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AD7791

Low Power, Buffered 24-Bit Sigma-Delta ADC

Analog Devices 

AD7791

TABLE OF CONTENTS

AD7791—Specifications.................................................................. 3

Timing Characteristics..................................................................... 5

Absolute Maximum Ratings............................................................ 7

Pin Configuration and Function Descriptions............................. 8

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

On-Chip Registers .......................................................................... 10

Communications Register

(RS1, RS0 = 0, 0) ......................................................................... 10

Status Register

(RS1, RS0 = 0, 0; Power-on/Reset = 0x8C).............................. 11

Mode Register

(RS1, RS0 = 0, 1; Power-on/Reset = 0x02)............................... 11

Filter Register

(RS1, RS0 = 1, 0; Power-on/Reset = 0x04)............................... 12

Data Register

(RS1, RS0 = 1, 1; Power-on/Reset = 0x000000) ...................... 13

REVISION HISTORY

Revision 0: Initial Version

ADC Circuit Information.............................................................. 14

Overview ..................................................................................... 14

Noise Performance ..................................................................... 14

Reduced Current Modes ........................................................... 14

Digital Interface .......................................................................... 15

Single Conversion Mode ....................................................... 16

Continuous Conversion Mode............................................. 16

Continuous Read Mode ........................................................ 17

Circuit Description......................................................................... 18

Analog Input Channel ............................................................... 18

Bipolar/Unipolar Configuration .............................................. 18

Data Output Coding .................................................................. 18

Reference Input........................................................................... 18

VDD Monitor ................................................................................ 19

Grounding and Layout .............................................................. 19

Outline Dimensions ....................................................................... 20

Rev. 0 | Page 2 of 20

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