AD8331/AD8332/AD8334
TABLE OF CONTENTS
Features .............................................................................................. 1
Ultrasound TGC Application ................................................... 34
High Density Quad Layout....................................................... 34
AD8331 Evaluation Board ............................................................ 39
General Description................................................................... 39
User-Supplied Optional Components..................................... 39
Measurement Setup.................................................................... 39
Board Layout............................................................................... 39
AD8331 Evaluation Board Schematics.................................... 40
AD8331 Evaluation Board PCB Layers................................... 42
AD8332 Evaluation Board ............................................................ 43
General Description................................................................... 43
User-Supplied Optional Components..................................... 43
Measurement Setup.................................................................... 43
Board Layout............................................................................... 43
Evaluation Board Schematics ................................................... 44
AD8332 Evaluation Board PCB Layers................................... 46
AD8334 Evaluation Board ............................................................ 47
General Description................................................................... 47
Configuring the Input Impedance........................................... 48
Measurement Setup.................................................................... 48
Board Layout............................................................................... 48
Evaluation Board Schematics ................................................... 49
AD8334 Evaluation Board PCB Layers................................... 51
Outline Dimensions....................................................................... 53
Ordering Guide .......................................................................... 55
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 4
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configurations and Function Descriptions ........................... 8
Typical Performance Characteristics ........................................... 12
Test Circuits..................................................................................... 20
Measurement Considerations................................................... 20
Theory of Operation ...................................................................... 24
Overview...................................................................................... 24
Low Noise Amplifier (LNA) ..................................................... 25
Variable Gain Amplifier ............................................................ 27
Postamplifier ............................................................................... 28
Applications Information .............................................................. 30
LNA—External Components.................................................... 30
Driving ADCs ............................................................................. 32
Overload ...................................................................................... 32
Optional Input Overload Protection ....................................... 32
Layout, Grounding, and Bypassing.......................................... 33
Multiple Input Matching ........................................................... 33
Disabling the LNA...................................................................... 33
REVISION HISTORY
10/10—Rev. F to Rev. G
Deleted AD8331 Bill of Materials Section and Table 11;
Changes to Quiescent Current per Channel Parameter,
Renumbered Sequentially ............................................................. 43
Changes to Figure 104 ................................................................... 43
Changes to Figure 106 ................................................................... 45
Changes to Figure 107 ................................................................... 46
Changes to Figure 113 ................................................................... 47
Changes to Figure 114 and Board Layout Section..................... 48
Deleted AD8332 Bill of Materials Section and Table 13;
Renumbered Sequentially ............................................................. 48
Changes to Figure 115 ................................................................... 49
Changes to Figure 116 ................................................................... 50
Changes to Figure 117 to Figure 120 ........................................... 51
Changes to Figure 121 ................................................................... 52
Deleted AD8334 Bill of Materials Section and Table 15;
Table 1 ................................................................................................ 6
Changes to Pin 1, Table 3................................................................. 8
Changes to Pin 1 and Pin 28, Table 4 and Pin 4 and Pin 5,
Table 5 ................................................................................................ 9
Changes to Figure 6 and Table 6................................................... 10
Changes to Figure 33...................................................................... 16
Changes to Figure 64...................................................................... 22
Changes to Figure 70...................................................................... 24
Changes to Low Noise Amplifier (LNA) Section and
Figure 74 .......................................................................................... 25
Changes to Figure 94...................................................................... 38
Changes to General Descriptions Section, Figure 95 Caption,
Table 10, and Board Layout Section............................................. 39
Changes to Figure 96...................................................................... 40
Changes to Figure 97...................................................................... 41
Changes to Figure 98 and Figure 103........................................... 42
Renumbered Sequentially ............................................................. 54
Rev. G | Page 2 of 56
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