Datasheet

AD9272
Rev. C | Page 2 of 44
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Product Highlights ........................................................................... 3
Specifications ..................................................................................... 4
AC Specifications .......................................................................... 4
Digital Specifications ................................................................... 8
Switching Specifications .............................................................. 9
Absolute Maximum Ratings .......................................................... 11
Thermal Impedance ................................................................... 11
ESD Caution ................................................................................ 11
Pin Configuration and Function Descriptions ........................... 12
Typical Performance Characteristics ........................................... 15
Equivalent Circuits ......................................................................... 19
Theory of Operation ...................................................................... 21
Ultrasound .................................................................................. 21
Channel Overview ..................................................................... 22
Input Overdrive .......................................................................... 25
CW Doppler Operation ............................................................. 25
TGC Operation ........................................................................... 27
ADC ............................................................................................. 31
Clock Input Considerations ...................................................... 31
Serial Port Interface (SPI) .............................................................. 38
Hardware Interface ..................................................................... 38
Memory Map .................................................................................. 40
Reading the Memory Map Table .............................................. 40
Reserved Locations .................................................................... 40
Default Values ............................................................................. 40
Logic Levels ................................................................................. 40
Outline Dimensions ....................................................................... 44
Ordering Guide .......................................................................... 44
REVISION HISTORY
7/09—Rev. B to Rev. C
Changes to Input Overload Protection Section and Figure 43 ....... 25
Changes to Digital Outputs and Timing Section and Changes
to Figure 63 ...................................................................................... 33
Changes to Hardware Interface Section ...................................... 39
6/09—Rev. A to Rev. B
Changes to Product Highlights Section ......................................... 3
Changes to Table 1 ............................................................................ 4
Changes to Absolute Maximum Ratings Table ........................... 11
Changes to Figure 22 ...................................................................... 17
Changes to Figure 33 and Figure 34 ............................................. 20
Changes to Low Noise Amplifier (LNA) Section ....................... 22
Changes to Active Impedance Matching Section ....................... 23
Changes to Figure 39 ...................................................................... 23
Changes to LNA Noise Section ..................................................... 24
Changes to Figure 47 ...................................................................... 28
Changes to Figure 48 and Figure 49 ............................................. 29
Changes to CSB Pin Section .......................................................... 36
Changes to Reading the Memory Map Table Section................ 40
4/09—Revision A: Initial Version