LMX2531 Datasheet, PDF (1/36 Pages) National Semiconductor (TI) – High Performance Frequency Synthesizer System with Integrated VCO

LMX2531
June 23, 2009
High Performance Frequency Synthesizer System with
Integrated VCO
General 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 com-
bined 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 Lead-
frame Package (LLP).
Target Applications
■ ^{3G Cellular Base Stations (WCDMA, TD-}
SCDMA,CDMA2000)
■ ^{2G Cellular Base Stations (GSM/GPRS, EDGE,}
CDMA1xRTT)
■ ^{Wireless LAN}
■ ^{Broadband Wireless Access}
■ ^{Satellite Communications}
■ ^{Wireless Radio}
■ ^Automotive
■ ^{CATV Equipment}
■ ^{Instrumentation and Test Equipment}
■ ^{RFID Readers}
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
© 2009 National Semiconductor Corporation 201011
www.national.com