Datasheet AD7985 (Analog Devices) - 2

AD7985* PRODUCT PAGE QUICK LINKS Last Content Update: 04/14/2017 COMPARABLE PARTS REFERENCE MATERIALS
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Product Selection Guide
• SAR ADC & Driver Quick-Match Guide
EVALUATION KITS Technical Articles
• AD7985 Evaluation Board • MS-1779: Nine Often Overlooked ADC Specifications • MS-2210: Designing Power Supplies for High Speed ADC
DOCUMENTATION
• MS-2689: Isolating SPI for High Bandwidth Sensors
Application Notes Tutorials
• AN-742: Frequency Domain Response of Switched- • MT-002: What the Nyquist Criterion Means to Your Capacitor ADCs Sampled Data System Design
Data Sheet
• MT-031: Grounding Data Converters and Solving the • AD7985: 16-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP Mystery of "AGND" and "DGND" Data Sheet
Technical Books DESIGN RESOURCES
• The Data Conversion Handbook, 2005 • AD7985 Material Declaration
User Guides
• PCN-PDN Information • UG-727: Evaluating the AD7944/AD7985/AD7986 14-/16-/ • Quality And Reliability 18-Bit, PulSAR ADCs • Symbols and Footprints
REFERENCE DESIGNS DISCUSSIONS
• CN0260 View all AD7985 EngineerZone Discussions.
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Document Outline FEATURES APPLICATIONS APPLICATION DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION CONVERSION MODES OF OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE VOLTAGE REFERENCE INPUT Internal Reference, REF = 4.096 V (PDREF Low) External 1.2 V Reference and Internal Buffer (PDREF High) External Reference (PDREF High, REFIN Low) Reference Decoupling POWER SUPPLY DIGITAL INTERFACE DATA READING OPTIONS Reading During Conversion, Fast Host (Turbo or Normal Mode) Split-Reading, Any Speed Host (Turbo or Normal Mode) Reading During Acquisition, Any Speed Host (Turbo or Normal Mode) /CS MODE, 3-WIRE WITHOUT BUSY INDICATOR /CS MODE, 3-WIRE WITH BUSY INDICATOR /CS MODE, 4-WIRE WITHOUT BUSY INDICATOR /CS MODE, 4-WIRE WITH BUSY INDICATOR CHAIN MODE WITHOUT BUSY INDICATOR CHAIN MODE WITH BUSY INDICATOR APPLICATIONS INFORMATION LAYOUT EVALUATING THE AD7985 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE