Analog Devices AD8224-EVALZ Manuel utilisateur

Precision Instrumentation Amplifier

Evaluation Board

AD8224-EVALZ

Rev. 0

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

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

Evaluation boards are not authorized to be used in life support devices or systems.

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

Tel: 781.329.4700 www.analog.com

FEATURES

Two AD8224 circuits

Dual channel

Differential output

Easy to connect screw terminals

Decoupled supply lines

Pads for RFI filtering

GENERAL DESCRIPTION

The AD8224-EVALZ has two AD8224 instrumentation

amplifier circuits: one circuit is configured for dual-channel

operation, and the other is configured for single-channel,

differential output operation. The inputs, outputs, references,

and supplies are routed to screw terminals for easy connectivity.

The PCB board has four layers. The top and bottom layers are

used for routing, and the two internal layers are ground planes.

The ground plane was removed underneath the RGresistors.

This is a precaution against any capacitance mismatch at the

RGx pins that may affect ac CMRR.

AD8224 EVALUATION BOARD

06687-003

Figure 1.

AD8224-EVALZ

Rev. 0 | Page 2 of 4

EVALUATION BOARD HARDWARE

JUMPER SETTINGS

Table 1.

Jumper Purpose Default

J1A, J1B, J11 Connect inputs together Unconnected

J2A, J2B, J12, J13 Connect reference pins

to ground

Connected

In the default factory setting, the reference pins of the AD8224

are connected to GND through J2A, J2B, J12, and J13. These

jumpers also connect to W2A:REF1, W2B:REF2, W13:REF2, and

W13:+IN2. Therefore, in the shipping configuration, W2A:REF1,

W2B:REF2, W13:REF2, and W13:+IN2 are connected to GND.

To disconnect the terminal from GND, remove the correspond-

ing jumper.

QUICK START

The quick start feature assumes that the jumpers are in their

default factory positions.

To begin:

1. Connect a ground lead to GND.

2. Connect a +15 V supply to +VS.

3. Connect a −15 V supply to −Vs.

4. Ground −IN1.

5. Connect a 1 V p-p, 1 kHz source signal to +IN1. A replica

of the signal should now appear at OUT1.

SETTING THE GAIN

The gain setting resistors are R1A and R1B for the dual-channel

part and R11A for the differential output part. The pads are

sized for 0603-sized resistors, although 0402 and 0805 sizes can

also be used.

Table 2.

Channel Component

Dual Channel A R1A

Dual Channel B R1B

Differential Output Channel R11A

EMI FILTERING

The board comes with 0603 component pads for an EMI filter.

These components are shown in Table 3 .

Table 3.

Channel Component

Dual Channel A R3A, R2A, C1A, C2A, C3A

Dual Channel B R3B, R2B, C1B, C2B, C3B

Differential Output Channel R13, R12, C11, C12, C13

The board, as shipped, does not contain EMI filtering. The

resistors pads are populated with 0 Ω resistors, and the

capacitors are not populated.

See the AD8224 data sheet for more information on EMI

filtering.

AD8224-EVALZ

Rev. 0 | Page 3 of 4

EVALUATION BOARD SCHEMATICS

–V

OUT1 OUT2

REF1 REF2

REF_A

REF_B

W2A

J2A J2B

W2B

–IN1

+IN1

–IN2

+IN2

W1A

J1A

AD8224

DUAL

*NOT POPULATED

R3A

0Ω

C2A*

C3A*

R1A*

C1A*

0.1µF

R2A

0Ω

REF_A REF_B

R2B

0Ω

C2B*

R1B*

C3B*

C1B*

R3B

0Ω

J1B

W1B

0.1µF

06687-001

13141516

5 6 7 8

Figure 2. AD8224 Evaluation Board Schematic—AD8224 Dual Channel

W6 W5

AD8224

DIFF OUT

W13

J12

J13

GND1 GND2 GND3 GND4

–V

10µF

–V

R11B*

C15

0.1µF

13141516

5 6 7 8

–IN1

+IN1

+IN2

REF2

W11

J11

–V

R11A*

R13

0Ω

C12*

C13*

C11*

C14

0.1µF

R12

0Ω

–

OUT

+OUT

W12

C10

100pF

R10

10kΩ

*NOT POPULATED

06687-002

Figure 3. AD8224 Evaluation Board Schematic—AD8224 Differential Output

AD8224-EVALZ

Rev. 0 | Page 4 of 4

ORDERING INFORMATION

ORDERING GUIDE

Model Description

AD8224-EVALZ1Evaluation Board

1Z = RoHS Compliant Part.

ESD CAUTION

registered trademarks are the property of their respective owners.

EB06687-0-3/07(0)

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