ADA4939-1/ADA4939-2
TABLE OF CONTENTS
Features .............................................................................................. 1
Theory of Operation ...................................................................... 17
Analyzing an Application Circuit ............................................ 17
Setting the Closed-Loop Gain .................................................. 17
Stable for Gains ≥2 ..................................................................... 17
Estimating the Output Noise Voltage...................................... 17
Impact of Mismatches in the Feedback Networks................. 18
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagrams............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
5 V Operation ............................................................................... 3
3.3 V Operation ............................................................................ 5
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
Maximum Power Dissipation ..................................................... 7
ESD Caution.................................................................................. 7
Pin Configurations and Function Descriptions ........................... 8
Typical Performance Characteristics ............................................. 9
Test Circuits ..................................................................................... 15
Operational Description................................................................ 16
Definition of Terms.................................................................... 16
Calculating the Input Impedance for an Application Circuit
....................................................................................................... 19
Input Common-Mode Voltage Range..................................... 21
Input and Output Capacitive AC-Coupling ........................... 21
Minimum RG Value of 50 Ω...................................................... 21
Setting the Output Common-Mode Voltage.......................... 21
Layout, Grounding, and Bypassing.............................................. 22
High Performance ADC Driving ................................................. 23
Outline Dimensions....................................................................... 24
Ordering Guide .......................................................................... 24
REVISION HISTORY
5/08—Revision 0: Initial Version
Rev. 0 | Page 2 of 24