Precision Micropower, Low Noise CMOS

Rail-to-Rail Input/Output Operational

Amplifiers

AD8603/AD8607/AD8609

Rev. B

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FEATURES

Low offset voltage: 50 μV max

Low input bias current: 1 pA max

Single-supply operation: 1.8 V to 5 V

Low noise: 22 nV/√Hz

Micropower: 50 μA max

Low distortion

No phase reversal

Unity gain stable

APPLICATIONS

Battery-powered instrumentation

Multipole filters

Sensors

Low power ASIC input or output amplifiers

GENERAL DESCRIPTION

The AD8603/AD8607/AD8609 are single/dual/quad micro-

power rail-to-rail input and output amplifiers, respectively, that

feature very low offset voltage as well as low input voltage and

current noise.

These amplifiers use a patented trimming technique that

achieves superior precision without laser trimming. The parts

are fully specified to operate from 1.8 V to 5.0 V single supply

or from ±0.9 V to ±2.5 V dual supply. The combination of low

offsets, low noise, very low input bias currents, and low power

consumption make the AD8603/AD8607/AD8609 especially

useful in portable and loop-powered instrumentation.

The ability to swing rail-to-rail at both the input and output

enables designers to buffer CMOS ADCs, DACs, ASICs, and

other wide output swing devices in low power, single-supply

systems.

The AD8603 is available in a tiny 5-lead TSOT-23 package.

The AD8607 is available in 8-lead MSOP and 8-lead SOIC

packages. The AD8609 is available in 14-lead TSSOP and

14-lead SOIC packages.

PIN CONFIGURATIONS

OUT

1

V–

2

+IN

3

V+

5

–IN

4

AD8603

TOP VIEW

(Not to Scale)

Figure 1. 5-Lead TSOT-23 (UJ Suffix)

OUT A

1

–IN A

2

+IN A

3

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8607

TOP VIEW

(Not to Scale)

Figure 2. 8-Lead MSOP (RM Suffix)

OUT A

1

–IN A

2

+IN A

3

V

–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8607

TOP VIEW

(Not to Scale)

Figure 3. 8-Lead SOIC_N (R Suffix)

1

2

3

4

5

6

7

AD8609

–

IN A

+IN A

V+

OUT B

–IN B

+IN B

OUT A

14

13

12

11

10

9

8

–IN D

+IN D

V–

OUT C

–IN C

+IN C

OUT D

TOP VIEW

(Not to Scale)

Figure 4. 14-Lead TSSOP (RU Suffix)

OUT A

1

–IN A

2

+IN A

3

V+

4

OUT D

14

–IN D

13

+IN D

12

V–

11

+IN B

5

+IN C

10

–IN B

6

–IN C

9

OUT B

7

OUT C

8

AD8609

TOP VIEW

(Not to Scale)

Figure 5. 14-Lead SOIC_N (R Suffix)