ADA4938-1/ADA4938-2

Data Sheet

Rev. B | Page 2 of 26

TABLE OF CONTENTS

Features .............................................................................................. 1

 

Applications....................................................................................... 1

 

General Description ......................................................................... 1

 

Functional Block Diagrams............................................................. 1

 

Revision History ............................................................................... 2

 

Specifications..................................................................................... 3

 

Dual-Supply Operation ............................................................... 3

 

Single-Supply Operation ............................................................. 5

 

Absolute Maximum Ratings............................................................ 7

 

Thermal Resistance ...................................................................... 7

 

ESD Caution.................................................................................. 7

 

Pin Configurations and Function Descriptions ........................... 8

 

Typical Performance Characteristics ............................................. 9

 

Test Circuts ...................................................................................... 17

 

Terminology .................................................................................... 18

 

Theory of Operation ...................................................................... 19

 

Analyzing an Application Circuit ............................................ 19

 

Setting the Closed-Loop Gain .................................................. 19

 

Estimating the Output Noise Voltage ...................................... 19

 

The Impact of Mismatches in the Feedback Networks ......... 20

 

Calculating the Input Impedance of an Application Circuit ..... 20

 

Input Common-Mode Voltage Range in Single-Supply

Applications ................................................................................ 20

 

Terminating a Single-Ended Input .......................................... 21

 

Setting the Output Common-Mode Voltage .......................... 21

 

Layout, Grounding, and Bypassing.............................................. 23

 

High Performance ADC Driving ................................................. 24

 

Outline Dimensions ....................................................................... 25

 

Ordering Guide .......................................................................... 25

 

REVISION HISTORY

6/2016—Rev. A to Rev. B

Changed CP-16-2 to CP-16-21, CP-24-1 to CP-24-10.. Throughout

Changed ADA4938-x to ADA4938-1/ADA4938-2 .. Throughout

Changes to Figure 1 and Figure 2................................................... 1

Changes to Figure 5 and Figure 6................................................... 8

Updated Outline Dimensions ....................................................... 25

Changes to Ordering Guide .......................................................... 25

10/2009—Rev. 0 to Rev. A

Added Settling Time Parameter, Table 1 ....................................... 3

Changes to Linear Output Current Parameter, Table 1............... 3

Added Settling Time Parameter, Table 3 ........................................5

Changes to Linear Output Current Parameter, Table 3................5

Changes to Figure 5 and Figure 6....................................................8

Added EP Row to Table 7 and EP Row to Table 8 ........................8

Changes to Figure 41...................................................................... 14

Added New Figure 53, Renumbered Sequentially ..................... 16

Changes to Table 9.......................................................................... 19

Added Exposed Pad Notation to Outline Dimensions ............. 25

Changes to Ordering Guide .......................................................... 25

11/2007—Revision 0: Initial Version