AD7822/AD7825/AD7829

Rev. C | Page 2 of 28

TABLE OF CONTENTS

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

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

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

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

Product Highlights ....................................................................... 1

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

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

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

Timing Diagram ........................................................................... 5

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configurations and Function Descriptions ........................... 7

Terminology ...................................................................................... 8

Circuit Information ........................................................................ 10

Circuit Description..................................................................... 10

Typical Connection Diagram ................................................... 10

ADC Transfer Function............................................................. 11

Analog Input ............................................................................... 11

Power-Up Times......................................................................... 14

Power vs. Throughput................................................................ 15

Operating Modes........................................................................ 15

Parallel Interface......................................................................... 17

Microprocessor Interfacing........................................................... 18

AD7822/AD7825/AD7829 to 8051 ......................................... 18

AD7822/AD7825/AD7829 to PIC16C6x/PIC16C7x................ 18

AD7822/AD7825/AD7829 to ADSP-21xx ............................. 18

Interfacing Multiplexer Address Inputs .................................. 18

AD7822 Standalone Operation ................................................ 19

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

Ordering Guide .......................................................................... 25

REVISION HISTORY

8/06—Rev. B to Rev. C

Changes to General Description .................................................... 1

Changes to Table 1............................................................................ 3

Changes to Typical Connection Diagram Section ..................... 10

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

Changes to Ordering Guide .......................................................... 25

10/01—Rev. A to Rev. B

Changes to Power Requirements.................................................... 3

Changes to Pin Function Description ........................................... 5

Changes to Circuit Description ...................................................... 7

Changes to Typical Connection Diagram Section........................7

Changes to Analog Input Section....................................................8

Changes to Analog Input Selection Section...................................9

Changes to Power-Up Times Section .......................................... 10

Changes to Power vs. Throughput Section ................................. 11

Added AD7822 Stand-Alone Operation section ....................... 15

12/99—Rev. 0 to Rev. A