LMX2487E Description
The LMX2487E 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.
LMX2487E Key Features
- RF PLL: 16/17/20/21 or 32/33/36/37
- IF PLL: 8/9 or 16/17 Advanced Delta Sigma Fractional pensation
- 12 bit or 22 bit selectable fractional modulus
- Up to 4th order programmable delta-sigma modulator Features for Improved Lock Times and Programming
- Fastlock / Cycle slip reduction
- Integrated time-out counter
- Single word write to change frequencies with Fastlock Wide Operating Range
- LMX2487E RF PLL: 3.0 GHz to 7.5 GHz Useful Features
- Digital lock detect output
- Hardware and software power-down control