Precision Low Noise CMOS Rail-to-Rail

Input/Output Operational Amplifiers

AD8605/AD8606/AD8608

Rev. D

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FEATURES

Low offset voltage: 65 µV maximum

Low input bias currents: 1 pA maximum

Low noise: 8 nV/√Hz

Wide bandwidth: 10 MHz

High open-loop gain: 120 dB

Unity gain stable

Single-supply operation: 2.7 V to 5.5 V

MicroCSP™

GENERAL DESCRIPTION

The AD8605, AD8606, and AD86081 are single, dual, and quad

rail-to-rail input and output, single-supply amplifiers. They

feature very low offset voltage, low input voltage and current

noise, and wide signal bandwidth. They use Analog Devices’

patented DigiTrim® trimming technique, which achieves

superior precision without laser trimming.

The combination of low offsets, low noise, very low input bias

currents, and high speed makes these amplifiers useful in a

wide variety of applications. Filters, integrators, photodiode

amplifiers, and high impedance sensors all benefit from the

combination of performance features. Audio and other ac

applications benefit from the wide bandwidth and low

distortion. Applications for these amplifiers include optical

control loops, portable and loop-powered instrumentation,

and audio amplification for portable devices.

The AD8605, AD8606, and AD8608 are specified over the

extended industrial temperature range (−40°C to +125°C). The

AD8605 single is available in the 5-lead SOT-23 and 5-bump

MicroCSP packages. The 5-bump MicroCSP offers the smallest

available footprint for any surface-mount operational amplifier.

The AD8606 dual is available in an 8-lead MSOP package and a

narrow SOIC surface-mount package. The AD8608 quad is

available in a 14-lead TSSOP and a narrow 14-lead SOIC

package. MicroCSP, SOT, MSOP, and TSSOP versions are

available in tape and reel only.

APPLICATIONS

Photodiode amplification

Battery-powered instrumentation

Multipole filters

Sensors

Barcode scanners

Audio

FUNCTIONAL BLOCK DIAGRAMS

1

2

3

5

4 –IN

+IN

V+

OUT

AD8605

V–

1

2

3

4

8

7

6

5

AD8608

–IN A

V–

+IN A

OUT B

–IN B

V+

+IN B

OUT A

Figure 1. 5-Lead SOT-23 (RT Suffix)

Figure 2. 8-Lead SOIC (R Suffix)

AD8605 ONLY

OUT

V+

V–

+IN

–IN

1

3

5

4

2

TOP VIEW

(BUMP SIDE DOWN)

–IN A

+IN A

V+

+IN B

–IN B

OUT B

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

OUT A

AD8608

1

2

3

4

5

6

7

14

13

12

11

10

9

8

Figure 3. 5-Bump MicroCSP

(CB Suffix)

Figure 4. 14-Lead SOIC (R Suffix)

–IN A

+IN A

V–

OUT B

–IN B

+IN B

V+

18

AD8606

OUT A

45

OUT A

–IN A

+IN A

V+

+IN B

–IN B

OUT B

–IN D

+IN D

V–

OUT D

–IN C

OUT C

+IN C

14

8

1

7

AD8608

Figure 5. 8-Lead MSOP (RM Suffix)

Figure 6. 14-Lead TSSOP (RU Suffix)