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1010 results found, displaying items 441 - 460
Take The PGA Tour Through Analog-Digital Interfacing
Lying at designers' fingertips is an ever-widening range of programmable-gain amplifiers (PGAs) to handle the interface between real-world analog outputs of sensors/transducers in data-acquisition systems and the digital world of signal processing....
Analog & Power: Synchro-To-Digital Converter Has 16-Bit Resolution
A series of single-module, two-speed synchro-to-digital converters offers 16-bit resolution and ±0.005° accuracy. The devices convert two-speed synchro or resolver inputs of 11.8, 26, or 90 V at 400 Hz or 90 V at 60 Hz into 16-bit parallel...
Embedded: 16-Channel ADC PC/104 Card Has 16-Bit Resolution
The Stratus-X-ND PC/104 analog-to-digital converter (ADC) card has 16 16-bit A-D channels, backed up by a 1-Msample FIFO. Priced at $495, it's rated from −40°C to 85°C. Other versions are available with dual 16-bit analog outputs....
VME A/D Board Drives Dual PowerPC FPGAs
Analog Devices' 210-MHz AD9430 feeds a pair of Xilinx Virtex II Pro FPGAs on Pentek's 6U 6821. Each FPGA incorporates a pair of PowerPC 405 cores. The FPGAs and quad processors can process the analog input and deliver it to front- or rear-panel,...
High-Efficiency Class D Audio Amp Goes Filter-Free
The originator of the "best-in-class" Boomer audio technology, National Semiconductor Corp., has unveiled a filterless, high-efficiency Class D Boomer audio amplifier. It comes in a tiny micro nine-bump surface-mount device (SMD) package that suits...
Data-Converter Trio Zeroes In On High-Level Motor Control
Two high-performance data-converter ICs, coupled with a monolithic resolver-to-digital converter (RDC), add advanced motor control to industrial and automotive applications. These Analog Devices chips include the AD7266 analog-to-digital converter...
What's All This Mnemonic Stuff, Anyhow?
"On Old Olympus' Topmost Top, A Fat-Eared German Viewed A Hop." Isn't it amazing? I read that back in '56 in Sinclair Lewis' Arrowsmith. That is a little rhyme to help medical students remember all the nerves in the head. I never learned all...
Analog & Power: Resolvers Measure Speed, Position In Demanding Environments
The Harowe line of resolvers suits motor speed and position measurement where inherent durability is required. Frameless units range from size 10 to size 55, while housed resolvers range from standard-grade size 11 to heavy-duty, industrial-grade size...
Analog & Power: Current-Feedback Amplifier Provides High Bandwidth
With high bandwidth at both low and high gains, the OPA695 low-power, current-feedback amplifier will find homes in video signal processing, cable modems, and test instrumentation. At higher gains (G = +8), the device offers a 4300-V/µs slew rate...
Bob's Mailbox
Hi Bob: A coworker in Denmark informs me that Bang & Olufsen forbids transistors to drive capacitive loads without some form of series impedance. ("A foolish consistency is the Hobgoblin of small minds." /rap) This came about due...
Low-Distortion 2.5-GHz Op Amp Squelches Noise
Using its BiComm-III complementary bipolar silicon-germanium process, Texas Instruments rolled out the THS4304 2.5-GHz (unity gain bandwidth) wideband voltage-feedback op amp with total harmonic distortion of −70 dBc (at 32 MHz, 2 V p-p into a...
Communications: 210-MSPS ADC + 2 FPGAs = Board For High-End Communications
The Model 6821, a 6U VME plug-in board, contains a single 210-Msample/s, 12-bit analog-to-digital converter (ADC) that provides 100-MHz + Nyquist bandwidth. The ADC is coupled to two Xilinx Virtex-II Pro FPGAs, creating a combination that's well...
Op Amps Play Major Role In New Digital Technology
The advent of the worldwide Web and expansive, new video displays that significantly magnify artifacts, smearing, and color imbalance has created a daunting challenge for amplifier developers. They must achieve near-zero signal degradation during...
What's All This Noise Gain Stuff, Anyhow?
On my recent seminar tour, I asked about 4000 engineers, "How many of you use noise gain?" About 2% of the people held up their hands. Sigh. Noise gain is often not very important or critical. That is one of the reasons why op amps are so...
Accelerating The Design Cycle In A Converging World
The headline is so common: "Design Engineers Face Increased Time-To-Market Pressures." Whenever I see such a headline, I smile. Is there ever enough time, budget, or staff to develop a new design and meet all of the project's expectations?...
3-Msample/s 16-Bit SAR ADC Sports 1-LSB Accuracy
High-speed 16-bit successive-approximation-register (SAR) analog-to-digital converters (ADCs) are available, but many of them sacrifice integral and differential linearity (INL and DNL) to achieve high speeds. However, Analog Devices' AD7621 16-bit...
Low Noise, Wide Dynamic Range Define 14-Bit, 125-Msample/s ADC
Featuring more than half the power dissipation of other available 14-bit analog-to-digital converters (ADCs), Texas Instruments' ADS5500 125-Msample/s ADC maintains high performance with resolution higher than any comparable device. Also, its power...
Analog & Power: Two-Channel, 14-Bit ADC Samples Simultaneously At 3 Msamples/s
The 14-bit LTC1407A and 12-bit LTC1407 3-Msample/s analog-to-digital converters (ADCs) have two simultaneous inputs. The two conversion results are delivered sequentially to DSP serial ports through a three-wire serial peripheral interface. The...
Analog & Power: White-LED Drivers' Analog Dimming Results In Reduced Output Noise
The option of an integrated true analog dimming mode in a pair of white-LED drivers offers a noise-free alternative to pulsed dimming control. The ZXLD1100 (six-pin SC70 package) and ZXLD1101 (SOT-23-5 package) inductive boost converters can produce...
Online Design Environment Demystifies Op-Amp Puzzles
The specification of operational amplifiers requires designers to sort through a rat's nest of parameters. There are dozens of suppliers, selection guides, databooks, and FAEs to consult. To make the task easier, National Semiconductor's "Amplifiers...
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