AD8233CB-EBZ User Guide

UG-1016

Rev. 0 | Page 3 of 12

EVALUATION BOARD HARDWARE

A simplified schematic is shown in Figure 2 of the AD8233CB-

EBZ evaluation board default configuration. See the Evaluation

Board Component Selection section for the full schematic. The

expected output signal is measured at the OUT terminal, shown in

Figure 3.

AD8233

GND

OUT

OPAMP–

REFOUT

OPAMP+

SW

REFIN

IAOUT

HPSENSE

HPDRIVE

+IN

–IN

RLD

RLDFB

FR

SDN

AC/DC

G = 100

LEADS-OFF

DETECTION

A1

A2

10kΩ

10kΩ

150kΩ

S1

S2

A3

A5

B5

C5

C4

D5

D4

D3

C3

D2

D1

C1

C2

B1

B2

B3

A1

A2

A3

B4

A4

IAOUT

HIGH PASS

TO OPAMP

STAGE

HIGH PASS

SECOND-ORDER LOW PASS AND GAIN

ELECTRODES

OPTIONAL

DRIVEN LEAD

ELECTRODE

LOD

RLD SDN

FR

SDN

AC/DC

VOUT

10MΩ

10MΩ

180kΩ

180kΩ

499kΩ

1nF

10MΩ

10MΩ

10MΩ

1MΩ

100kΩ

1MΩ

200kΩ

100kΩ

10nF

22nF

0.22µF

10µF

RLD SDN

C

Figure 2. AD8233CB-EBZ Default Configuration

0.5V/DIV

500ms/DIV

Figure 3. AD8233CB-EBZ Expected Output Signal

Measured at the OUT Terminal

QUICK START GUIDE

The AD8233CB-EBZ evaluation board ships with a default

configuration of a three-electrode system that connects to the

hands of a subject. For a three-electrode configuration, verify

the switches and jumpers are set to the default values shown in

Table 1. Various other configurations are shown in Table 2.

Table 1. Default Switch and Jumper Settings

Label

Position

Setting

S1

FR_DIS

Fast restore disabled

S2

DC

DC leads off detection

S3

EN

Operation enabled

S4

RLD_EN

RLD enabled

Input Bias Selection

P4, P6, P7

Three-electrode dc

REFIN Resistor Divider EN

P8, P9

Setup Procedure

Take the following steps to set up the AD8233CB-EBZ

evaluation board:

1. Connect a power supply common to the GND terminal on

the evaluation board. Connect a +3 V supply voltage at the

+VS terminal.

2. Connect the left arm (LA) terminal and the right arm (RA)

terminal to a signal source such as an ECG signal generator.

3. Connect the right leg (RL) terminal to a signal source such

as an ECG signal generator. The RLD is available via the

RL terminal.

4. Alternatively, connect a sensor cable (not included) to the

3.5 mm electrode jack and connect the electrodes to a

signal source such as an ECG signal generator.

5. The output signal is available on the OUT terminal. The

expected output signal is shown in Figure 3.

Precaution When Using the AD8233CB-EBZ

For safety reasons, Analog Devices recommends evaluating the

AD8233 with an ECG signal source instead of a live subject.

Although the LA, RA, and RL electrode terminals are equipped

with current-limiting resistors (R6 and R7), these resistors are not

a comprehensive patient protection system. The resistors may

not protect against supply line transients or leakage currents

coming through power and acquisition systems. The user is

fully responsible for understanding and applying all the safety

guidelines and regulations that apply to medical equipment.