- Buyers Guide
155.52 MHz TCXOs
These 155.52 MHz temperature-compensated crystal oscillators (TCXO) are available in a 14-pin DIP package with a maximum height of 0.4". The units feature a trim hole to adjust for aging and allow recalibration over time. J-leaded packages are also available. Frequency stabilities of +/-2 ppm from 0° to 70°C are available. The aging rate is estimated to be better than +/-2 ppm for the first year and +/-1 ppm or less in the following years.
Kansas City, KS
Dual-band Subscriber VCO
The model SV-967/1750V dual-band subscriber VCO generates frequencies in band one from 954 to 980 MHz with control voltages from 0.4 to 2.7 V. Band two consists of frequencies from 1720 to 1780 MHz with control voltages from 0.4 to 2.7 V. The unit typically requires 6 mA of current from a +3 V supply voltage. Typical phase noise for bands one and two at 30 kHz offset is -116 and -106 dBc/Hz, respectively. Typical output power for bands one and two is -3 and -4 dBm, respectively. In addition, second and third harmonic suppression are -10 and -20 dBc, respectively. The VCO is housed in a 10.0 mm x 8.0 mm x 2.5 mm surface-mount, pick-and-place/reflow-compatible package.
Vari-L Company Inc.,
Satellite Hand-held Telephone VCO
The model V607TE02 VCO is designed for use in satellite hand-held telephone applications. The unit generates frequencies from 1404 to 1439 MHz within 0.4 to 2.8 V DC of control voltage, making it suitable for quick integration into any PLL where the error voltage can be taken directly from the IC's charge pump circuitry. The unit exhibits a spectrally clean signal of -100 dBc/Hz (typ) at 10 kHz from the carrier. In addition, the low noise device conserves battery life by operating off a 3 V DC supply while only drawing 9 mA (typ). The VCO attenuates the harmonics to better than -19 dBc and operates over the extended commercial temperature range of -25° to +75°C. The pushing specification is less than 5 MHz/V within a five percent change of the supply voltage while pulling is less than 5 MHz with a 14 dB return loss, any phase. Price: $15.95 each (minimum five pieces). Delivery: stock to six weeks.
San Diego, CA
High Frequency Surface-mount VCXO
The VSM series surface-mount voltage-controlled crystal oscillators (VCXO) feature high frequency capabilities up to 100 MHz. Available in four- and six-pin models, the units operate at 5 V DC or 3.3 V with frequency stabilities of +/-20, +/-25 and +/-50 ppm over a temperature range as wide as -40° to +85°C and deviations up to +/-100 ppm over a control voltage range of 0.5 to 4.5 V DC. All models are hermetically sealed in a compact 9 mm x 14 mm ceramic package with a grounded metal case in LCC or solder-dipped J-leaded designs. The VCXOs also feature low jitter of 5 ps RMS (max) and low phase noise performance due to the use of fundamental-mode crystals in the design.
The Connor Winfield Corp.,
GPS Frequency and Time Standard
The model 8 series Global Positioning System (GPS) frequency and time standard features high stability and rubidium options, low distortion sine wave and HCMOS TTL-compatible outputs. The unit offers high immunity to propagation and no ground-wave effect. In addition, the standard is portable and can replace Cesium (which has a limited tube life).
Totnes, Devon, UK
+44 (0)1803 862062.
Programmable Clock Oscillators
The EPO series programmable clock oscillators feature custom or standard frequencies ranging from 1 to 125 MHz. Device performance options include tristate or power-down function, +/-50 or +/-100 ppm frequency stability, and CMOS or TTL output duty cycle. The units are equipped in a 14- or eight-pin DIP hermetically sealed package and a ceramic surface-mount device package. The models EP1100 and EP2500 are 5 V versions while the models EP1300 and EP2600 are 3.3 V versions for lower voltage applications.
Costa Mesa, CA
Low Phase Noise Crystal Oscillators
The FEI-103A series low phase noise crystal oscillators are designed as a reference for communication systems and wireless applications such as cellular telephone base stations. The units feature short-term stability of 1 x 10-11/s and aging of 3 x 10-7/year and 1 x 10-6/10 years. Temperature stability is 1 x 10-10 from -10° to 60°. The oscillator incorporates a double-oven design using a fifth-overtone, SC-cut crystal to ensure good long-term stability and temperature stability. The unit is available in the 5 to 20 MHz frequency range with 10 MHz standard. In addition, typical phase noise is -142 dBc at 10 Hz offset from the carrier, -148 dBc at 100 Hz, -155 dBc at 1 kHz and -158 dBc at 10 and 100 kHz.
FEI Communications Inc., a subsidiary of Frequency Electronics Inc.,
Mitchel Field, NY
1370 - 2000 MHz VCO
The model JTOS-2000 surface-mount VCO is designed for use in wideband frequency synthesizers, measurement instrumentation and phase-locked loop circuit applications operating in the 1370 to 2000 MHz frequency range. Supply voltage and tuning voltage range is 8 V and 1 to 22 V, respectively, and phase noise at 100 kHz offset is a low -115 dBc/Hz. The unit features good harmonic suppression of -11 dBc (typ). Typical 3 dB modulation bandwidth spans 1000 kHz. Price: $19.95 (5-49).
Fixed-frequency and Smart Synthesizer
The model PSF-2510 fixed-frequency synthesizer for wireless applications consists of a basic frequency synthesizer and an internal microcontroller that is used to program the unit's high performance PLL chip. The synthesizer operates at a frequency of 2510 MHz with a current of less than 38 mA and a 5 V supply. Phase noise is -105 dBc/Hz at 10 kHz offset from the center frequency. The surface-mount device has an operating temperature of -40° to 85°C.
Princeton Electronic Systems Inc.,
2400 - 3100 MHz VCO
The model TFC2400A ultra-miniature, low cost VCO is designed for use in applications where high performance, low power consumption and miniaturization are critical. The unit generates signals in the 2400 to 3100 MHz frequency band, offers good linearity in its tuning characteristics and low phase noise. At 10 kHz offset from the carrier, phase noise is better than -86 dBc/Hz (typ). The output signal level is +11 dB while operating with +3 V and 18 mA of current consumption. Size: 0.300" x 0.300" x 0.165".
Synergy Microwave Corp.,
The model VLA925 VCO tunes from 925 to 960 MHz with a tuning voltage of 1 to 8 V. The unit features phase noise characteristics of -122 dBc/Hz (typ) at 25 kHz offset and -154 dBc/Hz (typ) at 800 kHz offset. The model VLA1520 VCO tunes from 1520 to 1660 MHz with a tuning voltage of 1.5 to 8 V. This unit features phase noise characteristics of -142 dBc/Hz (typ) at 800 kHz. Both VCOs operate from a 5 or 8 V DC supply and draw 25 mA (max). Size: 12.7 mm x 12.7 mm x 6.0 mm.
Tekelec Temex Ltd.,
Basingstoke, Hampshire, UK
+44 1256 883340.
Rubidium Master Oscillator
This rubidium master oscillator (RMO) is designed for PCB mounting, allowing system designers an easy method to offer a low cost rubidium option. Pinouts are compatible with some double-oven oven-controlled crystal oscillators and the unit operates off of 12 V DC instead of 24 V DC. The RMO features an internal synthesizer, allowing frequency options to 100 MHz. The standard 10 MHz oscillator is < +/-1 x 10-10 from 0° to +50°C. A -20° to +65°C option is available. The unit can be frequency adjusted and other parameters can be monitored via a computer interface. Small quantities at 10 MHz are usually available within one to two weeks.
Temex Electronics Inc.,
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