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AD7156BCPZ-REEL7 Arkusz danych(PDF) 2 Page - Analog Devices |
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AD7156BCPZ-REEL7 Arkusz danych(HTML) 2 Page - Analog Devices |
2 / 28 page AD7156 Rev. 0 | Page 2 of 28 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Specifications .................................................................. 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8 Theory of Operation ...................................................................... 11 Capacitance-to-Digital Converter............................................ 11 CAPDAC ..................................................................................... 11 Comparator and Threshold Modes.......................................... 12 Adaptive Threshold.................................................................... 12 Sensitivity..................................................................................... 12 Data Average ............................................................................... 13 Hysteresis..................................................................................... 13 Timeout........................................................................................ 13 Auto-DAC Adjustment.............................................................. 14 Power-Down Timer ................................................................... 14 Register Descriptions ..................................................................... 15 Status Register ............................................................................. 16 Data Registers ............................................................................. 17 Average Registers........................................................................ 18 Fixed Threshold Registers ......................................................... 18 Sensitivity Registers ................................................................... 18 Timeout Registers....................................................................... 18 Setup Registers............................................................................ 19 Configuration Register .............................................................. 20 Power-Down Timer Register .................................................... 21 CAPDAC Registers .................................................................... 21 Serial Number Register.............................................................. 21 Chip ID Register......................................................................... 21 Serial Interface ................................................................................ 22 Read Operation........................................................................... 22 Write Operation.......................................................................... 22 AD7156 Reset ............................................................................. 23 General Call ................................................................................ 23 Hardware Design Considerations ................................................ 24 Overview ..................................................................................... 24 Parasitic Capacitance to Ground.............................................. 24 Parasitic Resistance to Ground................................................. 24 Parasitic Parallel Resistance ...................................................... 24 Parasitic Serial Resistance ......................................................... 25 Input Overvoltage Protection ................................................... 25 Input EMC Protection ............................................................... 25 Power Supply Decoupling and Filtering.................................. 25 Application Examples ................................................................ 26 Outline Dimensions ....................................................................... 27 Ordering Guide .......................................................................... 27 REVISION HISTORY 10/08—Revision 0: Initial Version |
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