link to page 1 link to page 1 link to page 1 link to page 1 link to page 1 link to page 3 link to page 4 link to page 6 link to page 7 link to page 7 link to page 7 link to page 7 link to page 8 link to page 11 link to page 14 link to page 16 link to page 16 link to page 17 link to page 17 link to page 17 link to page 18 link to page 18 link to page 20 link to page 22 link to page 23 link to page 25 link to page 25 link to page 26 link to page 26 AD7656A-1Data SheetTABLE OF CONTENTS Features .. 1 Theory of Operation .. 15 Applications ... 1 Converter Details ... 15 Functional Block Diagram .. 1 ADC Transfer Function ... 16 General Description ... 1 Internal/External Reference .. 16 Product Highlights ... 1 Typical Connection Diagram ... 16 Revision History ... 2 Driving the Analog Inputs .. 17 Specifications ... 3 Interface Options .. 17 Timing Specifications .. 5 Software Selection of ADCs .. 19 Absolute Maximum Ratings .. 6 Serial Read Operation .. 21 Power Supply Sequencing ... 6 Daisy-Chain Mode (DCEN = 1, SER/PAR/SEL = 1) ... 22 Thermal Resistance .. 6 Application Hints ... 24 ESD Caution .. 6 Layout .. 24 Pin Configuration and Function Descriptions ... 7 Outline Dimensions ... 25 Typical Performance Characteristics ... 10 Ordering Guide .. 25 Terminology .. 13 REVISION HISTORY 12/13—Revision 0: Initial Version Rev. 0 | Page 2 of 28 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS POWER SUPPLY SEQUENCING THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION CONVERTER DETAILS Track-and-Hold Amplifiers Analog Input ADC TRANSFER FUNCTION INTERNAL/EXTERNAL REFERENCE TYPICAL CONNECTION DIAGRAM DRIVING THE ANALOG INPUTS INTERFACE OPTIONS Parallel Interface (SER/PAR/SEL = 0) SOFTWARE SELECTION OF ADCS Changing the Analog Input Range (H/S SEL = 0) Changing the Analog Input Range (H/S SEL = 1) Serial Interface (SER/PAR/SEL = 1) SERIAL READ OPERATION DAISY-CHAIN MODE (DCEN = 1, SER/PAR/SEL = 1) Standby/Partial Power-Down Modes of Operation(SER/PAR/SEL = 0 or SER/PAR/SEL = 1) APPLICATION HINTS LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE
