link to page 4 link to page 6 link to page 8 link to page 8 link to page 9 link to page 10 link to page 11 link to page 11 link to page 12 link to page 12 link to page 12 link to page 12 link to page 13 link to page 13 link to page 14 link to page 14 link to page 15 link to page 15 link to page 15 link to page 15 link to page 16 link to page 17 link to page 17 link to page 18 link to page 19 link to page 19 link to page 19 link to page 19 link to page 19 link to page 20 link to page 20 link to page 21 link to page 21 AD7791Data SheetTABLE OF CONTENTS AD7791—Specifications .. 3 Noise Performance ... 14 Timing Characteristics, ... 5 Reduced Current Modes ... 14 Absolute Maximum Ratings .. 7 Digital Interface .. 15 ESD Caution .. 7 Single Conversion Mode ... 16 Pin Configuration and Function Descriptions ... 8 Continuous Conversion Mode ... 16 Typical Performance Characteristics ... 9 Continuous Read Mode .. 17 On-chip Registers ... 10 Circuit Description... 18 Communications Register (RS1, RS0 = 0, 0) .. 10 Analog Input Channel ... 18 Status Register (RS1, RS0 = 0, 0; Bipolar/Unipolar Configuration .. 18 Power-on/Reset = 0x8C) ... 11 Data Output Coding .. 18 Mode Register (RS1, RS0 = 0, 1; Power-on/Reset = 0x02) .. 11 Reference Input ... 18 Filter Register (RS1, RS0 = 1, 0; VDD Monitor .. 19 Power-on/Reset = 0x04) .. 12 Grounding and Layout .. 19 Data Register (RS1, RS0 = 1, 1; Outline Dimensions ... 20 Power-on/Reset = 0x000000) .. 13 Ordering Guide .. 20 ADC Circuit Information .. 14 Overview .. 14 REVISION HISTORY 3/13—Rev. 0 to Rev. A Moved ESD Caution Section .. 7 Changes to Figure 13 ... 15 Changes to Reference Input Section ... 18 Updated Outline Dimensions .. 20 Changes to Ordering Guide ... 20 8/03—Revision 0: Initial Version Rev. A | Page 2 of 20 Document Outline AD7791—Specifications Timing Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics On-chip Registers Communications Register (RS1, RS0 = 0, 0) Status Register (RS1, RS0 = 0, 0; Power-on/Reset = 0x8C) Mode Register (RS1, RS0 = 0, 1; Power-on/Reset = 0x02) Filter Register (RS1, RS0 = 1, 0; Power-on/Reset = 0x04) Data Register (RS1, RS0 = 1, 1; Power-on/Reset = 0x000000) ADC Circuit Information Overview Noise Performance Reduced Current Modes Digital Interface Single Conversion Mode Continuous Conversion Mode Continuous Read Mode Circuit Description Analog Input Channel Bipolar/Unipolar Configuration Data Output Coding Reference Input VDD Monitor Grounding and Layout Outline Dimensions Ordering Guide
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