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The
Model 4212 servoamplifier comes with a 40-pin internal header that accepts
plug-in resistors and capacitors to tailor the unit for motor and load
combinations. The header requires no soldering to set the operating mode,
current limits, or inductance. The Model 4212 operates from a single-polarity
22 to 125V-dc supply and delivers a continuous output of ±6A, ±12A
pk. A switching frequency of 25 kHz with a 3-kHz bandwidth enables the unit to
drive servo motors having inductance values from 200 µH to 40 mH. The
Model 4212 costs $170 (OEM). Copley Controls Corp, Westwood, MA. (617)
329-8200.
The type N26S oven-controlled crystal oscillator comes in a package measuring 2×2×1 in. The device generates at least 7 dBm into 50[ohm] at 1 to 10 MHz. Harmonics are <–20 dBc. Temperature stability is ±0.05 ppm max over a temperature range of 0 to 50°C. Aging is to within ±0.01 ppm/day max. The device operates from a 15V-dc supply and costs $89.90 (1000). Bliley Electric Co, Erie, PA. (814) 838-3571.
With
a package height of just 1.8 mm, the K50 series of crystal clock oscillators
meets the tight board-height limitation of Type I and II PCMCIA specifications.
The surface-mount clocks are hermetically sealed in ultraminiature ceramic
packages with a welded metal cap. The series, which includes a 3.3V device,
covers frequencies from 8 to 68 MHz with a stability to 50 ppm. Units have a
load rating of 15 or 50 pF, depending on the frequency. The K50 oscillators
typically cost $5, depending on frequency and type (1000). AVX Corp,
Myrtle Beach, SC. (803) 448-9411.
Internally
matched GaAs FETs work in solid-state power amplifiers for 6.4- to 7.2-GHz,
C-band satellite earth-station and microwave point-to-point and
point-to-multipoint communications transmitters. The three devices in the IM6472
series deliver a typical power output of 36.5 dBm (4.5W), 39.5 dBm (9W), and
42.5 dBm (18W) with respective power-added efficiencies of 42, 40, and 38%.
Typical third-order intermodulation for all three devices is –45 dBc. Unit
prices for the 4.5, 9, and 18W devices are $194, $366, and $720, respectively.
Hewlett-Packard Co, Santa Clara, CA. (800) 537-7715.
Joining
a line of RF GaAs ICs, the MRFIC0904 two-stage driver amplifier works in
class-AB operation in applications requiring 800 MHz to 1 GHz. The device uses
depletion-mode GaAs MESFETs to perform at high efficiency from battery voltages
of 3.6 and 4.8V. Suitable for a variety of cellular and cordless telephones, the
MRFIC0904 comes in a plastic surface-mount package and costs $4.72 (low
volume). Motorola Semiconductor Products Sector, Phoenix, AZ. (602)
413-4730.
A reference-powered synchro/resolver amplifier with a 15-VA output comes in a package that you can bolt to the chassis or bulkhead of airborne equipment. The Model 175A400 operates directly from either 26 or 115V, 60- or 400-Hz reference power. Units come with pulsating power supplies, and inputs and outputs are transformer-coupled. You can use the amplifier for buffering roll, pitch, or heading signals. Accuracy is to within ±3 arc minutes for driving passive loads, such as control transformers and control differential transmitters. The Model 175A400 costs $1495. Control Sciences Inc, Chatsworth, CA. (818) 709-5510.
Operating
at frequencies as high as 100 kHz, the DLPVA voltage amplifier lets you adjust
the gain from 20 to 80 dB. Frequency can be 1 or 100 kHz. You can also select
offset voltages and coupling type. You set the amplifier's parameters by
switches on the housing or remotely using a TTL signal. Laser Components
GmbH, 82140 Olching, Germany. +49-8142-28640.
This
connectorized VCO offers 685- to 1025-MHz linear tuning and a typical power
output of 8 dBm. The dual output of the Model ZOS-1025 includes well-isolated
ports (50 dB typ), and frequency settings are virtually independent of the load.
Phase noise is –dBc/Hz at a 10-kHz offset. The ZOS-1025 costs $119.95.
Mini-Circuits, Brooklyn, NY. (718) 934-4500.
The EL2142C differential line receiver increases the distance and rate of data transmissions by accurately amplifying small differential signals in the presence of noise commonly found in transmission systems using twisted-pair wiring. With the EL2140C and EL2141C line drivers, the EL2142C forms a high-speed data transceiver capable of reliable communications at 5× the typical transceiver distance at speeds >100 Mbps. The device operates from a single or split 5V supply, dissipating 55 mW. Packaging options include eight-pin DIP and SO configurations. Prices start at $2.79 (1000). Elantec Inc, Milpitas, CA. (408) 945-1323.