Datasheet

AD7986
Rev. B | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Application Diagram ........................................................................ 1
General Description ......................................................................... 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 .................................................................................... 12
Theory of Operation ...................................................................... 13
Circuit Information .................................................................... 13
Converter Operation .................................................................. 13
Conversion Modes of Operation .............................................. 13
Typical Connection Diagram.................................................... 14
Analog Inputs.............................................................................. 15
Driver Amplifier Choice ........................................................... 15
Voltage Reference Input ............................................................ 16
Power Supply ............................................................................... 16
Digital Interface .............................................................................. 17
Data Reading Options ............................................................... 18
CS
Mode, 3-Wire Without Busy Indicator ............................. 19
CS
Mode, 3-Wire with Busy Indicator .................................... 20
CS
Mode, 4-Wire Without Busy Indicator ............................. 21
CS
Mode, 4-Wire with Busy Indicator .................................... 22
Chain Mode Without Busy Indicator ...................................... 23
Chain Mode with Busy Indicator ............................................. 24
Application Hints ........................................................................... 25
Layout .......................................................................................... 25
Evaluating the AD7986 Performance ...................................... 25
Outline Dimensions ....................................................................... 27
Ordering Guide .......................................................................... 27
REVISION HISTORY
3/11—Rev. A to Rev. B
Added Common-Mode Input Range Parameter, Table 2 ........... 3
8/10—Rev. 0 to Rev. A
Changes to Conversion Time: CNV Rising Edge to Data
Available (Turbo Mode/Normal Mode) Parameter, Table 4 ....... 5
Changes to Figure 32 ...................................................................... 22
4/09—Revision 0: Initial Version