Datasheet AD7938-6 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 8-Channel, 625 kSPS, 12-Bit Parallel ADCs with a Sequencer |
| Pages / Page | 33 / 3 — AD7938-6. Data Sheet. TABLE OF CONTENTS. REVISION HISTORY. 1/2017—Rev. C … |
| Revision | E |
| File Format / Size | PDF / 832 Kb |
| Document Language | English |
AD7938-6. Data Sheet. TABLE OF CONTENTS. REVISION HISTORY. 1/2017—Rev. C to Rev. D. 2/2007—Rev. 0 to Rev. A
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AD7938-6 Data Sheet TABLE OF CONTENTS
Features ...1 Converter Operation ... 16 Functional Block Diagram...1 ADC Transfer Function ... 16 General Description ..1 Typical Connection Diagram... 17 Product Highlights...1 Analog Input Structure .. 17 Revision History ..2 Analog Inputs .. 18 Specifications ...3 Analog Input Selection .. 20 Timing Specifications...5 Reference ... 21 Absolute Maximum Ratings ..6 Parallel Interface .. 23 ESD Caution ..6 Power Modes of Operation .. 26 Pin Configuration and Function Descriptions...7 Power vs. Throughput Rate.. 27 Typical Performance Characteristics ...9 Microprocessor Interfacing.. 27 Terminology ..11 Application Hints .. 29 On-Chip Registers ...13 Grounding and Layout .. 29 Control Register ...13 PCB Design Guidelines for Chip Scale Package... 29 Sequencer Operation ...14 Evaluating the AD7938-6 Performance ... 29 Shadow Register...14 Outline Dimensions .. 30 Circuit Information ...16 Ordering Guide ... 31
REVISION HISTORY 1/2017—Rev. C to Rev. D
Added Exposed Pad Notation to Outline Dimensions .. 30 Changed CP-32-2 to CP-32-7 ...Throughout Changes to Ordering Guide... 31 Changes to Figure 2 ...7
2/2007—Rev. 0 to Rev. A
Added Figure 3; Renumbered Sequential y..7 Changes to Specifications .. 3 Updated Outline Dimensions ..30 Changes to Figure 13 ... 10 Changes to Ordering Guide ...31 Changes to Sequencer Operation Section.. 14 Changes to Analog Inputs Section... 18
10/2011—Rev. B to Rev. C
Updated Outline Dimensions.. 30 Change to Features Section..1
10/2004—Revision 0: Initial Version 10/2011—Rev. A to Rev. B
Changes to Table 2 ...3 Changes to Figure 2 and Table 5 ..7 Rev. D | Page 2 of 32 Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY ON-CHIP REGISTERS CONTROL REGISTER SEQUENCER OPERATION Writing to the Control Register to Program the Sequencer SHADOW REGISTER CIRCUIT INFORMATION CONVERTER OPERATION ADC TRANSFER FUNCTION TYPICAL CONNECTION DIAGRAM ANALOG INPUT STRUCTURE ANALOG INPUTS Single-Ended Mode Differential Mode Driving Differential Inputs Using an Op Amp Pair Pseudo Differential Mode ANALOG INPUT SELECTION Traditional Multichannel Operation (SEQ = 0, SHDW = 0) Using the Sequencer: Programmable Sequence (SEQ = 0, SHDW = 1 ) Consecutive Sequence (SEQ = 1, SHDW = 1) REFERENCE Digital Inputs VDRIVE Input PARALLEL INTERFACE Reading Data from the AD7938-6 Writing Data to the AD7938-6 POWER MODES OF OPERATION Normal Mode (PM1 = PM0 = 0) Autoshutdown (PM1 = 0; PM0 = 1) Autostandby (PM1 = 1; PM0 = 0) Full Shutdown Mode (PM1 =1; PM0 = 1) POWER vs. THROUGHPUT RATE MICROPROCESSOR INTERFACING AD7938-6 to ADSP-21xx Interface AD7938-6 to ADSP-21065L Interface AD7938-6 to TMS32020, TMS320C25, and TMS320C5x Interface AD7938-6 to 80C186 Interface APPLICATION HINTS GROUNDING AND LAYOUT PCB DESIGN GUIDELINES FOR CHIP SCALE PACKAGE EVALUATING THE AD7938-6 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE
AD7938-6 Data Sheet TABLE OF CONTENTS
Features ...1 Converter Operation ... 16 Functional Block Diagram...1 ADC Transfer Function ... 16 General Description ..1 Typical Connection Diagram... 17 Product Highlights...1 Analog Input Structure .. 17 Revision History ..2 Analog Inputs .. 18 Specifications ...3 Analog Input Selection .. 20 Timing Specifications...5 Reference ... 21 Absolute Maximum Ratings ..6 Parallel Interface .. 23 ESD Caution ..6 Power Modes of Operation .. 26 Pin Configuration and Function Descriptions...7 Power vs. Throughput Rate.. 27 Typical Performance Characteristics ...9 Microprocessor Interfacing.. 27 Terminology ..11 Application Hints .. 29 On-Chip Registers ...13 Grounding and Layout .. 29 Control Register ...13 PCB Design Guidelines for Chip Scale Package... 29 Sequencer Operation ...14 Evaluating the AD7938-6 Performance ... 29 Shadow Register...14 Outline Dimensions .. 30 Circuit Information ...16 Ordering Guide ... 31
REVISION HISTORY 1/2017—Rev. C to Rev. D
Added Exposed Pad Notation to Outline Dimensions .. 30 Changed CP-32-2 to CP-32-7 ...Throughout Changes to Ordering Guide... 31 Changes to Figure 2 ...7
2/2007—Rev. 0 to Rev. A
Added Figure 3; Renumbered Sequential y..7 Changes to Specifications .. 3 Updated Outline Dimensions ..30 Changes to Figure 13 ... 10 Changes to Ordering Guide ...31 Changes to Sequencer Operation Section.. 14 Changes to Analog Inputs Section... 18
10/2011—Rev. B to Rev. C
Updated Outline Dimensions.. 30 Change to Features Section..1
10/2004—Revision 0: Initial Version 10/2011—Rev. A to Rev. B
Changes to Table 2 ...3 Changes to Figure 2 and Table 5 ..7 Rev. D | Page 2 of 32 Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY ON-CHIP REGISTERS CONTROL REGISTER SEQUENCER OPERATION Writing to the Control Register to Program the Sequencer SHADOW REGISTER CIRCUIT INFORMATION CONVERTER OPERATION ADC TRANSFER FUNCTION TYPICAL CONNECTION DIAGRAM ANALOG INPUT STRUCTURE ANALOG INPUTS Single-Ended Mode Differential Mode Driving Differential Inputs Using an Op Amp Pair Pseudo Differential Mode ANALOG INPUT SELECTION Traditional Multichannel Operation (SEQ = 0, SHDW = 0) Using the Sequencer: Programmable Sequence (SEQ = 0, SHDW = 1 ) Consecutive Sequence (SEQ = 1, SHDW = 1) REFERENCE Digital Inputs VDRIVE Input PARALLEL INTERFACE Reading Data from the AD7938-6 Writing Data to the AD7938-6 POWER MODES OF OPERATION Normal Mode (PM1 = PM0 = 0) Autoshutdown (PM1 = 0; PM0 = 1) Autostandby (PM1 = 1; PM0 = 0) Full Shutdown Mode (PM1 =1; PM0 = 1) POWER vs. THROUGHPUT RATE MICROPROCESSOR INTERFACING AD7938-6 to ADSP-21xx Interface AD7938-6 to ADSP-21065L Interface AD7938-6 to TMS32020, TMS320C25, and TMS320C5x Interface AD7938-6 to 80C186 Interface APPLICATION HINTS GROUNDING AND LAYOUT PCB DESIGN GUIDELINES FOR CHIP SCALE PACKAGE EVALUATING THE AD7938-6 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE
