Single Supply, Rail-to-Rail, Low Cost

Instrumentation Amplifier

Preliminary Technical Data

AD8223

Rev.

PrA

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FEATURES

Gain set with 1 resistor per amplifier

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: ±2.5V to ±12.5

Single supply: 3V to 25V

600 μA maximum supply current

CONNECTION DIAGRAM

1

–IN

2

+IN

3

4

8

7

OUTPUT

6

REF

5

–

+

AD8223

Figure 1. 8-Lead SOIC (R) and 8-Lead MSOP SOIC (RM) Packages

APPLICATIONS

Low power medical instrumentation

Transducer interface

Thermocouple amplifiers

Industrial process controls

Difference amplifiers

Low power data acquisition

GENERAL DESCRIPTION

The AD8223 is an integrated single-supply instrumentation

amplifier that delivers rail-to-rail output swing on a single

supply (+3.0 V to +25 V supplies). The AD8223 offers superior

user flexibility by allowing single-gain set resistor program-

ming, and conforming to the 8-lead industry standard pinout

configuration.

With no external resistor, the AD8223 is configured for G = 5

and with an external resistor, the AD8223 can be programmed

for gains up to 1000.

The AD8223 holds errors to a minimum by providing superior

ac CMRR that increases with increasing gain. Line noise, as

well as line harmonics, is rejected because the CMRR remains

constant up to 200 Hz. The AD8223 has a wide input common-

mode range and can amplify signals that have a common-mode

voltage 150 mV below ground. Although the design of the AD8223

is optimized to operate from a single supply, the AD8223 still

provides superior performance when operated from a dual

voltage supply (±2.5 V to ±12.5 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.