Analog Devices EVAL-AD5933EBZ User Manual

One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 •
Evaluating the

FEATURES

Full-featured evaluation board for the
Graphic user interface software with frequency sweep
capability for board control and data analysis
Various power supply linking options
Standalone capability with serial I
microcontroller
Selectable system clock options including internal RC
oscillator or on-board 16 MHz crystal

APPLICATIONS

Electrochemical analysis
Impedance spectroscopy
Complex impedance measurement
Corrosion monitoring and protection equipment
Biomedical and automotive sensors
Proximity sensing

GENERAL DESCRIPTION

This user guide describes the
and the application software developed to interface with the device.
The AD5933 is a high precision impedance converter system 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
MCLK
OSCILLATOR
SCL
2
I C
INTERFACE
SDA
REAL IMAGINARY
REGISTER REGISTER
1024-POINT DFT
AGND
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
AD5933 1 MSPS, 12-Bit Impedance Converter Network Analyzer
AD5933
2 C loading from on-board
EVAL-AD5933EBZ evaluation board,

EVALUATION BOARD BLOCK DIAGRAM

V V
DD DD
AVDD DVDD
DDS
CORE
(27 BITS)
TEMPERATURE
SENSOR
AD5933
ADC
GAIN
(12 BITS)
LPF
DGND
Evaluation Board User Guide
known frequency. The on-board ADC samples the response
signal from the impedance, and an on-board DSP engine at each
excitation frequency processes the DFT. The
an internal temperature sensor with 13-bit resolution. The part
operates from a 2.7 V to 5.5 V supply. Other on-board components
include a ADR423
for the separate analog and digital sections of the device and a
ADP3303 ultrahigh precision regulator to act as a supply to the
on-board universal serial bus controller that interfaces to the
AD5933. The user has the option to power the entire circuitry
from the USB port of a computer.
The evaluation board also has a high performance trimmed
16 MHz surface-mount crystal to act as a system clock to the
AD5933, if required. The various link options located around the
evaluation board are listed in Table 1. Interfacing to the
is through a USB microcontroller that generates the I
necessary to communicate with the AD5933. Interfacing to the
USB microcontroller is done through a Visual Basic® graphic user
interface located on and run from the PC. Complete specifications
for the AD5933
from Analog Devices, Inc., and should be consulted in conjunction
with this user guide when using the evaluation board.
1.48V
DAC
VOUT
R
OUT
TRANSMIT SIDE
OUTPUT AMPLIFIER
RFB
VIN
I-V
VDD/2
Figure 1.
Rev. 0 | Page 1 of 28
3.0 V reference to act as a stable supply voltage
are available in the AD5933
1.98V p-p
VDD/2
V
DD
V
DD
−
50kΩ A1
+
47nF
50kΩ
A1, A2 ARE
AD8606
½
R
FB
20kΩ
−
20kΩ
A2
V
DD
+
50kΩ
50kΩ
UG-364
www.analog.com
AD5933 also contains
AD5933
2
C signals
data sheet available
1.98V p-p
Z
UNKNOWN