AD7864

Rev. D | 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

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

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

Pin Configuration and Function Descriptions............................. 7

Terminology ...................................................................................... 9

Theory of Operation ...................................................................... 11

Converter Details........................................................................ 11

Circuit Description......................................................................... 13

Analog Input ............................................................................... 13

Selecting a Conversion Sequence ................................................. 15

Timing and Control ................................................................... 15

Using an External Clock............................................................ 17

Standby Mode Operation.......................................................... 18

Accessing the Output Data Registers....................................... 18

Offset and Full-Scale Adjustment ................................................ 20

Positive Full-Scale Adjust .......................................................... 20

Negative Full-Scale Adjust......................................................... 20

Dynamic Specifications ................................................................. 21

Signal-to-Noise Ratio (SNR)..................................................... 21

Effective Number of Bits ........................................................... 21

Intermodulation Distortion ...................................................... 21

AC Linearity Plots ...................................................................... 22

Measuring Aperture Jitter.......................................................... 22

Microprocessor Interfacing........................................................... 24

AD7864 to ADSP-2100/ADSP-2101/ADSP-2102 Interface . 24

AD7864 to TMS320C5x Interface............................................ 24

AD7864 to MC68HC000 Interface .......................................... 24

Vector Motor Control ................................................................ 25

Multiple AD7864s in A System ................................................. 26

Outline Dimensions ....................................................................... 27

Ordering Guide .......................................................................... 27

REVISION HISTORY

2/09—Rev. C to Rev. D

2/09—Rev. B to Rev. C

Updated Format..................................................................Universal

Changes to Figure 15...................................................................... 20

Changes to AD7864 to MC68HC000 Interface Section ............ 24

Changes to Figure 25...................................................................... 24

Updated Outline Dimensions ....................................................... 29

Changes to Ordering Guide .......................................................... 29

3/04—Rev. A to Rev. B.

Changes to Specifications and to Footnote 4.................................2

Changes to Timing Characteristics Footnote 1.............................4

Addition to Absolute Maximum Ratings .......................................5

Changes to Ordering Guide .............................................................5

Changes to Figure 7.........................................................................11

Changes to Figure 11...................................................................... 13

Updated Outline Dimensions....................................................... 19

Added Revision History ................................................................ 20

Updated Publication Code ............................................................ 20