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AD5934 Scheda tecnica(PDF) 2 Page - Analog Devices |
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AD5934 Scheda tecnica(HTML) 2 Page - Analog Devices |
2 / 32 page AD5934 Rev. 0 | Page 2 of 32 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Specifications..................................................................................... 3 I2C Serial Interface Timing Characteristics .................................. 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Descriptions.............................................. 7 Typical Performance Characteristics ............................................. 8 Terminology .................................................................................... 10 System Description......................................................................... 11 Transmit Stage............................................................................. 12 Frequency Sweep Command Sequence................................... 13 Receive Stage ............................................................................... 13 DFT Operation ........................................................................... 13 Impedance Calculation .................................................................. 14 Magnitude Calculation .............................................................. 14 Gain Factor Calculation ............................................................ 14 Impedance Calculation Using Gain Factor............................. 14 Gain Factor Variation with Frequency .................................... 14 Two-Point Calibration ............................................................... 15 Two-Point Gain Factor Calculation ......................................... 15 Gain Factor Setup Configuration............................................. 15 Gain Factor Recalculation ......................................................... 15 Gain Factor Temperature Variation......................................... 16 Impedance Error ........................................................................ 16 Performing a Frequency Sweep .................................................... 18 Register Map ................................................................................... 19 Control Register ......................................................................... 19 Start Frequency Register ........................................................... 20 Frequency Increment Register.................................................. 20 Number of Increments Register ............................................... 21 Number of Settling Time Cycles Register ............................... 21 Status Register............................................................................. 22 Real and Imaginary Data Registers (16 Bits).......................... 22 Serial Bus Interface......................................................................... 23 General I2C Timing.................................................................... 23 Writing/Reading to the AD5934 .............................................. 24 Block Write.................................................................................. 24 AD5934 Read Operations ......................................................... 25 Typical Applications....................................................................... 26 Biomedical: Noninvasive Blood impedance Measurement .. 26 Sensor/Complex Impedance Measurement............................ 26 Electro-Impedance Spectroscopy............................................. 27 Choosing a Reference for the AD5934 ........................................ 28 Layout and Configuration............................................................. 29 Power Supply Bypassing and Grounding................................ 29 Outline Dimensions ....................................................................... 30 Ordering Guide .......................................................................... 30 REVISION HISTORY 6/05—Revision 0: Initial Version |
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