Zero-Drift, Single-Supply, Rail-to-Rail

Input/Output Operational Amplifiers

Data Sheet

AD8571/AD8572/AD8574

Rev. F

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FEATURES

Low offset voltage: 1 μV

Input offset drift: 0.005 μV/°C

Rail-to-rail input and output swing

5 V/2.7 V single-supply operation

High gain: 145 dB typical

CMRR: 140 dB typical

PSRR: 130 dB typical

Ultralow input bias current: 10 pA typical

Low supply current: 750 μA per op amp

Overload recovery time: 50 μs

No external capacitors required

APPLICATIONS

Temperature sensors

Pressure sensors

Precision current sensing

Strain gage amplifiers

Medical instrumentation

Thermocouple amplifiers

GENERAL DESCRIPTION

This family of amplifiers has ultralow offset, drift, and bias

current. The AD8571/AD8572/AD85741 are single, dual, and

quad amplifiers, respectively, featuring rail-to-rail input and

output swings. All are guaranteed to operate from 2.7 V to 5 V

single supply.

The AD8571/AD8572/AD8574 provide benefits previously

found only in expensive auto-zeroing or chopper-stabilized

amplifiers. Using Analog Devices, Inc., topology, these zero-

drift amplifiers combine low cost with high accuracy. (No

external capacitors are required.) Using a spread-spectrum,

auto-zero technique, the AD8571/AD8572/AD8574 eliminate

the intermodulation effects from interaction of the chopping

function with the signal frequency in ac applications.

With an offset voltage of only 1 μV and drift of 0.005 μV/°C, the

AD8571/AD8572/AD8574 are perfectly suited for applications

where error sources cannot be tolerated. Position and pressure

sensors, medical equipment, and strain gage amplifiers benefit

greatly from nearly zero drift over their operating temperature

range. Many more systems require the rail-to-rail input and

output swings provided by the AD8571/AD8572/AD8574.

1 Protected by U.S. Patent 6,130,578.

PIN CONFIGURATIONS

V+

OUT A

NC

NC

NC = NO CONNECT

–IN A

+IN A

V–

NC

8

7

6

5

1

2

3

4

AD8571

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead MSOP (RM Suffix)

NC = NO CONNECT

AD8571

TOP VIEW

(Not to Scale)

NC

1

–IN A 2

+IN A 3

V–

4

NC

V+

OUT A

NC

8

7

6

5

Figure 2. 8-Lead SOIC (R Suffix)

–IN A

+IN A

V–

OUT B

–IN B

+IN B

OUT A

V+

1

2

3

4

8

7

6

5

AD8572

TOP VIEW

(Not to Scale)

Figure 3. 8-Lead TSSOP (RU Suffix)

–IN A

+IN A

V–

OUT B

–IN B

+IN B

OUT A

V+

1

2

3

4

8

7

6

5

AD8572

TOP VIEW

(Not to Scale)

Figure 4. 8-Lead SOIC (R Suffix)

OUT A 1

–IN A 2

+IN A 3

V+

4

+IN B

5

OUT D

–IN D

+IN D

V–

+IN C

14

13

12

11

10

–IN B 6

OUT B 7

–IN C

OUT C

9

8

AD8574

TOP VIEW

(Not to Scale)

Figure 5. 14-Lead TSSOP (RU Suffix)

OUT A 1

–IN A 2

+IN A 3

V+

4

+IN B

5

OUT D

–IN D

+IN D

V–

+IN C

14

13

12

11

10

–IN B 6

OUT B 7

–IN C

OUT C

9

8

AD8574

TOP VIEW

(Not to Scale)

Figure 6. 14-Lead SOIC (R Suffix)

The AD8571/AD8572/AD8574 are specified for the extended

industrial/ automotive temperature range (−40°C to +125°C).

The AD8571 single amplifier is available in 8-lead MSOP and

narrow SOIC packages. The AD8572 dual amplifier is available in

8-lead narrow SOIC and surface-mount TSSOP packages. The

AD8574 quad amplifier is available in 14-lead narrow SOIC and

TSSOP packages.