Datasheet
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