ADAQ7980 datasheet(2/49 Pages) AD

2 / 49 page

ADAQ7980/ADAQ7988

Data Sheet

Rev. 0 | Page 2 of 49

TABLE OF CONTENTS

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

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

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

Functional Block Diagram .............................................................. 1

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

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

Dual-Supply Configuration ........................................................ 3

Single-Supply Configuration ...................................................... 7

Timing Specifications ................................................................ 11

Absolute Maximum Ratings.......................................................... 13

Thermal Data .............................................................................. 13

Thermal Resistance .................................................................... 13

ESD Caution................................................................................ 13

Pin Configuration and Function Descriptions........................... 15

Typical Performance Characteristics ........................................... 17

Terminology .................................................................................... 25

Theory of Operation ...................................................................... 26

Circuit Information.................................................................... 26

Converter Operation.................................................................. 26

Typical Connection Diagram ................................................... 27

ADC Driver Input ...................................................................... 28

Input Protection.......................................................................... 28

Noise Considerations And Signal Settling .............................. 28

PD_AMP Operation .................................................................. 31

Dynamic Power Scaling (DPS) ................................................. 31

Slew Enhancement ..................................................................... 33

Effect of Feedback Resistor on Frequency Response ............ 33

Voltage Reference Input ............................................................ 33

Power Supply............................................................................... 35

LDO Regulator Current-Limit and Thermal Overload

Protection .................................................................................... 36

LDO Regulator Thermal Considerations ............................... 36

Digital Interface.......................................................................... 37

3-Wire CS Mode Without the Busy Indicator........................ 38

3-Wire CS Mode with the Busy Indicator............................... 39

4-Wire CS Mode Without the Busy Indicator........................ 40

4-Wire CS Mode with the Busy Indicator............................... 41

Chain Mode Without the Busy Indicator ............................... 42

Chain Mode with the Busy Indicator ...................................... 43

Application Circuits ....................................................................... 44

Nonunity Gain Configurations ................................................ 45

Inverting Configuration with Level Shift................................ 46

Using the ADAQ7980/ADAQ7988 With Active Filters........ 47

Applications Information .............................................................. 48

Layout .......................................................................................... 48

Evaluating the Performance of the ADAQ7980/ADAQ7988 ... 48

Outline Dimensions ....................................................................... 49

Ordering Guide .......................................................................... 49

REVISION HISTORY

3/2017—Revision 0: Initial Version

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