Datasheet AD7622 (Analog Devices) - 3

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AD7622 TABLE OF CONTENTS
Features .. 1 Multiplexed Inputs ... 17 Applications... 1 Driver Amplifier Choice ... 18 General Description ... 1 Voltage Reference Input .. 19 Functional Block Diagram .. 1 Power Supply... 20 Revision History ... 2 Conversion Control ... 20 Specifications... 3 Interfaces.. 21 Timing Specifications... 5 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 Applications Information .. 15 Application Hints ... 27 Circuit Information.. 15 Layout .. 27 Converter Operation.. 15 Evaluating the AD7622 Performance .. 27 Modes of Operation ... 15 Outline Dimensions ... 28 Transfer Functions.. 16 Ordering Guide .. 28 Typical Connection Diagram.. 17 Analog Inputs.. 17
REVISION HISTORY 6/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 28 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION TIMING SPECIFICATIONS PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS APPLICATIONS INFORMATION CIRCUIT INFORMATION CONVERTER OPERATION MODES OF OPERATION TRANSFER FUNCTIONS TYPICAL CONNECTION DIAGRAM ANALOG INPUTS MULTIPLEXED 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 (PDBUF = Low, PDREF = High) External 2.5 V Reference (PDBUF = High, PDREF = High) Reference Decoupling Temperature Sensor POWER SUPPLY Power Sequencing Power-Up 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 HINTS LAYOUT EVALUATING THE AD7622 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE