Evaluation Board for the 1 MSPS 12-Bit

Impedance Converter Network Analyzer

Preliminary Technical Data

EVAL-AD5933EB

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

Devicesforitsuse,norforanyinfringementsofpatentsorotherrightsofthirdpartiesthatmayresult

from its use. Analog Devices reserves the right to change devices or specifications at any time

without notice.Trademarks and registered trademarks are the property of their respective owners.

Evaluationboardsarenotauthorizedtobeusedinlifesupportdevicesorsystems.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

©2005–2007 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 power supply linking options

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 document describes the evaluation board for the AD5933

and the application software developed to interface to the device.

The AD5933 is a high precision impedance converter system that

combines an on-board frequency generator with a 12-bit, 1 MSPS

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 AD5933 also contains an internal

temperature sensor with 13-bit resolution and 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 AD5933. 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

AD5933, if required.

The various link options available on the evaluation board are

explained in Table 2. Interfacing to the AD5933 is through a

to communicate with 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, 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

AD5933

USB HUB

J1

ADP3303

CRYSTAL

12

J3

12

J4

12

J5

CLK1

EXTERNAL CLOCK

12

J6

ADR423

12

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)

AVDD2

AVDD1

USB

MICROCONTROLLER

Figure 1. AD5933 Evaluation Board Block Diagram