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LMX2531_07 Datasheet

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LMX2531 High Performance Frequency Synthesizer System with Integrated VCO
January 2007
LMX2531
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 accomdate different fre-
quency 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).
Features
鈻?/div>
Multiple Frequency Options Available
鈥?/div>
See Selection Guide Below
鈥?/div>
Frequencies from: 765 MHz - 2790 MHz
鈻?/div>
PLL Features
鈥?/div>
Fractional-N Delta Sigma Modulator Order
programmable up to 4th order
鈥?/div>
FastLock/Cycle Slip Reduction with Timeout Counter
鈥?/div>
Partially integrated, adjustable Loop Filter
鈥?/div>
Very low phase noise and spurs
鈻?/div>
VCO Features
鈥?/div>
Integrated tank inductor
鈥?/div>
Low phase noise
鈻?/div>
Other Features
鈥?/div>
2.8 V to 3.2 V Operation
鈥?/div>
Low Power-Down Current
鈥?/div>
1.8V MICROWIRE Support
鈥?/div>
Package: 36 Lead LLP
Part
Low Band
High Band
LMX2531LQ1570E
LMX2531LQ1650E
LMX2531LQ1700E
LMX2531LQ1742
LMX2531LQ1778E
LMX2531LQ1910E
LMX2531LQ2080E
765 - 818 MHz
795 - 850 MHz
831 - 885 MHz
880 - 933 MHz
863 - 920 MHz
917 - 1014 MHz
952 - 1137 MHz
1530 - 1636 MHz
1590 - 1700 MHz
1662 - 1770 MHz
1760 - 1866 MHz
1726 - 1840 MHz
1834 - 2028 MHz
1904 - 2274 MHz
Target Applications
鈻?/div>
3G Cellular Base Stations (WCDMA, TD-
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
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
LMX2531LQ2265E 1089 - 1200 MHz 2178 - 2400 MHz
LMX2531LQ2570E 1168 - 1395 MHz 2336 - 2790 MHz
漏 2007 National Semiconductor Corporation
201011
www.national.com

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