1.8 V, Micropower, Zero-Drift,

Rail-to-Rail Input/Output Op Amp

ADA4051-1/ADA4051-2

Rev. B

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FEATURES

Very low supply current: 13 μA typical

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/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

OUT

1

+IN

3

V–

2

V+

5

–IN

4

ADA4051-1

TOP VIEW

(Not to Scale)

Figure 1. 5-Lead SOT-23 (RJ-5)

+IN

1

–IN

3

V–

2

V+

5

OUT

4

ADA4051-1

TOP VIEW

(Not to Scale)

Figure 2. 5-Lead SC-70 (KS-5)

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

ADA4051-2

TOP VIEW

(Not to Scale)

Figure 3. 8-Lead MSOP (RM-8)

NOTES

1. IT IS RECOMMENDED THAT THE

EXPOSED PAD BE CONNECTED TO V–.

PIN 1

INDICATOR

1

OUT A

2

–IN A

3

+IN A

4

V–

7OUT B

8V+

6 –IN B

5 +IN B

TOP VIEW

(Not to Scale)

ADA4051-2

Figure 4. 8-Lead LFCSP (CP-8-2)

GENERAL DESCRIPTION

The ADA4051-1/ADA4051-2 are CMOS, micropower, zero-

drift operational amplifiers utilizing an innovative chopping

technique. These amplifiers feature rail-to-rail input/output

swing and extremely low offset voltage while operating from a

1.8 V to 5.5 V power supply. In addition, these amplifiers offer

high power supply rejection ratio (PSRR) and common-mode

rejection ratio (CMRR) while operating with a typical supply

current of 13 μA per amplifier. This combination of features

makes the ADA4051-1/ADA4051-2 amplifiers ideal choices for

battery-powered applications where high precision and low

power consumption are important.

The ADA4051-1/ADA4051-2 are specified for the extended

industrial temperature range of −40°C to +125°C. The ADA4051-1

amplifier is available in 5-lead SOT-23 and 5-lead SC-70 packages.

The ADA4051-2 amplifier is available in 8-lead MSOP and 8-lead

LFCSP packages.

The ADA4051-1/ADA4051-2 are members 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

Supply

Low Power, 5 V

5 V

16 V

Single

AD8538

AD8628

AD8638

Dual

AD8539

AD8629

AD8639

Quad

AD8630