AD7940

TABLE OF CONTENTS

Table of Contents .............................................................................. 2

 

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

 

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

 

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

 

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

 

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

 

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

 

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

 

Circuit Information ........................................................................ 11

 

Converter Operation.................................................................. 11

 

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

 

ADC Transfer Function ................................................................. 12

 

Typical Connection Diagram ................................................... 12

 

Modes of Operation ....................................................................... 13

 

Normal Mode.............................................................................. 13

 

Power-Down Mode .................................................................... 14

 

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

 

Serial Interface ................................................................................ 16

 

Microprocessor Interfacing........................................................... 17

 

AD7940 to TMS320C541 .......................................................... 17

 

AD7940 to ADSP-218x.............................................................. 17

 

AD7940 to DSP563xx ................................................................ 18

 

Application Hints ........................................................................... 19

 

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

 

Evaluating the AD7940 Performance ...................................... 19

 

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

 

Ordering Guide .......................................................................... 20

 

REVISION HISTORY

8/11—Rev. 0 to Rev. A

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

Changes to Ordering Guide .......................................................... 20

7/04—Revision 0: Initial Version