LMX2531 System Datasheet

LMX2531 Datasheet PDF, Equivalent


Part Number

LMX2531

Description

High-Performance Frequency Synthesizer System

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LMX2531
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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
MUX
1/2
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.

LMX2531
LMX2531
SNAS252S – OCTOBER 2005 – REVISED DECEMBER 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Simplified Schematic............................................. 1
5 Revision History..................................................... 2
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 6
7.6 MICROWIRE Timing Requirements........................ 13
7.7 Typical Performance Characteristics ...................... 14
8 Detailed Description ............................................ 15
8.1 Overview ................................................................. 15
8.2 Functional Block Diagram ....................................... 15
8.3 Feature Description................................................. 15
8.4 Device Functional Modes........................................ 20
8.5 Programming........................................................... 20
8.6 Register Maps ......................................................... 21
9 Application and Implementation ........................ 33
9.1 Application Information............................................ 33
9.2 Typical Application ................................................. 33
9.3 Do's and Don'ts ....................................................... 35
10 Power Supply Recommendations ..................... 35
11 Layout................................................................... 35
11.1 Layout Guidelines ................................................. 35
11.2 Layout Example .................................................... 36
12 Device and Documentation Support ................. 37
12.1 Device Support...................................................... 37
12.2 Trademarks ........................................................... 37
12.3 Electrostatic Discharge Caution ............................ 37
12.4 Glossary ................................................................ 37
13 Mechanical, Packaging, and Orderable
Information ........................................................... 37
5 Revision History
Changes from Revision R (April 2013) to Revision S
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section .................................................................................................. 1
Changes from Revision Q (February 2013) to Revision R
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 32
2 Submit Documentation Feedback
Product Folder Links: LMX2531
Copyright © 2005–2014, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LMX2531 SNAS252S – OCTOBER 2005 – REVISED DECEMBER 2014 LMX2531 High-Performance Frequency Synthesizer System With Integrated VCO 1 Features •1 Multiple Frequency Options Availa ble – See Device Information Table Frequencies From: 553 MHz to 3132 MHz • PLL Features – Fractional-N Delt a-Sigma Modulator Order Programmable up to Fourth Order – FastLock/Cycle Sli p Reduction with Timeout Counter – Pa rtially Integrated, Adjustable Loop Fil ter – Very Low Phase Noise and Spurs • VCO Features – Integrated Tank In ductor – Low Phase Noise • Other Fe atures – 2.8-V to 3.2-V Operation – Low Operating Current – Low Power-Do wn Current – 1.8-V MICROWIRE Support – 36-Pin 6-mm × 6-mm × 0.8-mm WQFN Package 2 Applications • Cellular Bas e Stations • Wireless LANs • Broadb and Wireless Access • Satellite Commu nications • Wireless Radios • Automotive • CATV Equipment • Instrumentation and Test Equipment • RFID Readers •.
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