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AD5933 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD5933
Beschreibung 1 MSPS 12-Bit Impedance Converter
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
AD5933 Datasheet, Funktion
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
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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
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AD5933 Datasheet, Funktion
Data Sheet
REVISION HISTORY
5/13—Rev. D to Rev. E
Added Automotive Information (Throughout) ............................1
Changed Sampling Rate from 250 kSPS to 1 MSPS .....................5
Changes to Table 7 ..........................................................................21
Deleted Choosing a Reference for the AD5933 Section ............34
Changes to Ordering Guide...........................................................40
12/11—Rev. C to Rev. D
Changes to Impedance Error Section...........................................19
Removed Figure 26 and Figure 27;
Renumbered Sequentially ..............................................................19
Removed Figure 28, Figure 29, Figure 30, Figure 31 ..................20
Changes to Figure 39 ......................................................................37
Changes to Figure 40 ......................................................................38
Changes to Figure 41 ......................................................................39
Changes to Figure 42 ......................................................................40
8/10—Rev. B to Rev. C
Changes to Impedance Error Section...........................................19
Changes to Figure 45 ......................................................................38
Changes to U4 Description in Table 19........................................42
AD5933
2/10—Rev. A to Rev. B
Changes to General Description .....................................................1
5/08—Rev. 0 to Rev. A
Changes to Layout.............................................................. Universal
Changes to Figure 1 ..........................................................................1
Changes to Table 1 ............................................................................4
Changes to Figure 17 ......................................................................13
Changes to System Description Section.......................................13
Changes to Figure 19 ......................................................................14
Changes to Figure 24 ......................................................................18
Changes to Impedance Error Section...........................................19
Added Measuring the Phase Across an Impedance Section .....21
Changes to Register Map Section .................................................24
Added Measuring Small Impedances Section.............................31
Changes to Table 18 ........................................................................35
Added Evaluation Board Section ..................................................37
Changes to Ordering Guide...........................................................43
9/05—Revision 0: Initial Version
Rev. E | Page 3 of 40

6 Page









AD5933 pdf, datenblatt
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
35
MEAN = 1.9824
SIGMA = 0.0072
30
25
20
15
10
5
0
1.92 1.94 1.96 1.98 2.00 2.02 2.04 2.06
VOLTAGE (V)
Figure 4. Range 1 Output Excitation Voltage Distribution, VDD = 3.3 V
30
MEAN = 1.4807
SIGMA = 0.0252
25
20
15
10
5
0
1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75
VOLTAGE (V)
Figure 5. Range 1 DC Bias Distribution, VDD = 3.3 V
30
MEAN = 0.9862
SIGMA = 0.0041
25
20
15
10
5
0
0.95 0.96 0.97 0.98 0.99 1.00 1.01 1.02
VOLTAGE (V)
Figure 6. Range 2 Output Excitation Voltage Distribution, VDD = 3.3 V
AD5933
30
MEAN = 0.7543
SIGMA = 0.0099
25
20
15
10
5
0
0.68 0.70 0.72 0.74 0.76 0.78 0.80 0.82 0.84 0.86
VOLTAGE (V)
Figure 7. Range 2 DC Bias Distribution, VDD = 3.3 V
30
MEAN = 0.3827
SIGMA = 0.00167
25
20
15
10
5
0
0.370
0.375
0.380
0.385
0.390
0.395
0.400
VOLTAGE (V)
Figure 8. Range 3 Output Excitation Voltage Distribution, VDD = 3.3 V
30
MEAN = 0.3092
SIGMA = 0.0014
25
20
15
10
5
0
0.290
0.295
0.300
0.305
0.310
0.315
0.320
VOLTAGE (V)
Figure 9. Range 3 DC Bias Distribution, VDD = 3.3 V
Rev. E | Page 9 of 40

12 Page





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