Datasheet

AD7699 Data Sheet
Rev. B | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block 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 ............................................. 8
Terminology .................................................................................... 12
Theory of Operation ...................................................................... 13
Overvie w ...................................................................................... 13
Converter Operation .................................................................. 13
Transfer Functions...................................................................... 14
Typical Connection Diagrams .................................................. 15
Analog Inputs .............................................................................. 16
Driver Amplifier Choice ............................................................ 18
Voltage Reference Output/Input .............................................. 18
Power Supply ............................................................................... 19
Supplying the ADC from the Reference .................................. 19
Digital Interface .............................................................................. 20
Reading/Writing During Conversion, Fast Hosts .................. 20
Reading/Writing During Acquisition, Any Speed Hosts ...... 20
Reading/Writing Spanning Conversion, Any Speed Host .... 20
Configuration Register, CFG .................................................... 20
General Timing Without a Busy Indicator ............................. 22
Read/Write Spanning Conversion Without a Busy
Indicator ...................................................................................... 23

General Timing With a Busy Indicator ................................... 24
Read/Write Spanning Conversion with a Busy Indicator ..... 25
Application Hints ........................................................................... 26
Layout .......................................................................................... 26
Evaluating AD7699 Performance ............................................. 26
Outline Dimensions ....................................................................... 27
Ordering Guide .......................................................................... 27
REVISION HISTORY
3/12—Rev. A to Rev. B
Changes to Figure 28 ...................................................................... 15
Changes to Internal Reference/Temperature Sensor and External
Reference and Internal Buffer Sections ....................................... 18
Changes to Bits[5:3] Function, Table 8 ........................................ 21
Updated Outline Dimensions ....................................................... 27
9/11—Rev. 0 to Rev. A
Changed Internal Reference/Temperature Sensor Section to
Internal Reference Section ............................................................ 18
Changes to Internal Reference Section, External Reference Section
and Internal Buffer Section, and External Reference Section .. 18
Changes to Table 8 .......................................................................... 21
10/08—Revision 0: Initial Version