AD623-EVAL Datasheet, PDF (1/4 Pages) Analog Devices – Evaluation Board for the AD623

FEATURES
Accepts SOIC or PDIP packages
Configurable for dual or single supplies
Provision for optional circuitry
Shield driver
Adjustable offset/reference
GENERAL DESCRIPTION
The AD623-EVALZ is an easy-to-use accessory for evaluating
the AD623 instrumentation amplifier. In addition to the basic
in-amp connection, circuit options enable the user to adjust the
Evaluation Board for the AD623
AD623-EVALZ
offset voltage, apply an output reference, or provide shield
drivers with user-supplied components. The board is shipped
with a surface-mount package installed, and it has an alternative
footprint for a through-hole, 8-lead PDIP.
BASIC OPERATION
The AD623 converts a differential signal to a single-ended signal
with respect to a reference. User-supplied power supplies
connect +VS, –VS, and ground to pins of the AD623 on the
evaluation board. The differential signal is applied to the +IN
and –IN pins of the AD623, and the output is monitored at the
in-amp’s OUTPUT pin. Figure 2 shows the component layout
and location of connections.
GND2
+IN
FUNCTIONAL BLOCK DIAGRAM
REMOVE W3 AND W4 FOR AC COUPLING.
R2
100Ω
W3
W1
+GUARD
W2
–GUARD
–IN
GND1
C6
0.1µF
83
1 _{A2 2}
7
C5
0.1µF
5
A2 ₆
4
–V_AUX
R4
100Ω
W7
+V_S
+C12
10µF
25V
GND
W6
–V_S
C11
+ 10µF
25V
C1, 0.1µF
+V_AUX
W9
R3
100kΩ¹
W8
W10
W5
R5²
R6²
R_G
W15
C3, 0.1µF
R5
100kΩ¹
+V_S
A3
3
+
7
C4
0.1µF
8
+R_G
6
OUTPUT
1
2
–R_G REF ₅
–4
C2
0.1µF
–V_S
W14
W4
NOTES
1_{INSTALL FOR AC COUPLING ONLY.}
2_{TO USE GUARD DRIVER, INSTALL R5 AND R6}
2_{INSTEAD OF RG. R5 AND R6 = 0.5RG.}
+V_AUX
–V_AUX
Figure 1.
COMPONENTS IN SHADED AREAS
ARE USER SUPPLIED.
W12
OUTPUT
R8
W13
W11
EXT_REF
+V_AUX
C10
0.1µF
OFFSET ADJ.
73
6 _{A1 2}
4
R1
100kΩ
C9
0.1µF
–V_AUX
OP177
CS2
J500
240µA
OP177
CS2
J500
240µA
R9
5.9kΩ, 1%
R10
5.9kΩ, 1%
–V_AUX
C7
0.1µF
C8
0.1µF
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.
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