EVAL-AD5933EB Datasheet, PDF (1/40 Pages) Analog Devices – 1 MSPS, 12-Bit Impedance Converter, Network Analyzer

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
R_OUT
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
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