Analog Devices AD8222-EVALZ Manuale utente

Precision Instrumentation Amplifier

Evaluation Board

AD8222-EVALZ

Rev. 0

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. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

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

Tel: 781.329.4700 www.analog.com

FEATURES

Two AD8222 circuits

Dual channel

Differential out

Easy to connect screw terminals

Decoupled supply lines

Pads for RFI filtering

GENERAL DESCRIPTION

The AD8222-EVALZ has two AD8222 instrumentation

amplifier circuits: one circuit is configured for dual-channel

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

differential output operation. Inputs, outputs, references, and

the 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

two RGpins, which may affect ac CMRR.

JUMPER SETTINGS

Table 1.

Jumpers 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 AD8222

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

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

corresponding jumper.

QUICK START

The quick start feature assumes that the jumpers are in their

factory default positions.

To begin:

•Connect ground lead to GND.

•Connect a 15 V supply to +VS.

•Connect a −15 V supply to −Vs.

•Ground −IN1.

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

the signal should now appear at OUT1.

6386-001

Figure 1. AD8222-EVALZ Evaluation Board Photo

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.

EMI FILTERING

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

These components are shown in Table 2.

Table 2.

Channel Components

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 AD8222 data sheet for more information on EMI

filtering.

AD8222-EVALZ

Rev. 0 | Page 2 of 2

06386-002

GND1 GND2 GND3 GND4

+V –V

W5W6

10µF

16 14 13

–V

678

–IN

+IN 10

C15

0.1µF

W11

R10

10kΩ

C10

100pF

R11

SPARE

R13

0Ω

R12

0Ω

J11

C11

SPARE

C12

SPARE

C13

SPARE

R11A

SPARE

AD8222

DIFF OUT

W12

–OUT+OUT

W13

+IN2

REF2

J13

–V

J12

C14

0.1µF

16 14 13

–V

678

–IN1

+IN1

W1A

R2B

0Ω

R3B

0Ω

R1B

SPARE

W1B

C3A

SPARE

C2A

SPARE

J1A

C1A

SPARE

R1A

SPARE

AD8222

DUAL

R3A

0Ω

R2A

0Ω

REF_A

+V REF_B

0.1µF

C3B

SPARE

C2B

SPARE

C1B

SPARE

J1B

–IN2

+IN2

J2A J2B

REF_A

REF_B

W2BW2A

REF1 OUT1 REF2OUT2

0.1µF +V

–V

Figure 2. AD8222-EVALZ Evaluation Board Schematic

ESD CAUTION

ORDERING GUIDE

Model Description

AD8222-EVALZ1Evaluation Board

1Z = Pb-free part.

registered trademarks are the property of their respective owners.

EB06386-0-11/06(0)

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