Clock IC combines low phase noise clock generation with 14-channel clock distribution at jitter levels below 1ps.

Analog Devices is introducing the industry’s first clock IC to combine low phase noise clock generation with 14-channel clock distribution at jitter levels below 1ps. The AD9516 series integrates an integer-N synthesiser, two reference inputs, a voltage-controlled oscillator (VCO), programmable dividers, adjustable delay lines and 14 clock drivers, including LVPECL, LVDS and CMOS. This level of integration replaces several discrete components and, when compared with existing solutions, enables designers to reduce board space and bill-of-materials (BOM) costs for clocking by more than 50%.

In addition, integrating the VCO on-chip greatly diminishes risks associated with the failure of discrete oscillators, improving overall system reliability.

The AD9516’s combination of integration and performance is ideal for applications such as wireless and wired infrastructure, optical networks, WiMAX basestations, medical imaging, automated test equipment and other instrumentation, that require low phase noise and low jitter in the clock path.

‘Global demand for communication services continues to rise, and manufacturers must constantly reduce the size and cost of equipment while maintaining high standards of service and quality’, said Kevin Kattmann, Product Line Director, High-Speed Signal Processing, Analog Devices.

‘For designers working on wireless basestations, optical networks, and telecom applications, the on-chip VCO eliminates a large discrete oscillator, while the 14 output channels will often provide all of the clocks needed on the transceiver or line card, simplifying space considerations and lowering system costs’.

The AD9516 has five versions, each supporting a specific frequency range.

On the high end, the AD9516-0 includes a VCO that tunes from 2.60 to 2.95GHz.

The other parts cover lower frequencies, down to the AD9516-4’s VCO range of 1.50 to 1.90GHz.

Any of the AD9516 family may also be used with an external VCO up to 2.4GHz.

Each device features six LVPECL outputs, which operate up to the maximum VCO rate, as well as four/eight outputs which may be programmed to either LVDS (four outputs maximum) or CMOS (eight outputs maximum) levels.

In LVDS mode the outputs operate to 1GHz, and in CMOS mode the outputs operate to 250MHz.

The AD9516-0/1/2/3/4 devices are packaged in 9 x 9mm, 64-lead LFCSP (lead-frame chip-scale packages) and priced at US $10.75 per unit in 10,000-piece quantities.

C-Mac MicroTechnology reckons it has taken the hard work out of finding the best frequency control component for a particular application with its new online part locator.

C-Mac MicroTechnology reckons it has taken the hard work out of finding the best frequency control component for a particular application with its new online part locator. Using this new tool, engineers simply type their key requirements into an intuitive online form to output a reference table of suitable oscillators, with quick links to the full specification sheet for each. The part locator covers C-Mac’s entire range of standard crystal oscillator products, including OCXOs (oven controlled crystal oscillators), TCXOs (temperature compensated crystal oscillators), VCXOs (voltage controlled crystal oscillators), SPXOs (simple packaged crystal oscillators), factory programmable oscillators for fast delivery, and oscillators approved by communications chipset manufacturers Semtech and Zarlink Semiconductor.

Users first enter four required parameters - output frequency, operating temperature range, frequency stability over temperature range, and supply voltage - and then have the option of also specifying voltage control of output frequency, manual frequency adjustment capability, output waveform, package style and RoHS compatibility.

Other characteristics of each resulting oscillator range can be assessed by viewing the downloadable data sheets.

‘C-Mac’s current frequency product databook is over 300 pages thick, so picking out the best specification for the application at hand is not a trivial undertaking’, said Stuart Clifton, General Manager of C-Mac’s Frequency Control Products business unit.

‘Engineers are busy people, so we thought we’d make life a little easier for them’.

Due to the wide range of parameters that can be specified, it is inevitable that certain combinations will not yield results from C-Mac’s standard product range.

However, the company’s engineers are well versed in producing custom components to individual requirements, and simply hitting the ‘request info’ button will automatically send the specifications to C-Mac for evaluation.

Fox Electronics has a new HCMOS half size, eight-pin DIP oven controlled crystal oscillator.

Fox Electronics has a new HCMOS half size, eight-pin DIP OCXO (oven controlled crystal oscillator). The reduced size of the FHS501AH oscillator makes it particularly useful in portable devices and stems from its use of a smaller crystal, which allows many other individual components in the OCXO to also be reduced. Applications that may utilise the OCXO range from GPS and time code instruments, to basestations, test equipment, synthesisers and digital switching equipment.

The FHS501AH’s small form factor offers the same high frequency stability as a full size OCXO package, at +/-4.6ppm.

It features a frequency range of 10 to 80MHz, supply voltage of 5V +/-5% and an operating temperature range of 0 to +70C.

The RoHS-compliant OCXO measures only 13.2mm square, with a profile of 9.0mm.

Fox’s new half-DIP OCXO is specified for Stratum III service.

Its operating power is 0.5W at 25C and its control voltage is 0.5-5.0V.

Additional specification information is also available.

Euroquartz is launching a wide range of new products .

Frequency control specialist, Euroquartz is launching a wide range of new products at Electronica 2006. Exhibiting alongside its German distributor, WDI, Euroquartz will show a new range of dielectric microwave products, a new 8-pin DIL oscillator for defence and aerospace industries, high performance ultraminiature crystals, low power clock oscillators, an impressively specified LVDS oscillator range and a new high specification range of OCXOs including Stratum III specification products. A new partnership agreement with Chinese manufacturer Caiqin Electronics has extended the capabilities of Euroquartz’s filter product line with frequency range now up to 3.5GHz.

Euroquartz Filters division designs and manufactures custom electronic filters for defence, telecommunications and similar applications and the agreement with Caiqin increases the range of products available to customers.

Applications include RF and microwave communications such as GSM, 3G, GPS, satellite and TV transmission, wireless security systems, radar, aerospace and military.

Also on show will be a new series of military specification clock oscillators for use in aerospace, defence and similar hostile environment applications.

The new EQXO-2000BM series oscillators are housed in the popular 8-pin dual-inline (DIL) package and offer frequencies from 30kHz to 70MHz with frequency stability of either +/-100ppm (2100BM types) or +/-50ppm (2050BM models) over the full military temperature range from -55 to +125C.

For equipment used in space or the upper atmosphere, the EQXO-2000BM series oscillators can be produced in radiation tolerant versions.

Designated EQXO-2000BMH, these parts are designed to withstand ionising radiation enabling the oscillators to resist electrical failures for a total radiation dose of 40krad(Si).

Full screening of components in accordance with MIL-O-55310C, Class B is available to special order.

Euroquartz will also launch two new surface mount crystals housed in microminiature packages: the X42 measuring just 4 x 2.5 x 0.6mm and the X4115 measuring only 4.1 x 1.5 x 0.7mm.

Available in the frequency range from 12 to 50MHz, the new X42 series crystals have a gold-plated ceramic base and a seam welded metal lid providing a stable device with very low ageing.

The rugged construction ensures that these crystals have high shock and vibration resistance.

X42 series crystals are specifically designed for use in small handheld communications devices such as PDAs, GPS and Bluetooth products.

The X4115 crystals provide 32.768kHz output in a package designed to provide the smallest possible component sise for real-time clock (RTC) applications.

Their miniature sise and rugged construction make them ideal for battery-powered, handheld equipment.

New low power clock oscillators - the XOK91 and XOK53 - will also be launched at the show.

Drawing less than 1.7mA, both these series are available in commercial (0 to 70C) and industrial (-40 to +85C) versions running from 1.8, 2.5 and 3.3V power supplies.

A new LVDS oscillator, the 3HD5761, offers impressive specification in a small 7 x 5mm package to provide circuit interfaces for FPGAs, ASICs and similar devices.

Offering frequency range from 100 to 320MHz, the stable duty ratio enables realisation of double datarate (DDR) RAM applications and devices like computer networks, video, graphics cards etc The oscillator also provides an ideal clock signal for high-speed serial communication such as Serial-ATA, Fibre Channel, PCI-Express, Ethernet, HyperTransport, IEEE1394b etc Also being launched is a new high specification range of oven controlled crystal oscillators (OCXOs) including sine wave and HCMOS outputs and OCXOs meeting Stratum III specifications.

Several OCXOs in the range have a choice of AT-cut or SC-cut crystals.

AT-cut crystals offer stabilities from +/-0.1ppm over 0 to +50C and the other, higher-stability part that uses SC-cut crystals offers stability from 10ppb over -30 to +70C.

Two OCXOs are available meeting Stratum III specifications, the OC14T33C for 3.0V operation and the OC14T5C for 5V operation.

Both parts offer HCMOS 47pF output over the frequency range from 1.25 to 40MHz.

Jitter attenuator is optimised for the Xilinx Virtex-4 family of field programmable gate arrays.

Integrated Device Technology has developed a jitter attenuator (ICS874003-02) optimised for the Xilinx Virtex-4 family of field programmable gate arrays (FPGAs). Designed to support PCI Express (PCIe), this component is the industry’s first timing device capable of attenuating or ‘cleaning’ the jitter from a 100MHz PCIe input clock, while translating it to a 250MHz LVDS output. Removing the jitter from the signal enables original equipment manufacturers using the Virtex-4 RocketIO transceivers to achieve 2.5Gbit/s throughput - a critical specification for PCIe communications applications.

The ICS874003-02 is based on the industry-leading IDT FemtoClock technology, designed to cost-effectively generate reference clocks with extremely low, sub1ps RMS phase noise to meet the stringent jitter requirements of PCIe-based communication applications.

The IDT PCI Express jitter attenuator is available in a RoHS-compliant 20-pin TSSOP package.

Murata ceramic resonators now out-perform crystal oscillators on stability, as demonstrated in the latest range available from TTI Europe.

Murata ceramic resonators now out-perform crystal oscillators on stability, as demonstrated in the latest range available from TTI Europe. In recent years, the stability of Murata’s ceramic resonators has progressively approached that of crystal oscillators. It has now surpassed it, with the CSTCE-SK devices providing a replacement for +/-500ppm oscillators.

This latest progress erodes the only remaining advantage of crystal oscillators over ceramic resonators.

Oscillators have always been bigger, heavier and more power-hungry than resonators.

Other advantages for the Murata resonators include a rise time that is approximately 100 times faster.

There is also a load capacitor built-in, which reduces the PCB area requirement and the board-assembly workload.

Devices with this high stability are now in production for 24 and 30MHz frequencies, supporting applications such as the latest high-speed USB interfaces.

Higher frequencies will be available soon.

Reflow soldering and optical positioning are recommended for mounting these parts.

Temex has released a wide range of high-frequency voltage-controlled crystal oscillators (VCXOs) and high-performance oven-controlled crystal oscillators (OCXOs).

Temex has released a wide range of high-frequency voltage-controlled crystal oscillators (VCXOs) and high-performance oven-controlled crystal oscillators (OCXOs). Temex’s 10MHz OCXOs are designed for testing and measurement, switches, GPS synchronisation applications, Vsats and digital audio broadcasting infrastructures. Ideal for switches and synchronisation applications, the DOC5079 is a very cost-effective OCXO solution.

This model has a temperature drift of less than 200ppb.

Its phase noise is at -90dBc/Hz at 10Hz, and its aging is less than 500 ppb per year.

DOC5079 is manufactured in a compact 25.4 x 22 x 10mm surface-mount package.

The DOC5525 is a low noise OCXO solution ideally suited for test and measurement applications.

Phase noise performance is the most critical parameter for testing applications.

This model has an excellent phase noise performance at -127dBc/Hz at 10Hz max.

Its temperature drift is at 20ppb and its aging is less than 100ppb per year.

This OXCO is manufactured in a compact 25.4 x 22 x 15mm SMD package.

Ideally suited for repeaters and WCDMA BTS applications, the DOC5383 is a cost-effective SC-cut OCXO.

Frequency stability versus temperature drift is the most critical parameter for broadband applications.

Temex’s DOC5383 temperature drift is down to 10ppb maximum.

Its phase noise is at -120dBc/Hz at 10Hz.

Finally, this model’s aging is down to 100ppb per year.

DOC5383 is available in a 36 x 26 x 18mm metallic through hole package.

The DOC5204 is a high-stability OCXO for CDMA, Vsat and switching applications.

These kinds of applications typically require a very high thermal stability and optimal aging characteristics.

This model’s temperature drift is down to 0.2 ppb and aging is down to less than 20ppb per year.

Phase noise performance for this device is -120dBc/Hz at 10Hz.

It is manufactured in a 50 x 50 x 38mm metallic through hole package.

Thanks to its experience and knowhow in crystal frequency products, Temex also provides high performance VCXOs for broadband, broadcasting and telecomms applications.

The QEV66 VCXO generates frequencies between 80 and 240MHz, with a very low phase noise (typically -98dBc at 100Hz) and an absolute pulling range of +/-50ppm.

This high-performance VCXO is available with an LVPECL or HCMOS output, and is manufactured in the industry standard 14 x 9 x 3mm SMD package ensuring simplicity of integration.

The QEV66 VCXO, characterised by a frequency stability of +/-15ppm, is ideally suited for telecomms basestations and repeaters and for radio-links for telecomms, broadband, and broadcasting applications.

Nu Horizons Electronics Corp has signed a global partnership agreement for the distribution of Pletronics crystal and oscillator frequency control products.

Nu Horizons Electronics Corp has signed a global partnership agreement for the distribution of Pletronics crystal and oscillator frequency control products. Pletronics’ products service multiple markets which include: industrial, consumer, automotive, communications, telecomms and instrumentation. Pletronics frequency control products (crystals and oscillators) include: PECL, LVDS, CMOS and TTL, crystal clock oscillators (XOs); voltage controlled crystal oscillators (VCXOs), temperature compensated crystal oscillators (TCXOs) and oven compensated crystal oscillators (OCXOs).

‘We are very pleased to be teamed up with an important, leading global distributor like Nu Horizons’, states Claude Lee, President of Pletronics.

‘Pletronics and Nu Horizons share similar business goals, focusing on meeting our customers’ needs through innovation, flexibility and responsiveness’.

‘This partnership provides our company greater global reach and allows us to participate in Nu Horizons’ exceptional demand creation programmes’.

Dave Bowers, President of Nu Horizons Distribution Division adds: ‘Pletronics is a key supplier of crystals and oscillators whose advanced products are a natural complement to many of the other suppliers on our line card’.

‘We look forward to leveraging Pletronics diversified product portfolio to provide our customers with an additional spectrum of high technology products and solutions’.

Fox Electronics now offers a small, silicon-based oscillator with extremely low jitter.

Fox Electronics now offers a small, silicon-based oscillator with extremely low jitter. The LVDS and LVPECL versions of the oscillator, which are part of Fox’s new XpressO family, cost 30% less than traditional LVDS/LVPECL quartz oscillators. Noise reducing DSM technology and proprietary low-noise architecture reduce jitter and phase noise in the 3.3V XpressO oscillator.

Its revolutionary design and application specific integrated circuits (ASICs) allow for accurate performance, reduced costs, shorter lead times and increased flexibility.

The high performance XpressO oscillators are available in LVDS and LVPECL versions for XO packages, and XpressO’s ceramic package sizes are 7.5 x 5.0 and 5.0 x 3.2mm.

Because pricing does not vary depending on package size, there is no penalty for purchasing a smaller package.

The new XpressO oscillators are applicable in a variety of functions requiring extreme stabilities, from HDTV and optical networking, to broadband applications for Internet, as well as video and data transfer.

The XpressO oscillators feature a frequency range from 1.0MHz to 1.1GHz, stabilities as tight as +/-20ppm, and next day shipment for samples and within 10 days for production quantities.

Pricing for XpressO oscillators will vary depending on the output, frequency and stability needed.

Miniature low-cost RoHS-compliant temperature-compensated crystal oscillators offer frequency stability of +/-0.5ppm over the -40 to +85C temperature range.

C-Mac Microtechnology has launched a range of miniature low-cost RoHS-compliant TCXOs (temperature compensated crystal oscillators) offering frequency stability of +/-0.5ppm over the -40 to +85C temperature range. Packaged as a standard 5 x 3.2mm SMD, the new CFPT-127 offers a range of output frequencies between 16.32 and 33.6MHz. The CFPT-127 has been designed specifically for GPS equipment, providing a DC-coupled clipped sinewave output at standard frequencies of 16.32, 16.8, 19.2, 24.5535, 26.0 and 33.6MHz.

Drawing just 2mA (typical) from a 3V supply, its low power requirement and tiny 5 x 3.2mm package size make it ideal for use in handheld and portable receivers, and its +/-0.5ppm temperature stability imparts high sensitivity in detecting and tracking weak signals.

In this way, a tiny low-cost component enhances both the performance and the battery life of GPS systems.

The CFPT-127 is supplied on standard tape and reel and supports lead-free reflow soldering at 260C.

Typical ageing over the first year is +/-1ppm at 25C.

‘GPS technology is fast moving into the mainstream, not least in mobile handsets and automotive satellite navigation systems’, said Mary Carbin, Business Development Manager, frequency control Products, C-Mac Microtechnology.

‘This means that each system component must be competitive in every respect’.

‘Among GPS timing devices, the CFPT-127 represents the best combination of performance enhancing stability, compact design, low price and efficient delivery’.