LMX2531_14 Datasheet, PDF (1/48 Pages) Texas Instruments – High-Performance Frequency Synthesizer System

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LMX2531
SNAS252S – OCTOBER 2005 – REVISED DECEMBER 2014
LMX2531 High-Performance Frequency Synthesizer System With Integrated VCO
1 Features
•1 Multiple Frequency Options Available
– See Device Information Table
– Frequencies From: 553 MHz to 3132 MHz
• PLL Features
– Fractional-N Delta-Sigma Modulator Order
Programmable up to Fourth 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 Operating Current
– Low Power-Down Current
– 1.8-V MICROWIRE Support
– 36-Pin 6-mm × 6-mm × 0.8-mm WQFN
Package
2 Applications
• Cellular Base Stations
• Wireless LANs
• Broadband Wireless Access
• Satellite Communications
• Wireless Radios
• Automotive
• CATV Equipment
• Instrumentation and Test Equipment
• RFID Readers
• Data Converter Clocking
3 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 adjustable. Ultra-low noise and
high-precision LDOs are integrated for the PLL and
VCO, which yield higher supply-noise immunity and
more consistent performance. When combined with a
high-quality reference oscillator, the LMX2531 device
generates very stable, low-noise local-oscillator
signals for up and down conversion in wireless
communication devices. The LMX2531 device is a
monolithic integrated circuit, fabricated in an
advanced BiCMOS process. Several different
versions of this product accommodate different
frequency bands.
Device Information⁽¹⁾
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
LMX2531LQ1500E 749.5 — 755 MHz 1499 — 1510 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
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
Vtune
VregVCO
VrefVCO
Fout
OSCin
OSCin*
DATA
CLK
LE
CE
VCO
VREG
1/2
MUX
Prescaler
N
Divider
Comp
R
Divider
Serial Interface
Control
Charge
Pump
CPout
1
Fast
Lock
FLout
Ftest/ LD
DIG
VREG
PLL
VREG1
PLL
VREG2
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.