- Buyers Guide
The CFPV-41/42/43/44 series miniature surface-mount voltage-controlled crystal oscillators (VCXO) are designed for SONET/SDH transmission systems in local telephone exchanges and local or wide area networks. The oscillators offer a high degree of frequency pulling (control of the output frequency via an applied voltage), thereby allowing degraded incoming signals to be corrected to nominal frequency via a phase-locked loop. Frequency pulling is up to ±50 ppm (CFPV 41/42) and up to ±100 ppm (CFPV 43/44). The VCXOs operate over a temperature range of -10° to +70°C at any output frequency between 1.0 and 52 MHz, including the standard fixed-line telecommunication frequencies at 8.192, 10 and 38.88 MHz. Price: from $3.50 to $11.30.
C-MAC Frequency Products, Durham, NC (919) 941-0430.
The model 312BE subminiature temperature-compensated crystal oscillator (TCXO) has a frequency range of 12,600 to 19,800 MHz. Frequency tolerance is -0.5 to +0.5 ppm at 25°C and frequency stability is -2.5 to +2.5 ppm over an operating temperature range of -20° to +75°C. Designed for surface-mount applications, the TCXO has low profile packaging with a ceramic base and a metal cover and measures 7 mm x 5 mm x 2 mm. The unit requires a supply voltage of between +2.85 and +3.15 V and input current is 2.0 mA (max). Storage temperature range is -40° to +80°C. Price: $8 (1000). Delivery: eight to 10 weeks (ARO).
Fox Electronics, Fort Myers, FL (888) 438-2369.
Voltage-controlled Ovenized Crystal Oscillators
The K2000 series voltage-controlled ovenized crystal oscillators (VCOCXO) are designed specifically for Stratum 3 timing and synchronization applications. Housed in a compact, hermetically sealed DIL 14 package, the VCOCXOs operate with +5 or +12 V DC power supply voltages. With a +12 V supply, frequency stability is less than ±100 ppb over the temperature range of 0° to 70°C. Overall frequency stability including temperature, voltage, load and aging is less than ±370 ppb/day. Phase noise is less than -95 dBc/Hz at 10 Hz and voltage control (pull-in/hold-in) function is greater than ±10 ppm with deviation linearity less than 10 percent. Standard frequencies are available up to 20 MHz with optional frequencies up to 38.88 MHz. Price: starting at $75 (1000).
Champion Technologies Inc., Franklin Park, IL (800) 888-1499.
Commercial Wideband VCO
The model VCO190-1500BT generates frequencies from 1000 to 2000 MHz with control voltages from 0.5 to 20 V. The unit typically requires 23 mA of current from a supply voltage of 8 V. Phase noise is -94 dBc/Hz at 10 kHz offset (typ), output power is +6 dBm (typ), and typical second and third harmonic suppression is -20 and -30 dBc, respectively. Housed in a surface-mount, pick-and-place reflow-compatible package, the unit measures 0.50" x 0.50" x 0.18".
Vari-L Company Inc., Denver, CO (303) 371-1560.
Low Noise VCO
The model MW500-1109 wideband, low noise voltage-controlled oscillator (VCO) covers an octave from 1250 to 2500 MHz while maintaining a low phase noise of -117 dBc/Hz at 100 kHz offset and -93 dBc/Hz at 10 kHz. Output power is +6 dBm, supply voltage is 5 to 12 V and tuning voltage is 0 to 18 V. Designed for satellite communication, frequency synthesis, test equipment and video transmission applications, the VCO is capable of high FM rates and modulation BW over 40 MHz. Operating temperature range is -40° to +85°C. Size: 0.50" x 0.50" x 0.14".
Micronetics Wireless Inc., Hudson, NH (603) 883-2900.
805 - 825 MHz VCO
The model V580ME09 high performance VCO covers the 805 to 825 MHz frequency range with a tuning voltage of 0.5 to 4.5 V DC, allowing quick and easy implementation into phase-locked loop circuits. The unit provides 5.5 ±2 dBm of output power into a 50 W load. Phase noise is -110 dBc/Hz at 10 kHz offset, input capacitance is 120 pF (max) and second harmonic suppression is -12 dBc (typ). Operating temperature range is -30° to 85°C. The VCO is well suited for spread spectrum radio, data link and digital cellular applications. Size: 0.50" x 0.50" x 0.13". Price: $15.95. Delivery: stock to six weeks.
Z-Communications Inc., San Diego, CA (858) 621-2700.
100 - 800 MHz VCXOs
The M303 series VCXOs have expanded to include frequencies from 100 to 800 MHz. Originally designed for SONET applications, these high performance VCXOs are well suited for high speed computing or telecommunications applications as well as network computing, base stations, high end servers, data communications transmission and automatic test equipment. A standard device provides temperature stability of less than 30 ppm over an operating temperature range of 0° to 70°C. Delivery: stock to 12 weeks (ARO).
Micro Networks/Andersen Laboratories, Worcester, MA (508) 852-5400.