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LMX2531LQ1700E Datasheet

  • LMX2531LQ1700E

  • PLLatinum High Performance Frequency Synthesizer System with...

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  • NSC

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LMX2531 High Performance Frequency Synthesizer System with Integrated VCO
October 2005
LMX2531
PLLatinum
鈩?/div>
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 adjust-
able. 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 perfor-
mance. When combined with a high quality reference oscil-
lator, the LMX2531 generates very stable, low noise local
oscillator signals for up and down conversion in wireless
communication devices. The LMX2531 is a monolithic inte-
grated circuit, fabricated in an advanced BiCMOS 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 Lead-
frame Package (LLP).
Features
Multiple Frequency Options Available
鈥?See Selection Guide Below
鈥?Frequencies from: 765 MHz - 2790 MHz
PLL Features
鈥?Fractional-N Delta Sigma Modulator Order
programmable up to 4th order
鈥?FastLock/Cycle Slip Reduction with Timeout Counter
鈥?Partially integrated, adjustable Loop Filter
鈥?Very low phase noise and spurs
VCO Features
鈥?Integrated tank inductor
鈥?Low phase noise
Other Features
鈥?2.8 V to 3.2 V Operation
鈥?Low Power-Down Current
鈥?1.8V MICROWIRE Support
鈥?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,
CDMA1xRTT)
n
Wireless LAN
n
Broadband Wireless Access
n
Satellite Communications
n
Wireless Radio
n
Automotive
n
CATV Equipment
n
Instrumentation and Test Equipment
n
RFID Readers
LMX2531LQ2265E 1089 - 1200 MHz 2178 - 2400 MHz
LMX2531LQ2570E 1168 - 1395 MHz 2336 - 2790 MHz
PLLatinum
鈩?/div>
is a trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS201011
www.national.com

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