Evaluation Board for the 250 kSPS 12-Bit
Impedance Converter Network Analyzer
Preliminary Technical Data
EVAL-AD5934EB
Rev. PrC
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards as supplied “as is” and without warranties of any kind, express, implied, or
statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of evaluation boards. Information furnished by Analog
Devices is believed to be accurate and reliable. However, no 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. Analog Devices reserves the right to change devices or specifications at any time
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Evaluation boards are not authorized to be used in life support devices or systems.
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©2005–2007 Analog Devices, Inc. All rights reserved.
FEATURES
Full-featured evaluation board for the AD5934
Graphic user interface software with frequency sweep
capability for board control and data analysis
Various power supply linking options
Standalone capability with serial I
2
C loading from on-board
microcontroller
System clock provided by external 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 document describes the evaluation board for the AD5934
and the application software developed to interface to the device.
The AD5934 is a high precision impedance converter system that
combines an on-board frequency generator with a 12-bit, 250 kSPS
ADC. The frequency generator allows an external complex im-
pedance 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 at each
excitation frequency. The AD5934 operates from a 2.7 V to
5.5 V supply.
Other on-board components include an ADR423 3.0 V reference
that acts as a stable supply voltage for the separate analog and
digital sections of the device and an ADP3303 ultrahigh precision
regulator that acts as a supply to the on-board universal serial bus
controller, which interfaces to the AD5934. The user can power
the entire circuitry from the USB port of a computer. The eval-
uation board also has a high performance, trimmed, 16 MHz,
surface-mount crystal that can act as a system clock for the
AD5934, if required.
The various link options available on the evaluation board are
explained in Table 2. Interfacing to the AD5934 is through a
USB microcontroller, which generates the I
2
C signals necessary
to communicate with the AD5934.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
AD5934 is available from Analog Devices, Inc., at www.analog.com
and should be consulted when using the evaluation board.
FUNCTIONAL BLOCK DIAGRAM
VOUT
VIN
RFB
SDA
SCL
MCLK
DVDD
AGND1,
AGND2
DGND
AD5934
USB HUB
J1
ADP3303
CRYSTAL
1 2
J3
1 2
J4
1 2
J5
CLK1
EXTERNAL CLOCK
1 2
J6
ADR423
1 2
J2
LK1
LK2
LK6
LK7
LK4
LK5
LK10
VIN
VOUT
IMPEDANCE UNDER TEST
VBIAS
VBIAS
AMPLIFIER SUPPLY
(VDD-AMP)
LK12
LK3
DIGITAL SUPPLY
(DVDD_5V)
ANALOG SUPPLY 1
(AVDD-SIG)
ANALOG SUPPLY 2
(AVDD-REF)
REFERENCE SUPPLY
(VDD-REF)
054
49
-00
1
AVDD2
AVDD1
USB
MICROCONTROLLER
Figure 1. AD5934 Evaluation Board Block Diagram
