AD7927

Data Sheet

Rev. D | Page 2 of 28

TABLE OF CONTENTS

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

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

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

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

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

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

Timing Specifications .................................................................. 5

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

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

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

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

Typical Performance Characteristics ........................................... 10

Control Register.............................................................................. 12

Sequencer Operation...................................................................... 13

Shadow Register.............................................................................. 14

Circuit Information.................................................................... 15

Converter Operation.................................................................. 15

Analog Input ............................................................................... 15

ADC Transfer Function............................................................. 16

Handling Bipolar Input Signals ................................................ 16

Typical Connection Diagram........................................................ 17

Analog Input Selection .............................................................. 17

Digital Inputs .............................................................................. 17

VDRIVE............................................................................................ 18

The Reference ............................................................................. 18

Modes of Operation ....................................................................... 19

Normal Mode (PM1 = PM0 = 1) ............................................. 19

Full Shutdown (PM1 = 1, PM0 = 0) ........................................ 19

Auto Shutdown (PM1 = 0, PM0 = 1)....................................... 20

Powering Up the AD7927 ......................................................... 21

Power vs. Throughput Rate....................................................... 21

Serial Interface ................................................................................ 22

Writing Between Conversions .................................................. 22

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

AD7927 to TMS320C541 .......................................................... 24

AD7927 to ADSP-21xx.............................................................. 24

AD7927 to DSP563xx ................................................................ 25

Application Hints ........................................................................... 26

Grounding and Layout .............................................................. 26

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

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

Automotive Products ................................................................. 27

REVISION HISTORY

6/13—Rev. C to Rev. D

Deleted Evaluating the AD7927 Performance Section.............. 26

Changes to Ordering Guide .......................................................... 27

12/11—Rev. B to Rev. C

Changes to Features Section............................................................ 1

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

Changes to Table 3............................................................................ 6

Changes to Ordering Guide, Added Automotive Products

Section.............................................................................................. 27

12/08—Rev. A to Rev. B

Changes to ESD Parameter, Table 3 ................................................6

Changes to Ordering Guide .......................................................... 27

1/07—Rev. 0 to Rev. A

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

Updated Layout .................................................................................8

Updated Layout .............................................................................. 10

Changes to Figure 12 Caption ...................................................... 14

Changes to Figure 13 Caption ...................................................... 15

Changes to Ordering Guide .......................................................... 27

1/03—Revision 0: Initial Version