Datasheet

ADA4940-1/ADA4940-2 Data Sheet
Rev. C | Page 2 of 32
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagrams ............................................................. 1
Revision History ............................................................................... 3
Specifications ..................................................................................... 4
V
S
= 5 V .......................................................................................... 4
V
S
= 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