ADA4530-1R-EBZ-TIA datasheet(3/51 Pages) AD

Part #	ADA4530-1R-EBZ-TIA

Description	Femtoampere Input Bias Current Electrometer Amplifier

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ADA4530-1

Data Sheet

Rev. A | Page 2 of 50

TABLE OF CONTENTS

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

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

Pin Connection Diagram ................................................................ 1

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

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

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

5 V Nominal Electrical Characteristics ..................................... 3

10 V Nominal Electrical Characteristics ................................... 5

15 V Nominal Electrical Characteristics ................................... 7

Absolute Maximum Ratings............................................................ 9

Thermal Resistance ...................................................................... 9

ESD Caution.................................................................................. 9

Pin Configuration and Function Descriptions........................... 10

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

Main Amplifier, DC Performance............................................ 11

Main Amplifier, AC Performance ............................................ 20

Guard Amplifier ......................................................................... 26

Theory of Operation ...................................................................... 28

ESD Structure.............................................................................. 28

Input Stage................................................................................... 28

Gain Stage.................................................................................... 29

Output Stage................................................................................ 29

Guard Buffer ............................................................................... 29

Applications Information .............................................................. 30

Input Protection.......................................................................... 30

Single-Supply and Rail-to-Rail Output ................................... 30

Capacitive Load Stability ........................................................... 30

EMI Rejection Ratio................................................................... 31

High Impedance Measurements................................................... 32

Input Bias Current...................................................................... 32

Input Resistance.......................................................................... 33

Input Offset Voltage ................................................................... 33

Insulation Resistance ................................................................. 33

Guarding...................................................................................... 34

Dielectric Relaxation.................................................................. 34

Humidity Effects......................................................................... 36

Contamination............................................................................ 37

Cleaning and Handling ............................................................. 38

Solder Paste Selection ................................................................ 38

Current Noise Considerations ...................................................... 39

Layout Guidelines........................................................................... 42

Physical Implementation of Guarding Techniques................ 42

Guard Ring .................................................................................. 42

Guard Plane................................................................................. 42

Via Fence ..................................................................................... 43

Cables and Connectors.............................................................. 43

Electrostatic Interferance .......................................................... 43

Photodiode Interface...................................................................... 44

DC Error Analysis...................................................................... 44

AC Error Analysis ...................................................................... 44

Noise Analysis............................................................................. 45

Design Recommendations ........................................................ 46

Design Example.......................................................................... 46

Power Supply Recommendations................................................. 49

Power Supply Considerations................................................... 49

Outline Dimensions ....................................................................... 50

Ordering Guide .......................................................................... 50

REVISION HISTORY

3/16—Rev. 0 to Rev. A

Changed DNC Pin to IC Pin........................................ Throughout

Changes to Figure 1.......................................................................... 1

Changes to Figure 3 and Table 6................................................... 10

Changes to Figure 29...................................................................... 15

Changes to Theory of Operation Section.................................... 28

Changes to Humidity Effects Section and Figure 112 ............... 36

Added Power Supply Recommendations Section, Power

Supply Considerations Section, Table 16, and Figure 133 to

Figure 135 ........................................................................................ 49

10/15—Revision 0: Initial Version

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