- Buyers Guide
1.2 GHz/550 MHz Dual Fractional-N PLL IC
The model PE3292 phase-locked loop (PLL) IC (part of the company's FlexiPower series) designed for frequency synthesis is fabricated in the company's patented UTSi® CMOS process. Each PLL includes a FlexiPower prescaler, phase detector, charge pump and onboard fractional spur compensation. The prescalers are supplied power on dedicated pins and can operate at a power savings at voltages as low as 1 V while allowing a 3 V charge pump supply. For 3 V only systems, onboard voltage regulation can be used to generate the prescaler power supplies. The 32/33 RF prescaler (PLL1) operates up to 1.2 GHz and the 16/17 IF prescaler (PLL2) operates up to 550 MHz. The IC provides fractional-N division with power-of-two denominator values up to 32, allowing comparison frequencies up to 32-times the channels spacing (which provides a lower phase noise floor than integer PLLs).
Peregrine Semiconductor Corp.,
San Diego, CA
5.8 GHz Reflective Transponder
The model CHR2242 5.8 GHz reflective transponder is dedicated to short-range communication applications and is available in a plastic package. Features include an ultra-low standby current and CMOS-compatible inputs/outputs. An application board is available to evaluate the transponder rapidly. The unit can also be used in road pricing systems, remote identification and factory production control systems in wireless mode.
United Monolithic Semiconductors SAS,
Orsay, Cedex, France
DC/DC Converter/Switching Regulator ICs
The TK651xx series DC/DC converter/switching regulator ICs provide reduced EMI filtering and shielding while maintaining the high efficiency of a CMOS design. The units operate from either single- or dual-cell supplies, providing regulated 2.7, 3.0 and 3.3 V outputs with a startup voltage of 0.9 V. The output voltage is monitored by an internal comparator and provides a reset signal if the output falls below a specified minimum level. Available in a small SOT-23L surface-mount package, the ICs provide up to 30 mA output current in single-cell applications. Price: starts at 89¢ (1000).
Toko America Inc.,
Mount Prospect, IL
3 V RF Receiver IC
The model TQ5121 3 V RF receiver IC integrates a GaAs MESFET RF LNA, buffered LO input, GaAs MESFET mixer and IF output amplifier in a single, small RFIC. The unit features a conversion gain of 17.5 dB (typ), noise figure of 2.7 dB, input IP3 of -8.5 dBm (min) and operating temperature range of -40° to +85°C. This performance is achieved with a single operating voltage of +2.8 to +3.6 V and 10 mA of current. The unit is supplied in a 16-pin, QSOP-16 package and includes an internal 50 W input match that minimizes PCB area. Price: $2.69 (1000).
TriQuint Semiconductor Inc.,