Datasheet AD7623 (Analog Devices) - 3

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AD7623 TABLE OF CONTENTS
Features .. 1 Analog Inputs ... 17 Applications... 1 Driver Amplifier Choice ... 17 Functional Block Diagram .. 1 Voltage Reference Input .. 18 General Description ... 1 Power Supply... 19 Product Highlights ... 1 Power Dissipation vs. Throughput .. 20 Specifications... 3 Conversion Control ... 20 Timing Specifications... 5 Interfaces.. 21 Serial Clock Timing Specifications .. 6 Digital Interface.. 21 Absolute Maximum Ratings.. 7 Parallel Interface... 21 ESD Caution.. 7 Serial Interface .. 22 Pin Configuration and Function Descriptions... 8 Master Serial Interface... 22 Terminology .. 11 Slave Serial Interface .. 24 Typical Performance Characteristics ... 12 Microprocessor Interfacing... 26 Theory of Operation .. 15 Application .. 27 Circuit Information.. 15 Layout .. 27 Converter Operation.. 15 Evaluating the AD7623 Performance .. 27 Transfer Functions.. 16 Outline Dimensions ... 28 Typical Connection Diagram ... 17 Ordering Guide .. 28
REVISION HISTORY 7/05—Revision 0: Initial Version
Rev. 0 | Page 2 of 28 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS SPECIFICATIONS TIMING SPECIFICATIONS SERIAL CLOCK TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION TRANSFER FUNCTIONS TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE Single-to-Differential Driver VOLTAGE REFERENCE INPUT Internal Reference (PDBUF = Low, PDREF = Low) External 1.2 V Reference and Internal Buffer (PDREF = High, PBBUF = Low) External Reference (PDBUF = High, PRBUF = High) Reference Decoupling Temperature Sensor POWER SUPPLY Power Sequencing Power-Up POWER DISSIPATION VS. THROUGHPUT CONVERSION CONTROL INTERFACES DIGITAL INTERFACE RESET PARALLEL INTERFACE Master Parallel Interface Slave Parallel Interface 8-Bit Interface (Master or Slave) SERIAL INTERFACE MASTER SERIAL INTERFACE Internal Clock SLAVE SERIAL INTERFACE External Clock External Discontinuous Clock Data Read After Conversion External Clock Data Read During Previous Conversion MICROPROCESSOR INTERFACING SPI Interface (ADSP-219x) APPLICATION LAYOUT EVALUATING THE AD7623 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE