Single-Supply, Low Cost
Instrumentation Amplifier
AD8223
Rev. 0
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FEATURES
Gain set with 1 resistor
Gain = 5 to 1000
Inputs
Voltage range to 150 mV below negative rail
25 nA maximum input bias current
30 nV/√Hz, RTI noise @ 1 kHz
Power supplies
Dual supply: ±2 V to ±12 V
Single supply: 3 V to 24 V
500 μA maximum supply current
APPLICATIONS
Low power medical instrumentation
Transducer interface
Thermocouple amplifiers
Industrial process controls
Difference amplifiers
Low power data acquisition
CONNECTION DIAGRAM
–R
G
1
–IN
2
+IN
3
–V
S
4
+R
G
8
+V
S
7
OUT
6
REF
5
–
+
AD8223
06925-001
Figure 1. 8-Lead SOIC (R) and 8-Lead MSOP (RM) Packages
Table 1. Instrumentation Amplifiers by Category
General-
Purpose Zero Drift
Mil
Grade
Low
Power
High Voltage
PGA
AD8220
1
AD8231
1
AD620 AD627
1
AD8250
AD8221 AD8553
1
AD621 AD623
1
AD8251
AD8222 AD8555
1
AD524 AD8223 AD8253
AD8224
1
AD8556
1
AD526
AD8228 AD8557
1
AD624
1
Rail-to-rail output.
GENERAL DESCRIPTION
The AD8223 is an integrated single-supply instrumentation
amplifier that delivers rail-to-rail output swing on a single
supply (3 V to 24 V). The AD8223 conforms to the 8-lead
industry standard pinout configuration.
The AD8223 is simple to use: one resistor sets the gain. With no
external resistor, the AD8223 is configured for G = 5. With an
external resistor, the AD8223 can be programmed for gains up
to 1000.
The AD8223 has a wide input common-mode range and can
amplify signals that have a 150 mV common-mode voltage
below ground. Although the design of the AD8223 is optimized
to operate from a single supply, the AD8223 still provides
excellent performance when operated from a dual voltage
supply (±2 V to ±12 V).
Low power consumption (1.5 mW at 3 V), wide supply voltage
range, and rail-to-rail output swing make the AD8223 ideal for
battery-powered applications. The rail-to-rail output stage
maximizes the dynamic range when operating from low supply
voltages. The AD8223 replaces discrete instrumentation
amplifier designs and offers superior linearity, temperature
stability, and reliability in a minimum of space.
