Datasheet

AD7949 Data Sheet
Rev. D | Page 2 of 32
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 3
Specifications ..................................................................................... 4
Timing Specifications .................................................................. 6
Absolute Maximum Ratings ............................................................ 8
ESD Caution .................................................................................. 8
Pin Configuration and Function Descriptions ............................. 9
Typical Performance Characteristics ........................................... 10
Terminology .................................................................................... 13
Theory of Operation ...................................................................... 14
Overview ...................................................................................... 14
Converter Operation .................................................................. 14
Transfer Functions...................................................................... 15
Typical Connection Diagrams .................................................. 16
Analog Inputs .............................................................................. 17
Driver Amplifier Choice ............................................................ 19
Voltage Reference Output/Input .............................................. 19
Power Supply ............................................................................... 21
Supplying the ADC from the Reference .................................. 21
Digital Interface .............................................................................. 22
Reading/Writing During Conversion, Fast Hosts .................. 22
Reading/Writing After Conversion, Any Speed Hosts .......... 22
Reading/Writing Spanning Conversion, Any Speed Host .... 23
Configuration Register, CFG .................................................... 23
General Timing Without a Busy Indicator ............................. 25
General Timing with a Busy Indicator .................................... 26
Channel Sequencer .................................................................... 27
Read/Write Spanning Conversion Without a Busy
Indicator ...................................................................................... 28
Read/Write Spanning Conversion with a Busy Indicator ..... 30
Application Hints ........................................................................... 31
Layout .......................................................................................... 31
Evaluating AD7949 Performance ............................................. 31
Outline Dimensions ....................................................................... 32
Ordering Guide .......................................................................... 32