Datasheet AD8331, AD8332, AD8334 (Analog Devices) - 2
| 制造商 | Analog Devices |
| 描述 | Quad VGA with Ultralow Noise Preamplifier and Programmable RIN |
| 页数 / 页 | 55 / 2 — AD8331/AD8332/AD8334. Data Sheet. TABLE OF CONTENTS. REVISION HISTORY … |
| 修订版 | I |
| 文件格式/大小 | PDF / 2.2 Mb |
| 文件语言 | 英语 |
AD8331/AD8332/AD8334. Data Sheet. TABLE OF CONTENTS. REVISION HISTORY 5/2016—Rev. H to Rev. I. 3/2015—Rev. G to Rev. H
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AD8331/AD8332/AD8334 Data Sheet TABLE OF CONTENTS
Features .. 1 Ultrasound TGC Application ... 34 Applications ... 1 High Density Quad Layout ... 34 General Description ... 1 AD8331 Evaluation Board .. 39 Functional Block Diagram .. 1 General Description ... 39 Revision History ... 2 User-Supplied Optional Components ... 39 Specifications ... 4 Measurement Setup.. 39 Absolute Maximum Ratings .. 7 Board Layout ... 39 ESD Caution .. 7 AD8331 Evaluation Board Schematics .. 40 Pin Configurations and Function Descriptions ... 8 AD8331 Evaluation Board PCB Layers ... 42 Typical Performance Characteristics ... 12 AD8332 Evaluation Board .. 43 Test Circuits ... 20 General Description ... 43 Measurement Considerations ... 20 User-Supplied Optional Components ... 43 Theory of Operation .. 24 Measurement Setup.. 43 Overview .. 24 Board Layout ... 43 Low Noise Amplifier (LNA) ... 25 Evaluation Board Schematics ... 44 Variable Gain Amplifier .. 27 AD8332 Evaluation Board PCB Layers ... 46 Postamplifier ... 28 AD8334 Evaluation Board .. 47 Applications Information .. 30 General Description ... 47 LNA—External Components .. 30 Configuring the Input Impedance ... 48 Driving ADCs ... 32 Measurement Setup.. 48 Overload .. 32 Board Layout ... 48 Optional Input Overload Protection ... 32 Evaluation Board Schematics ... 49 Layout, Grounding, and Bypassing .. 33 AD8334 Evaluation Board PCB Layers ... 51 Multiple Input Matching ... 33 Outline Dimensions ... 53 Disabling the LNA .. 33 Ordering Guide .. 55
REVISION HISTORY 5/2016—Rev. H to Rev. I
Changes to Figure 6 and Table 6 ... 10 Changes to Figure 5, and Table 5 .. 9 Changes to Figure 33 .. 16 Updated Outline Dimensions ... 54 Changes to Figure 64 .. 22 Changes to Ordering Guide .. 55 Changes to Figure 70 .. 24 Changes to Low Noise Amplifier (LNA) Section and
3/2015—Rev. G to Rev. H
Figure 74 .. 25 Changes to Pin 29 Description; Table 6 ... 11 Changes to Figure 94 .. 38 Updated Figure 123, Figure 124, Figure 125; Outline Changes to General Descriptions Section, Figure 95 Caption, Dimensions .. 53 Table 10, and Board Layout Section ... 39 Changes to Ordering Guide .. 55 Changes to Figure 96 .. 40 Changes to Figure 97 .. 41
10/2010—Rev. F to Rev. G
Changes to Figure 98 and Figure 103 .. 42 Changes to Quiescent Current per Channel Parameter, Deleted AD8331 Bill of Materials Section and Table 11; Table 1 .. 6 Renumbered Sequential y ... 43 Changes to Pin 1, Table 3 ... 8 Changes to Figure 104 ... 43 Changes to Pin 1 and Pin 28, Table 4 and Pin 4 and Pin 5, Changes to Figure 106 ... 45 Table 5 .. 9 Changes to Figure 107 ... 46 Rev. I | Page 2 of 55 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS MEASUREMENT CONSIDERATIONS THEORY OF OPERATION OVERVIEW LOW NOISE AMPLIFIER (LNA) Active Impedance Matching LNA Noise VARIABLE GAIN AMPLIFIER X-AMP VGA Gain Control VGA Noise Common-Mode Biasing POSTAMPLIFIER Noise Output Clamping APPLICATIONS INFORMATION LNA—EXTERNAL COMPONENTS Gain Input VCM Input Logic Inputs—ENB, MODE, and HILO Optional Output Voltage Limiting Output Decoupling DRIVING ADCs OVERLOAD OPTIONAL INPUT OVERLOAD PROTECTION LAYOUT, GROUNDING, AND BYPASSING MULTIPLE INPUT MATCHING DISABLING THE LNA ULTRASOUND TGC APPLICATION HIGH DENSITY QUAD LAYOUT AD8331 EVALUATION BOARD GENERAL DESCRIPTION USER-SUPPLIED OPTIONAL COMPONENTS MEASUREMENT SETUP BOARD LAYOUT AD8331 EVALUATION BOARD SCHEMATICS AD8331 EVALUATION BOARD PCB LAYERS AD8332 EVALUATION BOARD GENERAL DESCRIPTION USER-SUPPLIED OPTIONAL COMPONENTS MEASUREMENT SETUP BOARD LAYOUT EVALUATION BOARD SCHEMATICS AD8332 EVALUATION BOARD PCB LAYERS AD8334 EVALUATION BOARD GENERAL DESCRIPTION CONFIGURING THE INPUT IMPEDANCE Driving the VGA from an External Source or Using the LNA to Drive an External Load Using the Clamp Circuit Viewing Signals MEASUREMENT SETUP BOARD LAYOUT EVALUATION BOARD SCHEMATICS AD8334 EVALUATION BOARD PCB LAYERS OUTLINE DIMENSIONS ORDERING GUIDE
AD8331/AD8332/AD8334 Data Sheet TABLE OF CONTENTS
Features .. 1 Ultrasound TGC Application ... 34 Applications ... 1 High Density Quad Layout ... 34 General Description ... 1 AD8331 Evaluation Board .. 39 Functional Block Diagram .. 1 General Description ... 39 Revision History ... 2 User-Supplied Optional Components ... 39 Specifications ... 4 Measurement Setup.. 39 Absolute Maximum Ratings .. 7 Board Layout ... 39 ESD Caution .. 7 AD8331 Evaluation Board Schematics .. 40 Pin Configurations and Function Descriptions ... 8 AD8331 Evaluation Board PCB Layers ... 42 Typical Performance Characteristics ... 12 AD8332 Evaluation Board .. 43 Test Circuits ... 20 General Description ... 43 Measurement Considerations ... 20 User-Supplied Optional Components ... 43 Theory of Operation .. 24 Measurement Setup.. 43 Overview .. 24 Board Layout ... 43 Low Noise Amplifier (LNA) ... 25 Evaluation Board Schematics ... 44 Variable Gain Amplifier .. 27 AD8332 Evaluation Board PCB Layers ... 46 Postamplifier ... 28 AD8334 Evaluation Board .. 47 Applications Information .. 30 General Description ... 47 LNA—External Components .. 30 Configuring the Input Impedance ... 48 Driving ADCs ... 32 Measurement Setup.. 48 Overload .. 32 Board Layout ... 48 Optional Input Overload Protection ... 32 Evaluation Board Schematics ... 49 Layout, Grounding, and Bypassing .. 33 AD8334 Evaluation Board PCB Layers ... 51 Multiple Input Matching ... 33 Outline Dimensions ... 53 Disabling the LNA .. 33 Ordering Guide .. 55
REVISION HISTORY 5/2016—Rev. H to Rev. I
Changes to Figure 6 and Table 6 ... 10 Changes to Figure 5, and Table 5 .. 9 Changes to Figure 33 .. 16 Updated Outline Dimensions ... 54 Changes to Figure 64 .. 22 Changes to Ordering Guide .. 55 Changes to Figure 70 .. 24 Changes to Low Noise Amplifier (LNA) Section and
3/2015—Rev. G to Rev. H
Figure 74 .. 25 Changes to Pin 29 Description; Table 6 ... 11 Changes to Figure 94 .. 38 Updated Figure 123, Figure 124, Figure 125; Outline Changes to General Descriptions Section, Figure 95 Caption, Dimensions .. 53 Table 10, and Board Layout Section ... 39 Changes to Ordering Guide .. 55 Changes to Figure 96 .. 40 Changes to Figure 97 .. 41
10/2010—Rev. F to Rev. G
Changes to Figure 98 and Figure 103 .. 42 Changes to Quiescent Current per Channel Parameter, Deleted AD8331 Bill of Materials Section and Table 11; Table 1 .. 6 Renumbered Sequential y ... 43 Changes to Pin 1, Table 3 ... 8 Changes to Figure 104 ... 43 Changes to Pin 1 and Pin 28, Table 4 and Pin 4 and Pin 5, Changes to Figure 106 ... 45 Table 5 .. 9 Changes to Figure 107 ... 46 Rev. I | Page 2 of 55 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS MEASUREMENT CONSIDERATIONS THEORY OF OPERATION OVERVIEW LOW NOISE AMPLIFIER (LNA) Active Impedance Matching LNA Noise VARIABLE GAIN AMPLIFIER X-AMP VGA Gain Control VGA Noise Common-Mode Biasing POSTAMPLIFIER Noise Output Clamping APPLICATIONS INFORMATION LNA—EXTERNAL COMPONENTS Gain Input VCM Input Logic Inputs—ENB, MODE, and HILO Optional Output Voltage Limiting Output Decoupling DRIVING ADCs OVERLOAD OPTIONAL INPUT OVERLOAD PROTECTION LAYOUT, GROUNDING, AND BYPASSING MULTIPLE INPUT MATCHING DISABLING THE LNA ULTRASOUND TGC APPLICATION HIGH DENSITY QUAD LAYOUT AD8331 EVALUATION BOARD GENERAL DESCRIPTION USER-SUPPLIED OPTIONAL COMPONENTS MEASUREMENT SETUP BOARD LAYOUT AD8331 EVALUATION BOARD SCHEMATICS AD8331 EVALUATION BOARD PCB LAYERS AD8332 EVALUATION BOARD GENERAL DESCRIPTION USER-SUPPLIED OPTIONAL COMPONENTS MEASUREMENT SETUP BOARD LAYOUT EVALUATION BOARD SCHEMATICS AD8332 EVALUATION BOARD PCB LAYERS AD8334 EVALUATION BOARD GENERAL DESCRIPTION CONFIGURING THE INPUT IMPEDANCE Driving the VGA from an External Source or Using the LNA to Drive an External Load Using the Clamp Circuit Viewing Signals MEASUREMENT SETUP BOARD LAYOUT EVALUATION BOARD SCHEMATICS AD8334 EVALUATION BOARD PCB LAYERS OUTLINE DIMENSIONS ORDERING GUIDE