Single-Supply, Low Cost
Instrumentation Amplifier
AD8223
FEATURES CONNECTION DIAGRAM
Gain set with 1 resistor
R 1 8 +R
G G
Gain = 5 to 1000
IN 2 7 +V
S
Inputs
+IN 3 6 OUT
+
Voltage range to 150 mV below negative rail
V 4 5 REF
S
25 nA maximum input bias current AD8223
30 nV/Hz, RTI noise @ 1 kHz
Figure 1. 8-Lead SOIC (R) and 8-Lead MSOP (RM) Packages
Power supplies
Dual supply: 2 V to 12 V Table 1. Instrumentation Amplifiers by Category
Single supply: 3 V to 24 V General- Mil Low High Voltage
Purpose Zero Drift Grade Power PGA
500 A maximum supply current
1 1 1
AD8220 AD8231 AD620 AD627 AD8250
APPLICATIONS 1 1
AD8221 AD8553 AD621 AD623 AD8251
1
AD8222 AD8555 AD524 AD8223 AD8253
Low power medical instrumentation
1 1
AD8224 AD8556 AD526
Transducer interface
1
AD8228 AD8557 AD624
Thermocouple amplifiers
Industrial process controls
1
Rail-to-rail output.
Difference amplifiers
Low power data acquisition
GENERAL DESCRIPTION
to operate from a single supply, the AD8223 still provides
The AD8223 is an integrated single-supply instrumentation
excellent performance when operated from a dual voltage
amplifier that delivers rail-to-rail output swing on a single
supply (2 V to 12 V).
supply (3 V to 24 V). The AD8223 conforms to the 8-lead
industry standard pinout configuration.
Low power consumption (1.5 mW at 3 V), wide supply voltage
range, and rail-to-rail output swing make the AD8223 ideal for
The AD8223 is simple to use: one resistor sets the gain. With no
battery-powered applications. The rail-to-rail output stage
external resistor, the AD8223 is configured for G = 5. With an
maximizes the dynamic range when operating from low supply
external resistor, the AD8223 can be programmed for gains up
voltages. The AD8223 replaces discrete instrumentation
to 1000.
amplifier designs and offers superior linearity, temperature
The AD8223 has a wide input common-mode range and can
stability, and reliability in a minimum of space.
amplify signals that have a 150 mV common-mode voltage
below ground. Although the design of the AD8223 is optimized
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
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Fax: 781.461.3113 2008 Analog Devices, Inc. All rights reserved.
Trademarks and registered trademarks are the property of their respective owners.
06925-001AD8223
TABLE OF CONTENTS
Features .............................................................................................. 1 Gain Selection ............................................................................. 14
Applications ....................................................................................... 1 Input Voltage Range ................................................................... 14
Connection Diagram ....................................................................... 1 Reference Terminal .................................................................... 15
General Description ......................................................................... 1 Input Protection ......................................................................... 15
Revision History ............................................................................... 2 RF Interference (RFI) ................................................................. 15
Specif icat ions ..................................................................................... 3 Ground Returns for Input Bias Currents ................................ 16
Single Supply ................................................................................. 3 Applications Information .............................................................. 17
Dual Supply ................................................................................... 5 Basic Connection ....................................................................... 17
Absolute Maximum Ratings ............................................................ 7 Differential Output .................................................................... 17
Thermal Resistance ...................................................................... 7 Output Buffering ........................................................................ 17
ESD Caution .................................................................................. 7 Cables ........................................................................................... 17
Pin Configuration and Function Descriptions ............................. 8 A Single-Supply Data Acquisition System .............................. 18
Typical Performance Characteristics ............................................. 9 Amplifying Signals with Low Common-Mode Voltage ........ 18
Theory of Operation ...................................................................... 14 Outline Dimensions ....................................................................... 19
Amplifier Architecture .............................................................. 14 Ordering Guide .......................................................................... 20
REVISION HISTORY
10/08Revision 0: Initial Version
Rev. 0 | Page 2 of 20