1.8 V, Micropower, Zero-Drift,

Rail-to-Rail Input/Output Op Amp

ADA4051-2

Rev. 0

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FEATURES

Very low supply current: 13 μA

Low offset voltage: 15 μV maximum

Offset voltage drift: 20 nV/°C

Single-supply operation: 1.8 V to 5.5 V

High PSRR: 110 dB minimum

High CMRR: 110 dB minimum

Rail-to-rail input and output

Unity gain stable

Extended industrial temperature range

APPLICATIONS

Pressure and position sensors

Temperature measurements

Electronic scales

Medical instrumentation

Battery-powered equipment

Handheld test equipment

PIN CONFIGURATION

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

ADA4051-2

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead MSOP (RM-8)

GENERAL DESCRIPTION

The ADA4051-2 is a CMOS, micropower, zero-drift opera-

tional amplifier utilizing an innovative chopping technique.

This amplifier features rail-to-rail input and output swing and

extremely low offset voltage while operating from a 1.8 V to

5.5 V power supply. This amplifier also offers high PSRR and

CMRR, while operating with a supply current of only 13 μA per

amplifier. This combination of features makes the ADA4051-2

amplifier an ideal choice for battery-powered applications where

high precision as well as low power consumption is important.

The ADA4051-2 is specified for the extended industrial temper-

ature range of −40°C to +125°C. The ADA4051-2 amplifier is

available in the standard 8-pin MSOP.

The ADA4051-2 is a member of a growing series of zero-drift

op amps offered by Analog Devices, Inc. Refer to Table 1 for a

list of these devices.

Table 1. Op Amps

Supple

Low Power, 5 V

5 V

16 V

Single

AD8538

AD8628

AD8638

Dual

AD8539

AD8629

AD8639

Quad

AD8630