LMX2531 Datasheet | National Semiconductor

Description The LMX2531 is a low power, high performance frequency synthesizer system which includes a fully integrated deltasigma 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 bined with a high quality reference oscillator, the LMX2531 generates very stable, low noise local oscillator signals for up and down conversion in wireless munication devices. The LMX2531 is a monolithic integrated circuit, fabricated in an advanced Bi CMOS process. There are actually several different versions of this product, for which the primary difference is frequency range. 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 - Fast Lock/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 LMX2531LQ1570E LMX2531LQ1650E LMX2531LQ1700E LMX2531LQ1778E LMX2531LQ1910E LMX2531LQ2080E Low Band 765 - 818 MHz 795 - 850 MHz 831 - 885 MHz 863 - 920 MHz 917 - 1014 MHz 952 - 1137 MHz High Band 1530 - 1636 MHz 1590 - 1700 MHz 1662 - 1770 MHz 1726 - 1840 MHz 1834 - 2028 MHz 1904 - 2274 MHz Target Applications n 3G Cellular Base Stations (WCDMA, TD-SCDMA,CDMA2000) n 2G Cellular Base Stations (GSM/GPRS, EDGE, CDMA1x RTT) n Wireless LAN n...