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LMX2471

National Semiconductor
Part Number LMX2471
Manufacturer National Semiconductor
Description 3.6 GHz Delta-Sigma Fractional-N PLL
Published Apr 25, 2005
Detailed Description LMX2471 3.6 GHz Delta-Sigma Fractional-N PLL with 1.7 GHz Integer-N PLL November 2003 LMX2471 3.6 GHz Delta-Sigma Frac...
Datasheet PDF File LMX2471 PDF File

LMX2471
LMX2471

Overview
LMX2471 3.
6 GHz Delta-Sigma Fractional-N PLL with 1.
7 GHz Integer-N PLL November 2003 LMX2471 3.
6 GHz Delta-Sigma Fractional-N PLL with 1.
7 GHz Integer-N PLL General Description The LMX2471 is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL.
The device is fabricated using National Semiconductor’s advanced BiCMOS process.
With delta-sigma architecture, fractional spur compensation is achieved with noise shaping capability of the delta-sigma modulator and the inherent low pass filtering of the PLL loop filter.
Fractional spurs at lower frequencies are pushed to higher frequencies outside the loop bandwidth.
Unlike analog compensation, the digital feedback techniques used in the LMX2471 are highly resistant to changes in temperature and variations in wafer processing.
With delta-sigma architecture, the ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order.
The higher the order, th...


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