Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsAD5934YRSZ

AD5934 Data Sheet

Rev. C | Page 2 of 32

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 3

Specifications ..................................................................................... 4

C Serial Interface Timing Characteristics .............................. 6

Absolute Maximum Ratings ............................................................ 7

ESD Caution .................................................................................. 7

Pin Configuration and Function Descriptions ............................. 8

Typical Performance Characteristics ............................................. 9

Terminology .................................................................................... 11

System Description ......................................................................... 12

Transmit Stage ............................................................................. 13

Frequency Sweep Command Sequence ................................... 14

Receive Stage ............................................................................... 14

DFT Operation ........................................................................... 14

Impedance Calculation .................................................................. 15

Magnitude Calculation .............................................................. 15

Gain Factor Calculation ............................................................ 15

Impedance Calculation Using Gain Factor ............................. 15

Gain Factor Variation with Frequency .................................... 15

2-Point Calibration ..................................................................... 16

2-Point Gain Factor Calculation .............................................. 16

Gain Factor Setup Configuration ............................................. 16

Gain Factor Recalculation ......................................................... 16

Gain Factor Temperature Variation ......................................... 17

Impedance Error ......................................................................... 17

Measuring the Phase Across an Impedance ........................... 17

Performing a Frequency Sweep .................................................... 19

Control Register (Register Address 0x80, Register Address

0x81) ............................................................................................. 20

Start Frequency Register (Register Address 0x82, Register

Address 0x83, Register Address 0x84) .................................... 21

Frequency Increment Register (Register Address 0x85,

Number of Increments Register (Register Address 0x88,

Number of Settling Time Cycles Register (Register Address

0x8A, Register Address 0x8B) .................................................. 22

Status Register (Register Address 0x8F) .................................. 22

Real and Imaginary Data Registers (16 Bits—Register Address

0x94, Register Address 0x95, Register Address 0x96, Register

Address 0x97) .............................................................................. 23

Serial Bus Interface ......................................................................... 24

General I

C Timing .................................................................... 24

Writing/Reading to the AD5934 .............................................. 25

Block Write .................................................................................. 25

Read Operations ......................................................................... 26

Typical Applications ....................................................................... 27

Measuring Small Impedances ................................................... 27

Biomedical: Noninvasive Blood impedance Measurement .. 28

Sensor/Complex Impedance Measurement ............................ 29

Electro-Impedance Spectroscopy ............................................. 29

Layout and Configuration ............................................................. 30

Power Supply Bypassing and Grounding ................................ 30

Outline Dimensions ....................................................................... 31

Ordering Guide .......................................................................... 31