ADA4940-1/ADA4940-2

Data Sheet

Rev. E | Page 2 of 30

TABLE OF CONTENTS

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

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

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

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

Revision History ............................................................................... 3

Specifications..................................................................................... 4

VS = 5 V.......................................................................................... 4

VS = 3 V.......................................................................................... 6

Absolute Maximum Ratings............................................................ 8

Thermal Resistance ...................................................................... 8

Maximum Power Dissipation ..................................................... 8

ESD Caution.................................................................................. 8

Pin Configurations and Function Descriptions ........................... 9

Typical Performance Characteristics ........................................... 11

Test Circuits..................................................................................... 20

Terminology .................................................................................... 21

Definition of Terms.................................................................... 21

Theory of Operation ...................................................................... 22

Applications Information .............................................................. 23

Analyzing an Application Circuit ............................................ 23

Setting the Closed-Loop Gain .................................................. 23

Estimating the Output Noise Voltage ...................................... 23

Impact of Mismatches in the Feedback Networks................. 24

Calculating the Input Impedance of an Application Circuit 24

Input Common-Mode Voltage Range ..................................... 25

Input and Output Capacitive AC Coupling............................ 26

Setting the Output Common-Mode Voltage .......................... 26

DISABLE Pin .............................................................................. 26

Driving a Capacitive Load......................................................... 26

Driving a High Precision ADC ................................................ 27

Layout, Grounding, and Bypassing.............................................. 28

ADA4940-1 LFCSP Example.................................................... 28

Outline Dimensions ....................................................................... 29

Ordering Guide .......................................................................... 30