Features Multiple Frequency Options Available See Selection Guide Below Frequencies from: 553 MHz - 3132 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 1.8 V MICROWIRE Support Package: 36 Lead LLP Part Low Band High Band LMX2531LQ1146E 553 - 592 MHz 1106 - 1184 MHz LMX2531LQ1226E 592 - 634 MHz 1184 - 1268 MHz LMX2531LQ1312E 634 - 680 MHz 1268 - 1360 MHz LMX2531LQ1415E 680 - 735 MHz 1360 - 1470 MHz LMX2531LQ1515E 725 - 790 MHz 1450 - 1580 MHz 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 LMX2531LQ2820E 1355 - 1462 MHz 2710 - 2925 MHz LMX2531LQ3010E 1455 - 1566 MHz 2910 - 3132 MHz 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 accommodate 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).

LMX2531LQ1742 WEBENCH® Design/Analyze/Build It Custom Design Options (Advanced Options) Min Output Freq MHz >= 1760 help Max Output Freq MHz <= 1866 help Channel Spacing KHz > 0 help Crystal Freq MHz > 0 help Max Supply V > 0 help What is WEBENCH® MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

	Block Diagram *click for larger image

Datasheet

Title		Size	Date	Other Language
	LMX2531 High Performance Frequency Synthesizer System with Integrated VCO	731 Kbytes	23-Jun-09	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1558: Application Note 1558 Clocking High-Speed A/D Converters	659 Kbytes	17-Mar-07	日本語 中文

More Application Notes

Title		Size	Date	Other Language
	AN-1879: Application Note 1879 Fractional N Frequency Synthesis	511 Kbytes	10-Dec-08
	AN-1865: Application Note 1865 Frequency Synthesis and Planning for PLL Architectures	151 Kbytes	6-Feb-09

Design Tools

Title	Size	Date
LMX2531LQ1742 Evaluation Board Instructions	936 Kbytes	28-Apr-2006

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMX2531LQ1742	BICMOS8	2	14113	142	0	1677500	3	475995205
LMX2531LQX1742	BICMOS8	2	14113	142	0	1677500	3	475995205

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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