UPDATE.APR–Crystal oscillators–wy Product Update: Crystal
Oscillators
Here is a sampling of crystal oscillators introduced over the last 10
months or so
Miniature TCXO exhibits good long-term stability
This 14-pin DIP temperature-compensated crystal oscillator, part number
TC2178AN, covers the frequency range from 6 to 25 MHz. Key features
include an aging stability of (+/-)1 ppm for 1 year and (+/-)5 ppm for 5
years. The input voltage is (+/-)5 Vdc, with an oscillator frequency
stability of (+/-)0.05 ppm with 5% voltage change. Frequency stability
with temperature is only (+/-)1 ppm over the temperature range from -40
degrees to +85 degreesC. Single-sideband phase noise is -60 dBc at 1 Hz to
-130 dBc at 1-kHz offset. An optional voltage-control function is
available with the oscillator. The TC2178AN measures only 0.46 (L) x 0.72
(W) x 0.35 (H) in. ($40 ea/1,000–samples 2 to 8 weeks, prod qty 12 to 14
weeks ARO.) Murata Erie North America Smyrna, GA Sales 800-831-9172
Oscillators drive ECL devices
ME Series oscillators are low-level, high-speed crystal clock oscillators
designed for driving high-speed ECL chips operating in the range from 40
to 200 MHz. The oscillators are available with pin 7, pin 14, or pin 1
case ground. Alternatively, they are available with no case ground.
Stabilities to +/-50 ppm from 0 degrees to +70 degreesC and +/-100 ppm
from -40 degrees to +85 degreesC are available. Supply current is 35 mA
typ, 60 mA max. ($13.28 ea/1,000–4 to 6 weeks ARO.) M-tron Industries,
Inc. Yankton, SD Rick Linduski 605-665-9321 Fax 605-665-1709
2300
Data clock oscillator has tri-state output
The K1300 data clock oscillator is a high-frequency TTL/CMOS data clock
with tri-state output. It is designed primarily for applications requiring
fast rise and fall times, such as high-speed workstations and
high-resolution graphics. Rise and fall times are each 5 ns max. The
frequency range is 70 to 125 MHz. Other features include a frequency
stability of +/-0.01% (+/-0.005%); typical symmetry of 45%/55%; and a
drive capability of 50 pF for the CMOS version. The K1300's metal,
hermetically sealed package has a footprint of 0.820 x 0.520 in. The
package can be soldered in standard wave-line operations without damage.
Insulated standoffs permit proper cleaning. ($11.70 ea/100–4 to 6 weeks
ARO.) Champion Technologies, Inc. Franklin Park, IL Pete Wruskyj
708-451-1000 Fax 708-451-7585
Oscillators for ultra-small computers and disk drives
L1280 Series crystal clock oscillators are designed specifically to
accommodate the greatly reduced voltage, power, and size requirements of
pocket-size personal computers and disk drives. The oscillators operate
from an input voltage of 3.3 V, making them suitable for notebook
computers. Moreover, the oscillators have a seated height of only 0.
160-in., making them well suited for not only notebook computers, but disk
drives as well. The oscillators can drive 30-pF or 10-TTL loads and cover
the frequency range from 1.8432 through 125 MHz, with a choice of 0.01%,
0.025%, or 0.05% stability. (50 MHz, $2.45 ea/1,000–8 to 10 weeks ARO.)
MF Electronics Corp. New Rochelle, NY Marty Finkelstein 914-576-6570
Fax 914-576-6204
Oscillator provides tight stability in battery-powered
applications
The MCXO (Microcomputer Controlled Crystal Oscillator) employs a
high-stability overtone SC-cut crystal and microcomputer-controlled
compensation instead of an oven to achieve (+/-)3 x 10-8 -ppm
stability. Thus, with a maximum power consumption of only 75 mW, this
oscillator is well suited for battery-powered applications where power
requirements of an ovenized oscillator are prohibitive. It is also suited
for applications where fast warmup and high-accuracy are required.
Standard MCCO output frequencies are 10 MHz and 1 kHz; other frequencies
are optional. The MCCO is available in commercial, industrial, and
military versions, including radiation-tolerant designs for military and
space applications. (Commercial version, from $500 ea/500–stock.) Q-Tech
Corp., Culver City, CA Brian Rose 310-836-7900 Fax 310-836-2157 EEM
FILE 2900
Surface-mount TCXOs have power-saving sleep mode
These ultra-small temperature-compensated crystal oscillators are
contained in a 32-pin leadless ceramic chip carrier package only 0.450 (L)
x 0.550 (W) x 0.141 (H) in. They are claimed to be the smallest completely
integrated CMOS TCXOs available. The oscillators, designated the NTC-1000
Series, are available over a range of 2.1 to 20 MHz. They provide either a
square-wave or a sine-wave output. A programmable sleep mode allows the
user to disable the output signal for reduced current drain. While in this
mode, the oscillator and its compensation circuits remain operational to
maintain frequency stability. Frequency adjustment is provided by a serial
peripheral interface or by an optional dc voltage frequency adjustment.
($18.55 ea/1,000–8 to 10 weeks ARO.) NEL Frequency Controls, Inc.
Burlington, WI Chuck Ulland 414-763-3591 Fax 414-763-2881
Clock oscillators drive 68000 microprocessors
K68EC clock oscillators are designed specifically to drive Motorola
MC68EC040 and MC68LC040 microprocessors. A choice of TTL-compatible output
frequencies includes 40.0000, 50.0000, 66.6667, and 80.0000 MHz. A
tri-state output-inhibit function is standard. Frequency stability is
(+/-)100 ppm. Aging is (+/-)10 ppm/yr. The K68EC comes in a 14-pin
DIP-compatible package and measures 0.81 x 0.51 x 0.22 in. high (20.7 x
12.9 x 5.13 mm). Power requirements are 4.5 to 5.5 Vdc, 45 mA max. ($5 to
$8 ea/1,000–10 weeks ARO.) AVX Corp., Myrtle Beach, SC Tom Wight
803-448-9411
Small ovenized crystal oscillator is very stable
The CO-738S ovenized crystal oscillator exhibits aging rates of only 5 x
10-8 /year and temperature stabilities of +/-1 x 10-9
over a 0 degrees to 50 degreesC range and 1 x 10-8 over -40 degrees
to 75 degreesC range. The oscillator warms up to better than 3 x
10-8 in less than 3 min. Available frequencies range from 32 kHz to
32 MHz, and to 50 MHz with slightly relaxed specifications. Sine wave or
logic outputs are available. The CO-738S package measures only 1.5 (L) x
1.25 (W) x 0.86 (H) in., and is suitable for pc-board mounting. ($373
ea/100–12 to 14 weeks ARO.) Vectron Laboratories, Inc. Norwalk, CT
Larry Jawitz 203-853-4433 Fax 203-849-1423
Low-profile oscillator is only 0.310 in. high
The Model X03016C TCXO is a small, low-profile oscillator–only 1.125 in.
2 and 0.310 in. high–that provides a standard output frequency of
21.95 MHz. Optional frequencies are available between 15.0 and 23.5 MHz.
Oscillator stability is (+/-)4 ppm over a -45 degrees to 70 degreesC
temperature range, with an aging performance of less than 5 ppm over 10
years. Output is a 1-Vp-p sine wave into 1 k Ω. A 5-Vdc supply
voltage is required for operation. ($300–12 weeks ARO.) Piezo
Technology, Inc. Orlando, FL Paul Dechen 407-298-2000 Fax 407-293-2979
VCXO fits high-speed datacom applications
The VC-7000 Series voltage-controlled crystal oscillator is for use in
high-speed board- and box-level modems, instrumentation, imaging, high-end
audio, and other applications requiring high stability and fast,
wide-range phase-locked loops. The oscillators are well suited for data
links operating at 56 Kbaud and faster. Frequency stability is +/-25 ppm
and aging is (+/-)1 ppm/year. Output drive is specified at 10 TTL loads or
15 pF for HCMOS loads. The oscillators operate from +5 Vdc and draw 35 mA.
Superimposed modulating frequency is up to 10 kHz at -3-dB points, with
output linearity of (+/-)10% or better. Output rise/fall times are 10 ns
or better; operating temperature range is 0 to +70 degreesC. ($15. ea/1,
000–8 to 12 weeks ARO.) Raltron Electronics, Inc. Miami, FL Sandy
Cohen 305-593-6033 Fax 305-594-3973
SMD oscillators come in many styles
This line of ceramic, hermetically sealed oscillators is available in ECL
and CMOS logic, and in voltage-controlled and temperature-compensated
models. The oscillators cover a frequency range from 1.8432 to 360 MHz.
The package has a metal cover to minimize EMI and gold-plated contact pads
to improve solderability. Shipment in tape-and-reel for automatic
placement is available. (From $35 to $175–prototypes 6 to 8 weeks ARO.)
Conner-Winfield Corp. Aurora, IL Barney Ill 708-851-4722 Fax
708-851-5040
Ovenized oscillator has low phase noise
The Model 2890080 crystal oscillator fits commercial communications,
instrumentation, and GPS applications. It uses SC-cut crystals and has a
frequency range from 30 to 110 MHz. Typical phase noise at 100 MHz is -95
dBc/Hz at 10 Hz, -125 dBc/Hz at 100 Hz, -153 dBc/Hz at 1 kHz, and -165
dBc/Hz at 10 kHz. Aging rate at time of shipment is 3 x 10-9 /day.
The oscillator's frequency stability is (+/-)5 x 10-8 over a
temperature range of -40 degrees to +70 degreesC. Its vibrational
sensitivity is 1 x 10-9 /g. The oscillator measures 2.00 (L) x 2.00
(W) x 0.75 (H) in. ($500 to $600 ea/500–8 to 10 weeks ARO.) Piezo
Crystal Co. Carlisle, PA Jon P. Lehr 717-249-2151 Fax 717-249-7861 EEM
FILE 2300
Ovenized oscillator has low profile
The Model TK802 hybrid ovenized oscillator operates over a 50 to 100-MHz
frequency range with a temperature stability of (+/-)0.05 ppm over a -20
degrees to +70 degreesC temperature range. Fast warmup time (less than 5
min) achieves 5 x 10-8 stability at +28 V/250 mA heater current.
The TK802 has phase noise performance of -135 dBc/Hz at 1 Hz and -155
dBc/Hz at 10 kHz. Standard output power is +7 dBm min; higher output power
is optional. The oscillator's hermetically sealed package meets
MIL-STD-883 fine leak requirements. ($790–6 to 8 weeks ARO.) ST
Microsonics Corp. Weymouth, MA Ken Lambert 617-337-4200 Fax
617-337-4208
SMD VCXO fits many applications
The VXS1815C surface-mount sine-wave voltage-controlled crystal
oscillator is available at frequencies ranging from 60 through 150 MHz at
a frequency stability of (+/-)10 ppm from -20 degrees to 75 degreesC. The
voltage-control function typically provides for (+/-)50 ppm of pull range
over a 1 to 4-Vdc bias range. A trimmer is incorporated to permit
adjustment of the nominal frequency after the VXS1815C is connected into a
circuit. The oscillator measures 18.4 (L) x 11.8 (W) x 4.7 (H) mm, and
operates on 5 Vdc at less than 5 mA. ($20 ea/10,000–12 weeks ARO.) TEW
North America Norcross, GA Michael Watson 800-762-0420 Fax
404-441-3076
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