Datasheet AD7762 (Analog Devices) - 3

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AD7762 Data Sheet TABLE OF CONTENTS
Features .. 1 Driving the AD7762 ... 16 Applications ... 1 Using the AD7762 .. 17 Functional Block Diagram .. 1 Bias Resistor Selection ... 17 General Description ... 1 Decoupling and Layout Recommendations.. 18 Revision History ... 2 Supply Decoupling ... 19 Specifications ... 3 Additional Decoupling .. 19 Timing Specifications ... 5 Reference Voltage Filtering ... 19 Timing Diagrams .. 5 Differential Amplifier Components .. 19 Absolute Maximum Ratings .. 6 Layout Considerations ... 19 ESD Caution .. 6 Programmable FIR Filter ... 20 Pin Configuration and Function Descriptions ... 7 Downloading a User-Defined Filter .. 21 Terminology .. 9 Example Filter Download ... 21 Typical Performance Characteristics ... 10 AD7762 Registers ... 23 Theory of Operation .. 13 Control Register 1—Reg 0x0001 .. 23 AD7762 Interface .. 14 Control Register 2—Address 0x0002 .. 23 Reading Data ... 14 Status Register (Read Only) .. 24 Sharing the Parallel Bus ... 14 Offset Register—Address 0x0003 ... 24 Writing to the AD7762 .. 14 Gain Register—Address 0x0004 ... 24 Reading Status and Other Registers ... 14 Overrange Register—Address 0x0005 ... 24 Clocking the AD7762 .. 15 Outline Dimensions ... 25 Example 1 .. 15 Ordering Guide .. 25 Example 2 .. 15
REVISION HISTORY 1/14—Rev. 0 to Rev. A
Added Exposed Pad Notation, Figure 4 and Table 5………….. 7 Change to Figure 31……………………………………………20 Updated Outline Dimensions…………………………………25
8/05—Revision 0: Initial Version
Rev. A | Page 2 of 28 Document Outline Features Applications Functional Block Diagram General Description Table of Contents Revision History Specifications Timing Specifications Timing Diagrams Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Terminology Typical Performance Characteristics Theory of Operation AD7762 Interface Reading Data Sharing the Parallel Bus Writing to the AD7762 Reading Status and Other Registers Clocking the AD7762 Example 1 Example 2 Driving the AD7762 Using the AD7762 Bias Resistor Selection Decoupling and Layout Recommendations Supply Decoupling Additional Decoupling Reference Voltage Filtering Differential Amplifier Components Layout Considerations Programmable FIR Filter Downloading a User-Defined Filter Example Filter Download AD7762 Registers Control Register 1—Reg 0x0001 Default Value 0x001A Control Register 2—Address 0x0002 Default Value 0x009B Status Register (Read Only) Offset Register—Address 0x0003 Non-bitmapped, Default Value 0x0000 Gain Register—Address 0x0004 Non-bitmapped, Default Value 0xA000 Overrange Register—Address 0x0005 Non-bitmapped, Default Value 0xCCCC Outline Dimensions Ordering Guide