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LMX2487 - High Performance Delta-Sigma Low Power Dual PLLatinum Frequency Synthesizers

General Description

The LMX2487 is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL.

It is fabricated using National Semiconductor’s advanced process.

Key Features

  • Quadruple Modulus Prescalers for Lower Divide Ratios n RF PLL: 16/17/20/21 or 32/33/36/37 n IF PLL: 8/9 or 16/17 Advanced Delta Sigma Fractional Compensation n 12 bit or 22 bit selectable fractional modulus n Up to 4th order programmable delta-sigma modulator Features for Improved Lock Times and Programming n Fastlock / Cycle slip reduction n Integrated time-out counter n Single word write to change frequencies with Fastlock Wide Operating Range n LMX2487 RF PLL: 3.0 GHz to 6.0 GHz Useful Featur.

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Part Number Description
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www.DataSheet4U.com LMX2487 High Performance Delta-Sigma Low Power Dual PLLatinum Frequency Synthesizer February 2006 LMX2487 3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum™ Frequency Synthesizers with 3.0 GHz Integer PLL General Description The LMX2487 is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. It is fabricated using National Semiconductor’s advanced process. With delta-sigma architecture, fractional spurs at lower offset frequencies are pushed to higher frequencies outside the loop bandwidth. The ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order.