers high efficiency (90 percent, nominal), fast loop performance.
Noise-canceling headphones: analog margin-makers
Teardown 3/14/2005 Post a comment
Spending too much time on airplanes? Looking for ways to blot out the jet noise (or that overly-chatty person sitting next to you)? David Carey takes apart a noise-canceling headphone to find those microphone and amplifiers while redline a series of signal for suppression.