Datasheet

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AD7194 Data Sheet

Rev. A | Page 2 of 56

TABLE OF CONTENTS

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

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

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

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

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

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

Timing Characteristics ................................................................ 7

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

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

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

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

Typical Performance Characteristics ........................................... 12

RMS Noise and Resolution............................................................ 15

Sinc

Chop Disabled ................................................................... 15

Sinc

Chop Disabled ................................................................... 16

Fast Settling ................................................................................. 17

On-Chip Registers .......................................................................... 18

Communications Register ......................................................... 19

Status Register ............................................................................. 20

Mode Register ............................................................................. 21

Configuration Register .............................................................. 24

Data Register ............................................................................... 27

ID Register ................................................................................... 27

GPOCON Register ..................................................................... 27

Offset Register ............................................................................. 28

Full-Scale Register ...................................................................... 28

ADC Circuit Information .............................................................. 29

Overview ...................................................................................... 29

Analog Input Channel ............................................................... 30

Programmable Gain Array (PGA) ........................................... 30

Reference ..................................................................................... 30

Reference Detect ......................................................................... 31

Bipolar/Unipolar Configuration .............................................. 31

Data Output Coding .................................................................. 31

Burnout Currents ....................................................................... 31

Digital Interface .......................................................................... 32

Reset ............................................................................................. 36

System Synchronization ............................................................ 36

Enable Parity ............................................................................... 36

Clock ............................................................................................ 36

Temperature Sensor ................................................................... 36

Logic Outputs ............................................................................. 37

Calibration................................................................................... 37

Digital Filter .................................................................................... 39

Sinc

Filter (Chop Disabled) ..................................................... 39

Sinc

Filter (Chop Disabled) ..................................................... 41

Chop Enabled (Sinc

Filter) ...................................................... 43

Chop Enabled (Sinc

Filter) ...................................................... 45

Fast Settling Mode (Sinc

Filter) ............................................... 46

Fast Settling Mode (Sinc

Filter) ............................................... 48

Fast Settling Mode (Chop Enabled) ......................................... 50

Summary of Filter Options ....................................................... 51

Grounding and Layout .................................................................. 52

Applications Information .............................................................. 53

Flowmeter .................................................................................... 53

Outline Dimensions ....................................................................... 54

Ordering Guide .......................................................................... 54

REVISION HISTORY

3/13—Rev. 0 to Rev. A

Changes to Pin 26, Table 5.............................................................. 11

Changes to Table 21 ......................................................................... 25

Changes to Analog Inputs Section ................................................ 29

Changes to Data Output Coding Section ..................................... 31

10/09—Revision 0: Initial Version