ADS4249
SBAS534E – JULY 2011 – REVISED JANUARY 2016
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Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 ADS424x, ADS422x Family Comparison ............. 4
6 Pin Configuration and Functions ......................... 5
7 Specifications....................................................... 10
7.1 Absolute Maximum Ratings .................................... 10
7.2 ESD Ratings............................................................ 10
7.3 Recommended Operating Conditions..................... 11
7.4 Thermal Information ................................................ 11
7.5 Electrical Characteristics: ADS4249 (250 MSPS)... 12
7.6 Electrical Characteristics: General .......................... 13
7.7 Digital Characteristics ............................................. 14
7.8 LVDS and CMOS Modes Timing Requirements..... 15
7.9 LVDS Timings at Lower Sampling Frequencies ..... 16
7.10 CMOS Timings at Lower Sampling Frequencies .. 16
7.11 Serial Interface Timing Characteristics ................. 16
7.12 Reset Timing (Only when Serial Interface is
Used)........................................................................ 17
7.13 Typical Characteristics .......................................... 21
8 Detailed Description ............................................ 28
8.1 Overview ................................................................. 28
8.2 Functional Block Diagram ....................................... 28
8.3 Feature Description................................................. 29
8.4 Device Functional Modes........................................ 31
8.5 Programming........................................................... 37
8.6 Register Maps ......................................................... 41
9 Application and Implementation ........................ 54
9.1 Application Information............................................ 54
9.2 Typical Application ................................................. 60
10 Power Supply Recommendations ..................... 62
10.1 Sharing DRVDD and AVDD Supplies ................... 62
10.2 Using DC-DC Power Supplies .............................. 62
10.3 Power Supply Bypassing ...................................... 62
11 Layout................................................................... 62
11.1 Layout Guidelines ................................................. 62
11.2 Layout Example .................................................... 63
12 Device and Documentation Support ................. 64
12.1 Device Support...................................................... 64
12.2 Documentation Support ........................................ 65
12.3 Community Resources.......................................... 66
12.4 Trademarks ........................................................... 66
12.5 Electrostatic Discharge Caution ............................ 66
12.6 Glossary ................................................................ 66
13 Mechanical, Packaging, and Orderable
Information ........................................................... 66
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (May 2015) to Revision E
Page
• Changed Pin Functions (LVDS Mode) table to comply with RGC Package (LVDS Mode) pin out diagram ......................... 5
• Changed Pin Functions (CMOS Mode) table to comply with RGC Package (CMOS Mode) pin out diagram ..................... 8
• Changed unit in last row of Clock Input, Input clock amplitude differential parameter to VPP in Recommended
Operating Conditions table ................................................................................................................................................... 11
• Added text reference for Table 5 ......................................................................................................................................... 37
Changes from Revision C (July 2012) to Revision D
Page
• Added Pin Configuration and Functions section, 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 B (September 2011) to Revision C
Page
• Changed footnote 1 in CMOS Timings at Lower Sampling Frequencies............................................................................. 16
• Changed conditions for ADS4249 Typical Characteristics section ...................................................................................... 21
• Changed register D5h bit names of bits D7, D4, D3, and D0 in Table 10 ........................................................................... 41
• Changed register address D8 to DB in Table 10 ................................................................................................................. 41
• Changed register address D5h to match change in Table 10.............................................................................................. 53
• Changed register address DB to match change in Table 10 ............................................................................................... 53
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