Datasheet AD7621 (Analog Devices) - 2

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AD7621 TABLE OF CONTENTS
Specifications... 3 Voltage Reference Input .. 18 Timing Specifications... 5 Power Supply... 19 Serial Clock Timing Specifications .. 6 Power Dissipation vs. Throughput .. 20 Absolute Maximum Ratings.. 7 Conversion Control ... 20 ESD Caution.. 7 Interfaces.. 21 Pin Configuration and Function Descriptions... 8 Digital Interface.. 21 Terminology .. 11 Parallel Interface... 21 Typical Performance Characteristics ... 12 Serial Interface .. 22 Theory of Operation .. 15 Master Serial Interface... 22 Circuit Information.. 15 Slave Serial Interface .. 24 Converter Operation.. 15 Microprocessor Interfacing... 26 Modes of Operation ... 15 Application .. 27 Transfer Functions.. 16 Layout .. 27 Typical Connection Diagram ... 17 Evaluating the AD7621 Performance .. 27 Analog Inputs.. 17 Outline Dimensions ... 28 Driver Amplifier Choice.. 17 Ordering Guide .. 29
REVISION HISTORY 5/05 — Revision 0: Initial Version
Rev. 0 | Page 2 of 32 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 MODES OF OPERATION TRANSFER FUNCTIONS TYPICAL CONNECTION DIAGRAM ANALOG INPUTS DRIVER AMPLIFIER CHOICE Single-to-Differential Driver VOLTAGE REFERENCE INPUT Internal Reference External 1.2 V Reference and Internal Buffer External Reference 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 AD7621 PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE