AD7940

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TABLE OF CONTENTS

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

6/04—Revision 0: Initial Version