Micropower, Single- and Dual-Supply,

Rail-to-Rail Instrumentation Amplifier

Data Sheet

AD627

Rev. E

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FEATURES

Micropower, 85 μA maximum supply current

Wide power supply range (+2.2 V to ±18 V)

Easy to use

Gain set with one external resistor

Gain range 5 (no resistor) to 1000

Higher performance than discrete designs

Rail-to-rail output swing

High accuracy dc performance

0.03% typical gain accuracy (G = +5) (AD627A)

10 ppm/°C typical gain drift (G = +5)

125 μV maximum input offset voltage (AD627B dual supply)

200 μV maximum input offset voltage (AD627A dual supply)

1 μV/°C maximum input offset voltage drift (AD627B)

3 μV/°C maximum input offset voltage drift (AD627A)

10 nA maximum input bias current

Noise: 38 nV/√Hz RTI noise at 1 kHz (G = +100)

Excellent ac specifications

AD627A: 77 dB minimum CMRR (G = +5)

AD627B: 83 dB minimum CMRR (G = +5)

80 kHz bandwidth (G = +5)

135 μs settling time to 0.01% (G = +5, 5 V step)

APPLICATIONS

4 mA to 20 mA loop-powered applications

Low power medical instrumentation—ECG, EEG

Transducer interfacing

Thermocouple amplifiers

Industrial process controls

Low power data acquisition

Portable battery-powered instruments

FUNCTIONAL BLOCK DIAGRAM

AD627

1

2

3

4

–IN

+IN

OUTPUT

REF

8

7

6

5

Figure 1. 8-Lead PDIP (N) and SOIC_N (R)

TRADITIONAL

LOW POWER

DISCRETE DESIGN

AD627

100

90

80

70

60

50

40

30

20

10

0

1

10

100

FREQUENCY (Hz)

1k

10k

GENERAL DESCRIPTION

The AD627 is an integrated, micropower instrumentation

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

dual (+2.2 V to ±18 V) supplies. The AD627 provides excellent

ac and dc specifications while operating at only 85 μA maximum.

The AD627 offers superior flexibility by allowing the user to set

the gain of the device with a single external resistor while con-

forming to the 8-lead industry-standard pinout configuration.

With no external resistor, the AD627 is configured for a gain of 5.

With an external resistor, it can be set to a gain of up to 1000.

A wide supply voltage range (+2.2 V to ±18 V) and micropower

current consumption make the AD627 a perfect fit for a wide

range of applications. Single-supply operation, low power

consumption, and rail-to-rail output swing make the AD627

ideal for battery-powered applications. Its rail-to-rail output

stage maximizes dynamic range when operating from low

supply voltages. Dual-supply operation (±15 V) and low power

consumption make the AD627 ideal for industrial applications,

including 4 mA to 20 mA loop-powered systems.

The AD627 does not compromise performance, unlike other

micropower instrumentation amplifiers. Low voltage offset,

offset drift, gain error, and gain drift minimize errors in the

system. The AD627 also minimizes errors over frequency by

providing excellent CMRR over frequency. Because the CMRR

remains high up to 200 Hz, line noise and line harmonics are

rejected.

The AD627 provides superior performance, uses less circuit

board area, and costs less than micropower discrete designs.