- Buyers Guide
The model CTO-2605AH2 temperature-compensated, voltage-controlled crystal oscillator (TCVCXO) is available in a slimline SMT package 2.5 mm high, allowing downsizing of mobile telephones, modems and other mobile and fixed-line communications equipment. The device is available in a range of frequencies from 9.6 to 36 MHz, and offers a standard tolerance specification of +/-2.5 ppm over an operating temperature range of –30° to +75°C. After assembly, a voltage control feature allows correction for crystal aging effects (+/-1 ppm/year, max) and temperature variations. The TCVCXO can be powered from a +3 V +/-5 percent or +5 V +/-5 percent DC power source, with supply voltage tolerance of +/-0.2 ppm (standard). Maximum current consumption is 2 mA.
C-MAC Quartz Crystals Ltd.,
Harlow, Essex, UK 01522 883500.
The Seiko Epson SG-8002 series oscillator blanks are designed to drive down lead times and price. These oscillator blanks are manufactured in volume and frequency programmed at the point of manufacture or distribution using phase-locked loop and programmable read-only memory technology to produce drop-in equivalents to current Seiko Epson types. Bulk manufacture and reduced stock volumes lower cost. The new oscillators will be frequency programmable in the frequency range from 1 to 125 MHz at 5 V, 1 to 90 MHz at 3.3 V. Preproduction volumes are expected to be deliverable within two weeks of order; production quantities in three to four weeks.
Advanced Crystal Technology,
Newbury, Berkshire, UK (01635) 528520.
Wideband Varactor-tuned Gunn Oscillator
This wideband varactor-tuned Gunn oscillator can be used as a driver for TWT amplifiers, as a phase-locked source with wide tuning range, and as a source in a spread spectrum system and multiplier chain. In K- and Ka-bands, the unit provides an output power of +15 dBm (min) across a tuning bandwidth of 15 and 10 percent, respectively, of the center frequency. The output power flatness is 2 dB (typ) over 10 percent of the center frequency. This performance is achieved by a highly coupled varactor in the series design. An isolator is integrated to the oscillator to prevent load pulling effects of the Gunn diode. A regulator also is provided to protect the Gunn diode from damage due to excessive DC bias or reverse polarity. Also available are oscillators with similar characteristics for use in Q-, V- and W-bands.
South Deerfield, MA (413) 665-8551.
The model 108 series oven-controlled crystal oscillator (OCXO) operates over a frequency range from 5 to 50 MHz, weighs less than 15 grams and measures 0.50 cubic inches. The unit uses either a precision AT or SC crystal to achieve a wide range of performance and cost levels. Temperature stabilities can be as low as +/-10 ppb from –40° to +85°C. AT versions of the OCXO are suited for microwave and synthesizer applications that require more economy while maintaining a high level of performance. The temperature performance for AT versions is as low as +/- 50 ppb from –30° to +70°C with aging rates as low as 200 ppb per year. Both AT and SC models are equipped with electronic frequency adjust, allowing for calibration or steering of the oscillator manually or through software control.
Carlisle, PA (717) 243-5929.
Fixed-frequency SAW Oscillator
The model HO2000 1 GHz fundamental frequency surface acoustic wave (SAW) oscillator features a typical output power of +10 dBm. Phase noise at 10 kHz offset is –130 dBc/Hz. Power supply is +5 V/40 mA. The operating temperature range is –20° to +70°C. Packaged as a small-size, 14-pin dual in-line package device, the oscillator is designed for use in high frequency signal generators and frequency multipliers. Price: less than $100 each (100).
RF Monolithics Inc. (RFM),
Dallas, TX (800) 704-6079 or (972) 448-3700.
Wideband Microwave Synthesizer
The model SYN-2600-4720-2005-10E-M3-P low cost, wideband synthesizer is designed for use as an LO. The unit features a wide output bandwidth range of 2600 to 4750 MHz. Output power is +12 dBm (typ) and accepts a 10 MHz reference input. Phase noise is –115 dBc/Hz (typ) at 1 MHz offset from the carrier with a parallel interface.
RF Prototype Systems,
San Diego, CA (800) 874-8037 or (619) 689-9715.
Sinewave Surface-mount VCTCXOs
The ES6300 and ES6400 series sinewave surface-mount, voltage-controlled, temperature-compensated crystal oscillators (VCTCXO) are available in custom frequencies ranging from 10 to 22 MHz with standard frequencies of 12.8, 13.0, 14.4 and 19.2 MHz. Applications for the oscillators include GPS, RF, microwave and telecommunications. Stabilities from +/-3 to +/-1.5 ppm and temperature ranges extending from –30° to +75°C offer good performance capabilities for any application. Product options include six- or four-pad configuration, 5 or 3 V supply voltage and external or internal trim. Tape-and-reel packaging is available in 1000-piece increments with delivery from stock to 10 weeks.
Costa Mesa, CA (800) 325-4783.
Low Phase Noise VCO
The model 10-800-4002-000 VCO tunes from 1064 to 1071 MHz from 0.7 to 5 V. Single side-band phase noise at 10 kHz offset is –116 dBc/Hz. The VCO operates at 8 V/30 mA (max) with a tuning linearity of 1.5:1 (max) and power output of 1 dBm +/-1 dB. Other frequencies/bandwidths are available.
TRAK Microwave Corp.,
Tampa, FL (813) 884-1411.
The model RTXO-119 SMT TCXO features high stability over both time and temperature with an output frequency that is specified to remain within +/-2.5 ppm over the operating temperature range from –30° to +75°C. Aging is better than +/-1 ppm per year and a +/-5 ppm trimmer adjustment is provided on the top side of the surface-mount package. The TCXO’s voltage-control feature provides frequency modulation for the output signal to carry voice and data. Frequency pullability is specified at a range of +/-4 ppm, according to an input control voltage from 0.5 to 4.5 V. The unit is powered by a single supply (either +3 or + 5 V DC) and output voltage is a 1 V p-p clipped sinewave that is capable of driving a 10 kW load shunted by 10 pF. Price: $9 each (1000). Delivery: 10 weeks (ARO).
Raltron Electronics Corp.,
Miami, FL (305) 593-6033.
1805 - 1880 MHz Miniature VCO
The model V613ME04 miniature VCO features low single sideband phase noise and tuning sensitivity. The oscillator exhibits spectral purity of –105 dBc/Hz (typ) at 10 kHz from the carrier while generating frequencies between 1805 and 1880 MHz within a tuning voltage range of 1 to 8 V DC. The VCO typically draws only 18 mA from a nominal 5 V DC source while operating over the temperature range of –40° to 85°C. The oscillator has a pulling response less than 5 MHz with 14 dB return loss, any phase, and a pushing specification better than 2 MHz/V within five percent of the nominal supply voltage. Size: 0.50" x 0.50" x 0.22".
San Diego, CA (619) 621-2700.