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High Performance Frequency Synthesizer System with Integrated VCO from the PowerWise® Family
National Semiconductor
Description
The LMX2531 is a low power, high performance frequency synthesizer system which includes a fully integrated delta-sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and also adjustable. Also included are integrated ultra-low noise and high precision LDOs for the PLL and VCO which give higher supply noise immunity and also more consistent performance. When combined with a high quality reference oscillator, the LMX2531 generates very stable, low noise local oscillator signals for up and down conversion in wireless communication devices. The LMX2531 is a monolithic integrated circuit, fabricated in an advanced BiCMOS process. There are several different versions of this product in order to accomdate different frequency bands. Device programming is facilitated using a three-wire MICROWIRE Interface that can operate down to 1.8 volts. Supply voltage range is 2.8 to 3.2 Volts. The LMX2531 is available in a 36 pin 6x6x0.8 mm Lead-Free Leadless Leadframe Package (LLP).
Features
Multiple Frequency Options Available See Selection Guide Below Frequencies from: 765 MHz - 2790 MHz PLL Features Fractional-N Delta Sigma Modulator Order programmable up to 4th order FastLock/Cycle Slip Reduction with Timeout Counter Partially integrated, adjustable Loop Filter Very low phase noise and spurs VCO Features Integrated tank inductor Low phase noise Other Features 2.8 V to 3.2 V Operation Low Power-Down Current 1.8V MICROWIRE Support Package: 36 Lead LLP Part Low Band High Band LMX2531LQ1570E 765 - 818 MHz 1530 - 1636 MHz LMX2531LQ1650E 795 - 850 MHz 1590 - 1700 MHz LMX2531LQ1700E 831 - 885 MHz 1662 - 1770 MHz LMX2531LQ1742 880 - 933 MHz 1760 - 1866 MHz LMX2531LQ1778E 863 - 920 MHz 1726 - 1840 MHz LMX2531LQ1910E 917 - 1014 MHz 1834 - 2028 MHz LMX2531LQ2080E 952 - 1137 MHz 1904 - 2274 MHz LMX2531LQ2265E 1089 - 1200 MHz 2178 - 2400 MHz LMX2531LQ2570E 1168 - 1395 MHz 2336 - 2790 MHz
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