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Clock generators achieves 500fs RMS jitter

Posted: 28 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:clock generator? RMS jitter low? crystal oscillator?

Texas Instruments Inc. has unveiled three new precision clock generators that have a crystal input, replacing up to four discrete high-frequency crystal oscillators with a single device. The devices provide a more cost-efficient solution that saves up to 50 percent more board space compared to similar solutions. The CDCM61004 family improves system performance by achieving integrated RMS jitter of 500fs, well suited for data communications equipment.

The CDCM61004 family eases board design by providing a fully integrated voltage-controlled oscillator (VCO) support for a wide output frequency range from 43.75MHz to 683MHz, allowing one device to cover multiple standards or multiple designs. The clock generators operate at less than 500mW to enable high-density designs, offering up to 30 percent power savings.

The clock generators provide input reference including the commonly used crystal frequencies such as 24.8832-, 25- and 26.5625MHz. The family's on-chip VCO operates in frequency range 1.75GHz to 2.05GHz, supporting output from 43.75MHz to 683MHz. It also includes input crystal bypass mode that allows direct tuning on the reference as well as output selectable between LVPECL, LVDS or 2-LVCMOS.

The CDCM61004 pin-compatible family allows the same hardware strapping while its high integration and flexible I/O minimize the number of components. In addition, the clock generators reduce board space and provide a cost-efficient solution. Also, Its low jitter improves overall system BER performance while its low power enables high-density designs.

The CDCM61004 family is available now in volume production in a QFN-32 package. The CDCM61004 has four LVPECL/LVDS or eight LVCMOS outputs and is priced at $8.15. The CDCM61002 has two LVPECL/LVDS or four LVCMOS outputs and is priced at $6.25. The CDCM61001 has one LVPECL/LVDS or two LVCMOS outputs and is priced at $5.25. All pricing is in quantities of 100 units.

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