7291D Pentek Dual Programmable Multifrequency Clock Synthesizer

The Pentek 7291/7291D/7391 Series Programmable Multifrequency Clock Synthesizers generate up to (16) synthesized clock signals suitable for driving A/D and D/A converters in high-performance real-time data acquisition and software radio systems. The clocks offer exceptionally low phase noise and jitter to preserve the signal quality of the data converters. The Pentek 7291 and 7391 generate eight clocks while the Pentek 7291D generates sixteen.

The Pentek 7291/7291D/7391 Series Programmable Multifrequency Clock Synthesizers use the Texas Instruments CDC7005 clock synthesizer and jitter cleaner devices. Each CDC7005 is paired with a dedicated VCXO (Voltage Controlled Crystal Oscillator) to provide the base frequency for the clock synthesizer. Each of the VCXOs can be independently programmed to a desired frequency between 50 and 700 MHz with 32-bit tuning resolution.

The CDC7005 can output the programmed frequency of its associated VCXO, or generate submultiples using divisors of 2, 4, 8 or 16. The CDC7005's can output up to five frequencies each. These models can be programmed to route any of these (20) or (40) frequencies to the board's output drivers.

The CDC7005 includes phase-locking circuitry that locks the frequency of its associated VCXO to an input reference clock. This reference is a 5 to 100 MHz signal supplied to a front panel SMC connector.

(8) or (16) front panel SMC connectors supply synthesized clock outputs driven from the five or ten clock output drivers. This supports a single identical clock to all outputs or up to (16) different clocks to various outputs.

With independently programmable VCXOs and each CDC7005 capable of providing up to five different submultiple clocks, a wide range of clock configurations is possible. In systems where more than ten different clock outputs are required simultaneously, multiple Pentek 7291D's can be used and phase-locked with a 5 to 100 MHz system reference.