AD7734

TABLE OF CONTENTS

AD7734—Specifications.................................................................. 3

Timing Specifications....................................................................... 6

Absolute Maximum Ratings............................................................ 8

Typical Performance Characteristics ............................................. 9

Output Noise and Resolution Specification................................ 10

Chopping Enabled...................................................................... 10

Chopping Disabled..................................................................... 11

Pin Configurations and Functional Descriptions ...................... 12

Register Description....................................................................... 14

Register Access............................................................................ 15

Communications Register......................................................... 15

I/O Port Register......................................................................... 16

Revision Register ........................................................................ 16

Test Register ................................................................................ 16

ADC Status Register................................................................... 17

Checksum Register..................................................................... 17

ADC Zero-Scale Calibration Register ..................................... 17

ADC Full-Scale Register............................................................ 17

Channel Data Registers ............................................................. 17

Channel Zero-Scale Calibration Registers .............................. 18

Channel Full-Scale Calibration Registers................................ 18

Channel Status Registers ........................................................... 18

Channel Setup Registers ............................................................ 19

Channel Conversion Time Registers ....................................... 19

Mode Register ............................................................................. 20

Digital Interface Description ........................................................ 22

Hardware ..................................................................................... 22

Reset ............................................................................................. 23

Access the AD7734 Registers.................................................... 23

Single Conversion and Reading Data ...................................... 23

Dump Mode................................................................................ 24

Continuous Conversion Mode ................................................. 24

Continuous Read (Continuous Conversion) Mode .............. 25

Circuit Description......................................................................... 26

Analog Front End....................................................................... 26

Analog Input’s Extended Voltage Range ................................. 27

Chopping ..................................................................................... 27

Multiplexer, Conversion, and Data Output Timing............... 28

Sigma-Delta ADC....................................................................... 28

Frequency Response .................................................................. 29

Voltage Reference Inputs........................................................... 29

Reference Detect......................................................................... 29

I/O Port........................................................................................ 30

Calibration................................................................................... 30

ADC Zero-Scale Self-Calibration ............................................ 30

Per Channel System Calibration .............................................. 30

Outline Dimensions ....................................................................... 32

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