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PDF AD5933 Data sheet ( Hoja de datos )
| Número de pieza | AD5933 | |
| Descripción | 1 MSPS 12-Bit Impedance Converter | |
| Fabricantes | Analog Devices | |
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Data Sheet
1 MSPS, 12-Bit Impedance
Converter, Network Analyzer
AD5933
FEATURES
Programmable output peak-to-peak excitation voltage
to a maximum frequency of 100 kHz
Programmable frequency sweep capability with
serial I2C interface
Frequency resolution of 27 bits (<0.1 Hz)
Impedance measurement range from 1 kΩ to 10 MΩ
Capable of measuring of 100 Ω to 1 kΩ with additional
circuitry
Internal temperature sensor (±2°C)
Internal system clock option
Phase measurement capability
System accuracy of 0.5%
2.7 V to 5.5 V power supply operation
Temperature range: −40°C to +125°C
16-lead SSOP package
Qualified for automotive applications
APPLICATIONS
Electrochemical analysis
Bioelectrical impedance analysis
Impedance spectroscopy
Complex impedance measurement
Corrosion monitoring and protection equipment
Biomedical and automotive sensors
Proximity sensing
Nondestructive testing
Material property analysis
Fuel/battery cell condition monitoring
GENERAL DESCRIPTION
The AD5933 is a high precision impedance converter system
solution that combines an on-board frequency generator with
a 12-bit, 1 MSPS, analog-to-digital converter (ADC). The
frequency generator allows an external complex impedance to
be excited with a known frequency. The response signal from
the impedance is sampled by the on-board ADC and a discrete
Fourier transform (DFT) is processed by an on-board DSP
engine. The DFT algorithm returns a real (R) and imaginary (I)
data-word at each output frequency.
Once calibrated, the magnitude of the impedance and relative
phase of the impedance at each frequency point along the sweep
is easily calculated. This is done off chip using the real and
imaginary register contents, which can be read from the serial
I2C interface.
A similar device, also available from Analog Devices, Inc., is the
AD5934, a 2.7 V to 5.5 V, 250 kSPS, 12-bit impedance converter,
with an internal temperature sensor and is packaged in a 16-
lead SSOP.
FUNCTIONAL BLOCK DIAGRAM
MCLK
AVDD
DVDD
OSCILLATOR
SCL
SDA
I2C
INTERFACE
DDS
CORE
(27 BITS)
TEMPERATURE
SENSOR
DAC
ROUT
VOUT
Z(ω)
REAL IMAGINARY
REGISTER REGISTER
1024-POINT DFT
ADC
(12 BITS)
AGND
DGND
AD5933
GAIN
LPF
Figure 1.
RFB
VIN
VDD/2
Rev. E
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2005–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD5933
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
I2C Serial Interface Timing Characteristics .............................. 6
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configuration and Descriptions.............................................. 8
Typical Performance Characteristics ............................................. 9
Terminology .................................................................................... 12
System Description......................................................................... 13
Transmit Stage............................................................................. 14
Frequency Sweep Command Sequence................................... 15
Receive Stage ............................................................................... 15
DFT Operation ........................................................................... 15
System Clock............................................................................... 16
Temperature Sensor ................................................................... 16
Temperature Conversion Details.............................................. 16
Temperature Value Register ...................................................... 16
Temperature Conversion Formula........................................... 16
Impedance Calculation .................................................................. 17
Magnitude Calculation .............................................................. 17
Gain Factor Calculation ............................................................ 17
Impedance Calculation Using Gain Factor............................. 17
Gain Factor Variation with Frequency .................................... 17
Two-Point Calibration ............................................................... 18
Two-Point Gain Factor Calculation......................................... 18
Gain Factor Setup Configuration............................................. 18
Gain Factor Recalculation ......................................................... 18
Gain Factor Temperature Variation ......................................... 19
Impedance Error......................................................................... 19
Measuring the Phase Across an Impedance ........................... 19
Performing a Frequency Sweep .................................................... 22
Data Sheet
Register Map ................................................................................... 23
Control Register (Register Address 0x80, Register Address
0x81)............................................................................................. 23
Start Frequency Register (Register Address 0x82, Register
Address 0x83, Register Address 0x84) .................................... 24
Frequency Increment Register (Register Address 0x85,
Register Address 0x86, Register Address 0x87) ..................... 25
Number of Increments Register (Register Address 0x88,
Register Address 0x89) .............................................................. 25
Number of Settling Time Cycles Register (Register Address
0x8A, Register Address 0x8B) ................................................. 25
Status Register (Register Address 0x8F).................................. 26
Temperature Data Register (16 Bits—Register Address 0x92,
Register Address 0x93) .............................................................. 26
Real and Imaginary Data Registers (16 Bits—Register
Address 0x94, Register Address 0x95, Register Address 0x96,
Register Address 0x97) .............................................................. 26
Serial Bus Interface......................................................................... 27
General I2C Timing.................................................................... 27
Writing/Reading to the AD5933 .............................................. 28
Block Write.................................................................................. 28
Read Operations ......................................................................... 29
Typical Applications....................................................................... 30
Measuring Small Impedances................................................... 30
Biomedical: Noninvasive Blood Impedance Measurement.. 32
Sensor/Complex Impedance Measurement............................ 32
Electro-Impedance Spectroscopy............................................. 33
Layout and Configuration............................................................. 34
Power Supply Bypassing and Grounding................................ 34
Evaluation Board ............................................................................ 35
Using the Evaluation Board ...................................................... 35
Prototyping Area ........................................................................ 35
Crystal Oscillator (XO) vs. External Clock............................. 35
Schematics................................................................................... 36
Outline Dimensions ....................................................................... 40
Ordering Guide .......................................................................... 40
Automotive Products ................................................................. 40
Rev. E | Page 2 of 40
5 Page 
AD5933
PIN CONFIGURATION AND DESCRIPTIONS
Data Sheet
NC 1
NC 2
NC 3
RFB 4
VIN 5
VOUT 6
NC 7
MCLK 8
AD5933
TOP VIEW
(Not to Scale)
16 SCL
15 SDA
14 AGND2
13 AGND1
12 DGND
11 AVDD2
10 AVDD1
9 DVDD
NC = NO CONNECT
NOTES:
1. IT IS RECOMMENDED TO TIE ALL SUPPLY
CONNECTIONS (PIN 9, PIN 10, AND PIN 11)
AND RUN FROM A SINGLE SUPPLY BETWEEN
2.7V AND 5.5V. IT IS ALSO RECOMMENDED TO
CONNECT ALL GROUND SIGNALS TOGETHER
(PIN 12, PIN 13, AND PIN 14).
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1, 2, 3, 7 NC
No Connect.
4 RFB External Feedback Resistor. Connected from Pin 4 to Pin 5 and used to set the gain of the current-to-voltage
amplifier on the receive side.
5 VIN Input to Receive Transimpedance Amplifier. Presents a virtual earth voltage of VDD/2.
6
VOUT
Excitation Voltage Signal Output.
8
MCLK
The master clock for the system is supplied by the user.
9
DVDD
Digital Supply Voltage.
10
AVDD1
Analog Supply Voltage 1.
11
AVDD2
Analog Supply Voltage 2.
12
DGND
Digital Ground.
13
AGND1
Analog Ground 1.
14
AGND2
Analog Ground 2.
15 SDA I2C Data Input. Open-drain pins requiring 10 kΩ pull-up resistors to VDD.
16 SCL
I2C Clock Input. Open-drain pins requiring 10 kΩ pull-up resistors to VDD.
Rev. E | Page 8 of 40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AD5933.PDF ] | |
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