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AD5934 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD5934
Description  Impedance Converter, Network Analyzer
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD5934 Datasheet(HTML) 1 Page - Analog Devices

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250 kSPS, 12-Bit Impedance Converter,
Network Analyzer
Data Sheet
AD5934
Rev. E
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
©2005–2017 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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 100 Ω to 1 kΩ with additional circuitry
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
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 AD5934 is a high precision impedance converter system
solution that combines an on-board frequency generator with a
12-bit, 250 kSPS, 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 using the following two equations:
Magnitude =
2
2
I
R +
Phase = tan−1(I/R)
A similar device, available from Analog Devices, Inc., is the
AD5933, which is a 2.7 V to 5.5 V, 1 MSPS, 12-bit impedance
converter, with an internal temperature sensor, available in a
16-lead SSOP.
FUNCTIONAL BLOCK DIAGRAM
ADC
(12 BITS)
VDD/2
DDS
CORE
(27 BITS)
DAC
VBIAS
Z(ω)
I2C
INTERFACE
IMAGINARY
REGISTER
GAIN
REAL
REGISTER
1024-POINT DFT
LPF
SCL
SDA
DVDD
AVDD
MCLK
AGND
DGND
ROUT
VOUT
AD5934
RFB
VIN
Figure 1.


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