Datasheet

AD9277
Rev. 0 | Page 2 of 48
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Product Highlights ........................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
General Description ......................................................................... 3
Specifications ..................................................................................... 4 
AC Specifications .......................................................................... 4
Digital Specifications ................................................................... 7
Switching Specifications .............................................................. 8
ADC Timing Diagrams ............................................................... 9
Absolute Maximum Ratings .......................................................... 10
Thermal Impedance ................................................................... 10
ESD Caution ................................................................................ 10
Pin Configuration and Function Descriptions ........................... 11
Typical Performance Characteristics ........................................... 14
TGC Mode ................................................................................... 14
CW Doppler Mode ..................................................................... 17
Equivalent Circuits ......................................................................... 19
Theory of Operation ...................................................................... 21
Ultrasound .................................................................................. 21
Channel Overview ..................................................................... 22
Input Overdrive .......................................................................... 25
CW Doppler Operation ............................................................. 25
TGC Operation ........................................................................... 29
ADC ............................................................................................. 33
Clock Input Considerations ...................................................... 33
Digital Outputs and Timing ..................................................... 35
Serial Port Interface (SPI) .............................................................. 39
Hardware Interface ..................................................................... 40
Memory Map .................................................................................. 41
Reading the Memory Map Table .............................................. 41
Reserved Locations .................................................................... 41
Default Values ............................................................................. 41
Logic Levels ................................................................................. 41
Applications Information .............................................................. 45
Power and Ground Recommendations ................................... 45
Exposed Paddle Thermal Heat Slug Recommendations ...... 45
Outline Dimensions ....................................................................... 46
Ordering Guide .......................................................................... 46
REVISION HISTORY
7/09—Revision 0: Initial Version