Datasheet

AD7490 Data Sheet
Rev. D | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Specifications .................................................................. 5
Absolute Maximum Ratings ............................................................ 6
ESD Caution .................................................................................. 6
Pin Configurations and Function Descriptions ........................... 7
Typical Performance Characteristics ............................................. 8
Terminology .................................................................................... 10
Internal Register Structure ............................................................ 12
Control Register .......................................................................... 12
Shadow Register ......................................................................... 14
Theory of Operation ...................................................................... 16
Circuit Information .................................................................... 16
Converter Operation .................................................................. 16
ADC Transfer Function ............................................................. 17
Typical Connection Diagram ................................................... 18
Modes of Operation ................................................................... 19
Serial Interface ............................................................................ 22
Power vs. Throughput Rate ....................................................... 23
Microprocessor Interfacing ....................................................... 24
Application Hints ....................................................................... 25
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 27
REVISION HISTORY
12/12—Rev. C to Rev. D
Changes to Figure 4 and Table 4 ............................................................. 7
Updated Outline Dimensions (Changed CP-32-2 to CP-32-7) ..... 26
Changes to Ordering Guide ........................................................... 27
6/09—Rev. B to Re v. C
Change to I
DD
Auto Standby Mode Parameter, Table 1 ............... 4
5/08—Rev. A to Rev. B
Updated Format .................................................................. Universal
Changes to Table 1 ............................................................................ 3
Changes to Figure 12 and Figure 13 ............................................. 14
Changes to Figure 14 ...................................................................... 15
Changes to Reference Section ....................................................... 19
Updated Outline Dimensions ....................................................... 26
Changes to Ordering Guide .......................................................... 27
10/02—Rev. 0 to Rev. A
Addition to General Description..................................................... 1
Changes to Timing Specification Notes ......................................... 4
Change to Absolute Maximum Ratings ......................................... 5
Addition to Ordering Guide ............................................................ 5
Changes to Typical Performance Characteristics .......................... 8
Added new Figure 9 .......................................................................... 8
Changes to Figure 12 and Figure 14............................................. 11
Changes to Figure 20 ...................................................................... 13
Changes to Figure 20 to Figure 26 ................................................ 14
Addition to Analog Input section ................................................ 14
Change to Figure 29 caption ......................................................... 18
Change to Figure 30 to Figure 32 ................................................. 18
Added Application Hints section ................................................. 20
1/02—Revision 0: Initial Version