LMX2581_14 Datasheet, PDF (2/56 Pages) Texas Instruments – Wideband Frequency Synthesizer

LMX2581
SNAS601G – AUGUST 2012 – REVISED SEPTEMBER 2014
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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 ......................... 4
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ..................................... 6
7.2 Handling Ratings....................................................... 6
7.3 Recommended Operating Conditions....................... 6
7.4 Thermal Information .................................................. 6
7.5 Electrical Characteristics........................................... 7
7.6 Timing Requirements, MICROWIRE Timing............. 9
7.7 Typical Characteristics ............................................ 10
8 Detailed Description ............................................ 12
8.1 Overview ................................................................. 12
8.2 Functional Block Diagram ....................................... 12
8.3 Feature Description................................................. 13
8.4 Device Functional Modes........................................ 26
8.5 Programming........................................................... 27
8.6 Register Maps ......................................................... 29
9 Application and Implementation ........................ 43
9.1 Application Information............................................ 43
9.2 Typical Applications ................................................ 43
9.3 Do's and Don'ts ....................................................... 47
10 Power Supply Recommendations ..................... 47
10.1 Supply Recommendations .................................... 47
10.2 Regulator Output Pins........................................... 48
11 Layout................................................................... 49
11.1 Layout Guidelines ................................................. 49
11.2 Layout Example .................................................... 49
12 Device and Documentation Support ................. 50
12.1 Device Support .................................................... 50
12.2 Documentation Support ....................................... 50
12.3 Trademarks ........................................................... 50
12.4 Electrostatic Discharge Caution ............................ 50
12.5 Glossary ................................................................ 50
13 Mechanical, Packaging, and Orderable
Information ........................................................... 50
5 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (March 2014) to Revision G
Page
• Added "over operating free-air temperature range (unless otherwise noted)" in Absolute Maximum Ratings and
Recommended Operating Conditions. ................................................................................................................................... 6
• Added footnotes to HBM, CDM, and MM in Handling Ratings table...................................................................................... 6
• Moved explanations of Typical Characteristics plots from plot footnotes to Feature Description section............................ 13
• Moved Impact of Temperature on VCO Phase Noise into Feature Description section. ..................................................... 14
• Added some description of modulator noise floor and Table 4. .......................................................................................... 16
• Changed -89 to -83 in Table 11............................................................................................................................................ 24
• Moved "Triggering Registers" to "Register Maps" section. .................................................................................................. 29
• Changed order of subsections in Application and Implementation section.......................................................................... 43
• Changed -- inverted color scheme of Figure 23, Figure 24, and Figure 25 to enhance readability..................................... 45
• Added links for Device and Documentation Support . Added links to Application Note AN-1879 (SNAA062)
throughout the document...................................................................................................................................................... 50
Changes from Revision E (Novmeber 2013) to Revision F
Page
• Added data sheet structure and organization. Added, updated, or renamed the following sections: Device
Information Table, Application and Implementation; Power Supply Recommendations; Layout; Device and
Documentation Support; Mechanical, Packaging, and Ordering Information......................................................................... 1
• Changed Clarified that typical PLL noise metrics are measured at max charge pump gain. ............................................... 7
• Added Typical Characteristics curves. ................................................................................................................................ 10
• Changed Recommendation for OSC_FREQ bit for input frequencies > 64 MHz ............................................................... 34
• Added Application and Implementation section with schematic........................................................................................... 43
• Added Power Supply Recommendations ............................................................................................................................. 47
• Added Layout ...................................................................................................................................................................... 49
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