Crystal Oscillator has high-frequency differential outputs.
November 3, 2009 -
Model DS4625 LVPECL crystal oscillator produces dual-output-frequency combinations ranging from 100-625 MHz. It ensures jitter performance of less than 1.0 psec RMS at 12 kHz to 20 MHz for high current, high frequency, and differential output applications. Packaged in 5 x 3.2 mm LCC, it is based on LC-PLL IC that uses fundamental AT-cut crystals, so operation isn't affected by frequency deviation. Product operates in temperatures from -40 to +70°C.
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Original Press release
Maxim Integrated Products
120 San Gabriel Dr.
Sunnyvale, CA, 94086
USA
Compact, Dual-Output Crystal Oscillator Provides High-Frequency Differential Outputs and Robust Jitter Performance for Demanding Communications Applications
SUNNYVALE, CA - October 28, 2009 - Maxim Integrated Products (NASDAQ: MXIM) introduces the DS4625, a dual-output LVPECL crystal oscillator designed for demanding communications applications. This device produces dual-output-frequency combinations ranging from 100MHz to 625MHz, allowing designers to replace two oscillators with a single device. Packaged in a 5mm x 3.2mm LCC, the DS4625 is 55% smaller than conventional solutions (5mm x 7mm). This device ensures leading-edge jitter performance [< 1.0psRMS (12kHz to 20MHz)] for high-current (95mA to 105mA, typ), high-frequency (> 100MHz), differential-output (LVPECL) applications. The DS4625 is thus ideal for communications systems that require high-performance clock generation such as Fibre Channel, Ethernet, 10G Ethernet, SONET/SDH, InfiniBand®, GPON, BPON, PCI Express®, and SAS/SATA.
The DS4625 solves the heat dissipation problems typically encountered by small ceramic packages in high-frequency, high-current designs. An integrated thermal pad provides thermal relief for the crystal element, thus ensuring reliable operation over the entire -40°C to +70°C temperature range. The DS4625 is manufactured using fundamental AT-cut crystal technology-with no overtones-and a low-noise PLL-based oscillator designed in Maxim's SiGe foundry. The overall design provides extremely low aging of < ±7ppm over 10 years, and exceptional frequency stability characteristics of less than ±50ppm, including variations due to voltage, temperature, initial tolerance, and aging. Compared to competitive devices such as SAW-based oscillator designs, the DS4625 offers a smaller footprint, comparable jitter performance, and better stability (±50ppm versus ±100ppm or greater) across a wider -40°C to +70°C temperature range.
Third-overtone oscillator designs provide for robust phase-jitter performance and good stability versus temperature, but can suffer from undesired spurious modes of operation as package size and crystal resonator size decrease. Spurious modes are generally excited based on temperature, which results in significant frequency deviations from the desired nominal frequency. In addition, third-overtone designs provide limited frequency operation with maximum frequencies of approximately 200MHz.
Because the DS4625 design is based on a robust LC-PLL integrated circuit that uses fundamental AT-cut crystals, spurious modes of operation resulting in extreme frequency deviation are not possible. Additionally, the PLL-based design easily accommodates operating frequencies up to 622.08MHz and higher if desired. Standard frequency combinations for the DS4625 include: 100/150, 125/125, 125/156.25, 150/150, and 150/200MHz. Custom frequency combinations are also available-please contact the factory for availability.
Prices start at $9.70 (1000-units, FOB USA) and vary depending on frequency combinations. Samples are available now.
Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells high-performance semiconductor products. The Company was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, it has developed over 6100 products serving the industrial, communications, consumer, and computing markets.
Maxim reported revenue in excess of $1.6 billion for fiscal 2009. A Fortune 1000 company, Maxim is included in the Nasdaq 100, the Russell 1000, and the MSCI USA indices. For more information, go to www.maxim-ic.com.
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