Product News I Circuit Components


IQD launches new series of fast make programmable oscillators


OQD has sought to address the problems associated with short lead-times offered by programmable oscillators but typically offset by relatively poor performance in comparison to standard crystal oscillators, especially as regards phase noise and jitter, by unveiling two new ranges of programmable oscillators which have been designed to offer the best of both worlds with phase jitter performance comparable to traditional crystal oscillators but combined with lead-times as short as just 3 days.


Both models, the IQXP-20 clock oscillator and the IQXP-30 voltage controlled oscillator, offer RMS phase jitter down to 0.4ps across all output types. A very wide frequency range from 10.0MHz up to 1.5GHz is available from along with HCMOS output capable of driving 15pF; LVPECL & LVDS outputs are also available at the higher frequencies. Frequency stabilities down to ±10ppm and operating temperature ranges out to -40 to +85 degrees C are available along with the option to specify all inclusive stabilities including temperature range, supply variations, load variations and 15 years ageing at 25°C. Customers can choose from 2.5V or 3.3V supply for both models, both of which are housed in a 5.0 x 3.2mm hermetically sealed ceramic package only 1.2mm high


The IQXP-30 VCXOs are available with a total pull range of ±50ppm minimum and a control voltage nominal of 1.65V. With such a wide frequency range, low phase jitter performance, short lead-times and competitive prices, both models are ideal for use by design engineers on new projects where design-in samples are required on short lead- times as well as for use in mass production in a wide range of applications including Gigabit Ethernet, Video, Telecoms, SCSI, SAS & SATA.


IQD Frequency Products | www.iqdfrequencyproducts.com


VPG releases FRST wraparound chip resistors for high-temperature applications


The Vishay Precision Group’s Vishay Foil Resistors brand (VFR) has released a new series of ultra-high-precision Bulk Metal Z1-Foil wraparound, surface-mount chip resistors for high-temperature applications up to +200°C. The FRST devices are able to provide high- temperature load-life stability and low TCR of ± 2.5 ppm/°C from -55°C to +175°C, 25°C ref. Rated power varies depending upon the chip size.


VFR's Bulk Metal Foil technology's principal advantage has been its insensitivity to temperature changes, a benefit that’s been enhanced in VFR's next-generation Z1-Foil technology. The FRST series incorporates Z1-Foil technology to extend these critical performance features to higher-temperature and higher-humidity environments while maintaining the same low TCR. Each device's solid monolithic alloy element is matched to the substrate, forming a single interdependent structure with balanced temperature characteristics for an unusually low and predictable TCR over a wide range from -55°C to more than +175°C. Resistance patterns are photo- etched to permit trimming of resistance values to very tight tolerances of ±0.01%. The resistors feature load-life stability to ±0.0025% at +70°C for 2,000 hours at rated power and can withstand electrostatic discharges at least to 25 kV without degradation. Offered in six chip sizes from 0603 to 2512, the FRST series features a wide resistance range from 5 Ω to 125 kΩ, with any resistance value within this range available at any tolerance with no additional cost or lead time effect. FRST devices offer a power coefficient down to 5 ppm at rated power within ±25°C of room temperature, and power ratings for the devices range from 750 mW at +70°C to 150 mW at +175°C. The resistors feature a rise time of 1.0 ns with effectively no ringing, a thermal stabilization time of <1 s (nominal value achieved within 10 ppm of steady state value), current noise of 0.010 µVrms per volt of applied voltage (<-40 dB), and a voltage coefficient of <0.1 ppm/V. The RoHS- compliant devices offer a non-inductive, non-capacitive design and are available in matched sets upon request.


The FRST series is optimised for a wide variety of industrial, military, aerospace, medical, down-hole, oil well, and automotive applications requiring resistors to have a minimal drift from their initial values when operating above +175°C and in humid environments. The Z1-Foil technology allows VFR to produce customer-oriented products designed to satisfy unique and specific technical requirements. In addition to the special chip stabilisation under extreme environmental conditions in the production line, additional specially oriented postmanufacturing operations (PMO) are offered for high- temperature applications that require an even higher degree of reliability and stability. "Z-1 Foil technology in general - and the FRST in particular - is another step in tailoring previously unavailable high-reliability, high-temperature resistors to the high-temperature and high-humidity markets. The new FRST resistors provide stabilities well under the maximum allowable drift required by customers' specifications through thousands of hours of operation under harsh conditions, such as the extreme temperatures and radiation-rich environments of down-hole oil-well logging applications, in the frigid arctic, under the sea, in deep space, and especially humidity conditions of 85°C/85% relative humidity," said Yuval Hernik, senior director of application engineering for Vishay Foil Resistors. "All Bulk Metal Foil resistors receive stabilisation processing, such as repetitive short-term power overloads, to assure reliable service through the unpredictable stresses of extreme operation. Compared to Bulk Metal Foil, thick and thin film resistor elements are produced with marginally controllable resistance materials. Heat or mechanical stresses on the resistive elements cause the particles forming the film to expand. After these stresses are alleviated, the particles in the film matrix do not return to the exact original position. This degenerates their overall stability." Samples and production quantities of the FRST series are available now.


Vishay Precision Group | www.vishaypg.com www.cieonline.co.uk


Components in Electronics October 2012 35

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