Datasheet

AD7938-6 Data Sheet
Rev. C | Page 2 of 32
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 Configuration and Function Descriptions ............................. 7
Typical Performance Characteristics ............................................. 9
Terminology .................................................................................... 11
On-Chip Registers .......................................................................... 13
Control Register .......................................................................... 13
Sequencer Operation ................................................................. 14
Shadow Register .......................................................................... 14
Circuit Information ........................................................................ 16
Converter Operation .................................................................. 16
ADC Transfer Function ............................................................. 16
Typical Connection Diagram ................................................... 17
Analog Input Structure .............................................................. 17
Analog Inputs ............................................................................. 18
Analog Input Selection .............................................................. 20
Reference ..................................................................................... 21
Parallel Interface ......................................................................... 23
Power Modes of Operation ....................................................... 26
Power vs. Throughput Rate ....................................................... 27
Microprocessor Interfacing ....................................................... 27
Application Hints ........................................................................... 29
Grounding and Layout .............................................................. 29
PCB Design Guidelines for Chip Scale Package .................... 29
Evaluating the AD7938-6 Performance .................................. 29
Outline Dimensions ....................................................................... 30
Ordering Guide .......................................................................... 31
REVISION HISTORY
10/11—Rev. B to Rev. C
Change to Features Section ............................................................. 1
10/11—Rev. A to Rev. B
Changes to Table 2 ............................................................................ 3
Changes to Figure 2 and Table 5 ..................................................... 7
Added Exposed Pad Notation to Outline Dimensions ............. 30
Changes to Ordering Guide .......................................................... 31
2/07—Rev. 0 to Rev. A
Changes to Specifications ................................................................ 3
Changes to Figure 13 ...................................................................... 10
Changes to Sequencer Operation Section ................................... 14
Changes to Analog Inputs Section ............................................... 18
Updated Outline Dimensions ....................................................... 30
10/04—Revision 0: Initial Version