Monday, October 30, 2006

14-Channel Clock ICs Boast Low Phase

The AD9516 series of clock ICs features low-phase-noise clock generation with 14-channel clock distribution at jitter levels below 1 ps. The devices integrate an integer-N synthesizer, two reference inputs, a voltage-controlled oscillator (VCO), programmable dividers, adjustable delay lines, and 14 clock drivers, including LVPECL, LVDS, and CMOS. This high level of integration eliminates several discrete components, reducing board space and costs by more than 50%, according to Analog Devices. Also, integrating the VCO on-chip greatly reduces the risks associated with the failure of discrete oscillators, improving system reliability.

The clock ICs come in five versions, each supporting a specific frequency range. The AD9516-0 includes a VCO that tunes from 2.60 to 2.95 GHz. The other parts cover lower frequencies, down to the AD9516-4's range of 1.50 to 1.90 GHz. The devices can also be used with an external VCO up to 2.4 GHz. Each unit includes six LVPECL outputs that can operate up to the VCO's maximum rate, as well as four/eight outputs that can be programmed to either LVDS (four outputs max) or CMOS (eight outputs max) levels. In LVDS mode, the outputs operate to 1 GHz, and in CMOS mode they operate to 250 MHz. The devices come in 9- by 9-mm, 64-lead lead-frame chip-scale packages.

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