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Zero Drift, Digitally Programmable
I nstrumentation          Amplifier Evaluation Board
AD8231-EVALZ
FEATURES
Two AD8231 circuits
In-amp and op amp
Differential output
Easy to switch jumpers
QUICK START
Set the jumpers as shown in Table 1. These jumper settings ensure
the part is enabled and in a gain of 1.
Table 1. Quick Start Jumper Settings
Decoupled supply lines
GENERAL DESCRIPTION
The AD8231-EVALZ has two AD8231s mounted on it. Z1 is the
AD8231 on the left side of the board. It is configured to allow
access of the in-amp and op amp separately. Z2 is the AD8231
Function
SDN
A2
A1
A0
CS
Setting
High
Low
Low
Low
Low
on the right side of the board. It is set up as a differential output
configuration.
Inputs, outputs, references, and the supplies are routed to test
points for easy connectivity. SDN, CS, and the gain select pins
(A0 to A2) are routed to jumpers. These jumpers control both
AD8231s. When a jumper is in the high position, its corresponding
pin is connected to VS. When the jumper is in the low position,
it is connected to ground.
The PCB has four layers. The top and bottom layers are used for
routing, and the two internal layers are power and ground planes.
EVALUATION BOARD
Connect the ground lead to GND and connect a 5 V supply to
+V S. Connect a 1 V source to –INA, and connect a 2 V source to
+INA. 3.5 V should now appear at OUTA.
The output equation for the AD8231 with a gain of 1 is
V +INA ? V ?INA + V REF = V OUT . As shipped, the evaluation board
has the in-amp reference pin driven to half the supply voltage.
Therefore, the output voltage is 2 V – 1 V + 2.5 V = 3.5 V.
DUAL SUPPLIES
The supplies on the AD8231-EVALZ are labeled VS and GND
because most applications are single supply. However, dual
supplies can also be used with this evaluation board, as long as
the difference between the two supplies is less than 6 V. Simply
connect the negative supply to the GND terminal. For example,
connect +2.5 V to +V S and ?2.5 V to GND. Any voltage connected
to GND also appears at the GND1, GND2, and GND3 terminals;
therefore, take care when connecting external equipment.
CONFIGURING THE OP AMP
By default, the op amp in Z1 is configured as a unity-gain buffer
driving the in-amp reference pin. A resistor divider at the op amp
input sets the voltage at midsupply. When using this op amp for
other applications, remove R8 and drive the in-amp REF pin
with a different source.
VS
Figure 1.
OP_IN
R10
0 ?
R7
10k ?
R13
0 ?
R8
0 ?
OP_OUT
REF
RC11
10k ?
R12
0 ?
Figure 2. Default Op Amp Configuration
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards are 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
Fax: 781.461.3113 ?2008 Analog Devices, Inc. All rights reserved.
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