Evaluation Board for the 1 MSPS 12-Bit
Impedance Converter Network Analyzer
Preliminary Technical Data
EVAL AD5933-U1
Rev.
PrA
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infringements of patents or other rights of third parties that may result from its use.
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© 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Full-featured evaluation board for the AD5933
Graphic user interface software with frequency sweep
capability for board control and data analysis
Various linking options
Standalone capability with serial I
2
C loading for selectable
system clock from PLL, RC oscillator, external clock
APPLICATIONS
Complex impedance measurement
Corrosion monitoring
Impedance spectrometry
Biomedical and automotive sensors
Proximity sensors
DFT processing
GENERAL DESCRIPTION
This data sheet describes the evaluation board for the AD5933
and the application software developed to interface to the
device. The AD5933 is a 1MSPS 12-bit high precision
impedance converter systems. The AD5933 combines an on
board frequency generator with a 12-bit 1 MSPS ADC. The
frequency generator allows an unknown external impedance to
be excited with a known frequency. The response signal from
the impedance is sampled by the on board ADC, and the DFT is
processed by an on board DSP engine. The AD5933 also
contains an internal temperature sensor with 13-bit resolution.
The part operates from a 3.0 V to 5.5 V supply. Other on board
components include two ADP3303 ultrahigh precision
reference to provide stable 3.3 V references to act as a stable
supply voltages for the separate analog and digital sections of
the device and to act as a supply to the on board universal serial
bus controller, which interfaces to the device. The evaluation
board also has a high performance trimmed 16 MHz surface-
mount crystal as a system clock to the AD5933, if required.
The various link options located around the evaluation board
are explained in Table 2. Interfacing to the AD5933 is through a
Cypress USB microcontroller, which generates the I
2
C signals
necessary to communicate to the AD5933.The user interfaces to
the USB microcontroller through a Visual Basic® graphic user
interface located on and run from the user PC.
More information on the AD5933 is available from Analog
Devices at www.analog.com and should be consulted when
using the evaluation board.
FUNCTIONAL BLOCK DIAGRAM
05435-001
USB HUB
USB
MICROCONTROLLER
ADP3303
REFERENCE
V
BIAS
SCL
SDA
D
GND
A
GND
1
A
GND
2
V
BIAS
VIN
V
OUT
R
FB
16MHz
CRYSTAL
M
CLK
D
VDD
A
VDD
1
A
VDD
2
DIGITAL SUPPLY
EXTERNAL
AMPLIFIER
AD5933
ADP3303
REFERENCE
ANALOG
SUPPLY1
ANALOG
SUPPLY2
AMPLIFIER
SUPPLY
EXTERNAL
CLOCK
Figure 1.
