AD8331/AD8332
TABLE OF CONTENTS
REVISION HISTORY..................................................................2
Rev. C | Page 2 of 32
AD8331, AD8332—Specifications..................................................3
Absolute Maximum Ratings............................................................6
ESD CAUTION............................................................................6
AD8331, AD8332—Typical Performance Characteristics..........7
Test Circuits.....................................................................................15
Theory of Operation......................................................................17
Overview......................................................................................17
Low Noise Amplifier (LNA)......................................................17
Variable Gain Amplifier.............................................................19
Postamplifier...............................................................................21
Applications.....................................................................................22
LNA – External Components................................................... 22
Driving ADCs............................................................................. 24
Overload...................................................................................... 24
Optional Input Overload Protection....................................... 25
Layout, Grounding, And Bypassing......................................... 25
Multiple Input Matching........................................................... 25
Disabling the LNA...................................................................... 25
Measurement Considerations................................................... 26
Ultrasound TGC Application................................................... 26
Pin Configuration and Function Descriptions........................... 30
AD8331........................................................................................ 30
AD8332........................................................................................ 31
Outline Dimensions....................................................................... 32
Ordering Guide .......................................................................... 32
REVISION HISTORY
Revision C
11/03—Data Sheet Changed from REV. B to REV. C
Addition of New Part...........................................................Universal
Changes to Figures ...............................................................Universal
Updated Outline Dimensions..........................................................32
5/03—Data Sheet Changed from REV. A to REV. B
Edits to Ordering Guide....................................................................32
Edits to Ultrasound TGC Application section................................25
Added Figure 71, Figure 72, and Figure 73......................................26
Updated Outline Dimensions............................................................31
2/03—Data Sheet Changed from REV. 0 to REV. A
Edits to Ordering Guide.....................................................................32