LMX2541 Synthesizer Datasheet

LMX2541 Datasheet PDF, Equivalent


Part Number

LMX2541

Description

Ultra-Low Noise PLLatinum Frequency Synthesizer

Manufacture

etcTI

Total Page 30 Pages
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LMX2541
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LMX2541
SNOSB31J – JULY 2009 – REVISED DECEMBER 2014
LMX2541 Ultra-Low Noise PLLatinum Frequency Synthesizer With Integrated VCO
1 Features
1 Multiple Frequency Options Available
(See Device Comparison Table)
• Frequencies From 31.6 MHz to 4000 MHz
• Very Low RMS Noise and Spurs
• –225 dBc/Hz Normalized PLL Phase Noise
• Integrated RMS Noise (100 Hz to 20 MHz)
– 2 mRad (100 Hz to 20 MHz) at 2.1 GHz
– 3.5 mRad (100 Hz to 20 MHz) at 3.5 GHz
• Ultra Low-Noise Integrated VCO
• External VCO Option (Internal VCO Bypassed)
• VCO Frequency Divider 1 to 63 (All Values)
• Programmable Output Power
• Up to 104-MHz Phase Detector Frequency
• Integrated Low-Noise LDOs
• Programmable Charge Pump Output
• Partially Integrated Loop Filter
• Digital Frequency Shift Keying (FSK) Modulation
Pin
• Integrated Reference Crystal Oscillator Circuit
• Hardware and Software Power Down
• FastLock Mode and VCO-Based Cycle Slip
Reduction
• Analog and Digital Lock Detect
• 1.6-V Logic Compatibility
2 Applications
• Wireless Infrastructure (UMTS, LTE, WiMax)
• Broadband Wireless
• Wireless Meter Reading
• Test and Measurement
• FM Mobile Radio
space
3 Description
The LMX2541 device is an ultra low-noise frequency
synthesizer which integrates a high-performance
delta-sigma fractional N PLL, a VCO with fully
integrated tank circuit, and an optional frequency
divider. The PLL offers an unprecedented normalized
noise floor of –225 dBc/Hz and can be operated with
up to 104 MHz of phase-detector rate (comparison
frequency) in both integer and fractional modes. The
PLL can also be configured to work with an external
VCO.
The LMX2541 integrates several low-noise, high-
precision LDOs and output driver matching network to
provide higher supply noise immunity and more
consistent performance, while reducing the number of
external components. When combined with a high-
quality reference oscillator, the LMX2541 generates a
very stable, ultra low-noise signal.
The LMX2541 is offered in a family of 6 devices with
varying VCO frequency range from 1990 MHz up to 4
GHz. Using a flexible divider, the LMX2541 can
generate frequencies as low as 31.6 MHz.
The LMX2541 is a monolithic integrated circuit,
fabricated in a proprietary BiCMOS process. Device
programming is facilitated using a three-wire
MICROWIRE interface that can operate down to 1.6
volts. Supply voltage ranges from 3.15 V to 3.45 V.
The LMX2541 is available in a 36-pin 6-mm × 6-mm
× 0.8-mm WQFN package.
Device Information(1)
PART NUMBER
PACKAGE
VCO FREQUENCY
(MHz)
LMX2541SQ2060E WQFN (36)
1990 - 2240
LMX2541SQ2380E WQFN (36)
2200 - 2530
LMX2541SQ2690E WQFN (36)
2490 - 2865
LMX2541SQ3030E WQFN (36)
2810 - 3230
LMX2541SQ3320E WQFN (36)
3130 - 3600
LMX2541SQ3740E WQFN (36)
3480 - 4000
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
System Block Diagram
Dirty Input
Clock
PLL
Clean
Reference
Clock
PLL
Ultra-Clean
Local Oscillator
LMK04000
LMX2541
(Clock Jitter Cleaner)
(RF Synthesizer)
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.

LMX2541
LMX2541
SNOSB31J – JULY 2009 – REVISED DECEMBER 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6
7.2 ESD Ratings.............................................................. 6
7.3 Recommended Operating Conditions....................... 6
7.4 Thermal Information .................................................. 6
7.5 Electrical Characteristics........................................... 7
7.6 Timing Requirements .............................................. 11
7.7 Typical Characteristics ............................................ 12
8 Parameter Measurement Information ................ 23
8.1 Bench Test Setups.................................................. 23
9 Detailed Description ............................................ 25
9.1 Overview ................................................................. 25
9.2 Functional Block Diagrams ..................................... 25
9.3 Feature Description................................................. 26
9.4 Device Functional Modes........................................ 36
9.5 Programming........................................................... 37
9.6 Register Maps ......................................................... 38
10 Application and Implementation........................ 51
10.1 Application Information.......................................... 51
10.2 Typical Application ............................................... 59
11 Power Supply Recommendations ..................... 61
12 Layout................................................................... 62
12.1 Layout Guidelines ................................................. 62
12.2 Layout Example .................................................... 63
13 Device and Documentation Support ................. 64
13.1 Device Support...................................................... 64
13.2 Trademarks ........................................................... 64
13.3 Electrostatic Discharge Caution ............................ 64
13.4 Glossary ................................................................ 64
14 Mechanical, Packaging, and Orderable
Information ........................................................... 64
4 Revision History
Changes from Revision I (February 2013) to Revision J
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 H (February 2013) to Revision I
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 36
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Product Folder Links: LMX2541
Copyright © 2009–2014, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LMX2541 SNOSB31J – JULY 20 09 – REVISED DECEMBER 2014 LMX2541 Ul tra-Low Noise PLLatinum Frequency Synth esizer With Integrated VCO 1 Features •1 Multiple Frequency Options Availab le (See Device Comparison Table) • Fr equencies From 31.6 MHz to 4000 MHz • Very Low RMS Noise and Spurs • –22 5 dBc/Hz Normalized PLL Phase Noise • Integrated RMS Noise (100 Hz to 20 MHz ) – 2 mRad (100 Hz to 20 MHz) at 2.1 GHz – 3.5 mRad (100 Hz to 20 MHz) at 3.5 GHz • Ultra Low-Noise Integrated VCO • External VCO Option (Internal V CO Bypassed) • VCO Frequency Divider 1 to 63 (All Values) • Programmable O utput Power • Up to 104-MHz Phase Det ector Frequency • Integrated Low-Nois e LDOs • Programmable Charge Pump Out put • Partially Integrated Loop Filte r • Digital Frequency Shift Keying (F SK) Modulation Pin • Integrated Refer ence Crystal Oscillator Circuit • Hardware and Software Power Down • FastLock Mode and VCO-Based Cycle .
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