Hot products: Wi-FI power amp, full-bridge IC driver

www.52RD.com　2006年8月21日　我爱研发网　EEtimes
MANHASSET, N.Y.?Among the hottest products posted at eeProductCenter are a very thin Wi-Fi power amplifier chip, a high-voltage IC driver for high-definition ballast applications, a memory module supporting AMD Opteron1000 Series processors, a data acquisition software application package, a 1.3-mpixel Related Info
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’, FULLHTML,STICKY, MOUSEOFF);‘ style="COLOR: #ff0000; BORDER-BOTTOM: 3px dotted" onmouseout="return nd(2000);">image sensor and a quad driver that can light 32 LEDs.
The power amplifier chip from SiGe Semiconductor Inc. (Ottawa) is claimed to be the thinnest device for Wi-Fi networks. Slated for 2.4-GHz band designs, the RangeCharger SE2523BU device comes in a miniature 16-pin, 3 by 3-mm2 QFN package. The SE2523BU paper-thin package touts a profile of just 0.5-mm (20-mils).
SiGe said its ultrathin design also reduces dissipation by 25 percent compared to competing products, making it suitable for embedding into portable battery-powered consumer electronics. The SE2523BU also integrates digital-enable circuitry, a power detector and biasing circuitry.
The power amp delivers up to +18.5-dBm power output (about 65-mW) with an EVM (error vector magnitude) spec of 2.5 percent (operating in IEEE-802.11g mode). All ACPR (adjacent channel power ratio) requirements are met while operating at +23-dBm output power (200-mW) in 802.11b mode.
The PA’s power detector is also claimed to improve stability since it’s immune to mismatches and exhibits less than 1.5-dB of variation with a 2:1 mismatch. The power detector stage also offers two selectable power detector slopes, permitting it to be used with multiple chip sets.
International Rectifier’s (El Segundo, Calif.) IRS2453D high-voltage, full-bridge IC driver for high-definition ballast applications touts simplified circuitry, previously unavailable features and extended lamp life.
The 600-volt, self-oscillating driver, for general lighting, outdoor street lighting, and projectors, integrates two high-side and two low-side gate drivers. The chip includes a simple RC network to program the oscillator, eliminating the need to synchronize two half-bridge drivers. In contrast, the company said, solutions using two SO-8 driver ICs require a separate oscillator to drive each half-bridge, resulting in unsymmetrical voltages across the load. In lighting applications, the mismatch can cause mercury migration, thus shortening lamp life. The IRS2453D overcomes this problem by driving both half-bridge drivers with a single oscillator to guarantee accurate matching over the complete temperature and supply voltage range.
Simplifying the overall design, the IRS2453D integrates both a latched and nonlatched shutdown input, and eliminates up to seven components. Its latched shutdown circuitry allows for implementation of various protection features such as cycle-by-cycle overcurrent detection, and open-load or short-circuit detection without additional components. The non-latched shutdown circuitry allows for easy interfacing to a microcontroller for use in a wider variety of Related Info
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Available in 14-lead DIP and SO packages, the lead-free device provides 50 percent duty cycle, fixed one microsecond (typical) internal deadtime, and integrated bootstrap circuitry.
Kingston Technology Co.’s (Fountain Valley, Calif.) ValueRAM DDR2 Registered ECC memory modules support AMD Opteron1000 Series processors. The units feature speeds of up to 667 MHz, higher data bandwidths, lower power consumption and enhanced thermal performance, according to Kingston.
The modules are currently available in 256 MByte, 512 MB, 1 GB, and 2 GB configurations to support high-end computing.
Data Translation’s (Marlboro, Mass) quickDAQ is said to be a comprehensive data acquisition software application package. QuickDAQ is a real-time data collection and analysis software application that allows the user to easily acquire, plot, analyze, and save data without programming.
Avago Technologies (San Jose, Calif.) claims its ADCC-3100 is the industry’s first 1/5-inch, 1.3-megapixel CMOS Related Info
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’, FULLHTML,STICKY, MOUSEOFF);‘ style="COLOR: #ff0000; BORDER-BOTTOM: 3px dotted" onmouseout="return nd(2000);">image sensor with advanced image processing, including spot metering, bad cluster detection and auto illuminant detection capabilities for Related Info
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’, FULLHTML,STICKY, MOUSEOFF);‘ style="COLOR: #ff0000; BORDER-BOTTOM: 3px dotted" onmouseout="return nd(2000);">cellphones. The CMOS sensors also enable handset OEMs and camera module assemblers to easily upgrade VGA camera phones or develop ultrathin camera phones.
Linear Technology’s (Milpitas, Calif.) LT3476 DC/DC converter chip contains four independent driver channels that can each drive up to eight 1-amp LEDs in series. Thus the LT3476 can drive up to 32 1-amp LEDs for 100-watt LED applications while delivering efficiencies up to 96 percent.
Each channel provides dimming circuitry, which facilitates a dimming ratio of up to 1000:1. The chip’s fixed-frequency, current-mode architecture ensures stable operation over a wide range of supply voltages (2.8 to 16 volts). A frequency-adjust pin enables users to program the frequency between 200 KHz and 2 MHz to optimize efficiency while minimizing external component size