Low Cost, Low Noise, CMOS Rail-to-Rail

Output Operational Amplifiers

AD8691/AD8692/AD8694

Rev. B

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© 2005 Analog Devices, Inc. All rights reserved.

FEATURES

Offset voltage: 400 µV typ

Low offset voltage drift: 6 µV/°C max (AD8692/AD8694)

Very low input bias currents: 1 pA max

Low noise: 8 nV/

√Hz

Low distortion: 0.0006%

Wide bandwidth: 10 MHz

Unity-gain stable

Single-supply operation: 2.7 V to 6 V

APPLICATIONS

Photodiode amplification

Battery-powered instrumentation

Medical instruments

Multipole filters

Sensors

Portable audio devices

PIN CONFIGURATIONS

V+

5

–IN

3

AD8691

TOP VIEW

(Not to Scale)

Figure 1. 5-Lead TSOT

V+

5

–IN

4

AD8691

Figure 2. 5-Lead SC70

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8692

TOP VIEW

(Not to Scale)

Figure 3. 8-Lead MSOP

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8692

TOP VIEW

(Not to Scale)

Figure 4. 8-Lead SOIC

OUT D

14

–IN D

13

+IN D

12

V–

11

+IN C

10

–IN C

9

OUT C

8

AD8694

TOP VIEW

(Not to Scale)

Figure 5. 14-Lead SOIC

1

2

3

4

5

6

7

AD8694

– 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 6. 14-Lead TSSOP

GENERAL DESCRIPTION

The AD8691, AD8692, and AD8694 are low cost, single, dual,

and quad rail-to-rail output, single-supply amplifiers featuring

low offset and input voltages, low current noise, and wide signal

bandwidth. The combination of low offset, low noise, very low

input bias currents, and high speed make these amplifiers useful

in a wide variety of applications. Filters, integrators, photodiode

amplifiers, and high impedance sensors all benefit from this

combination of performance features. Audio and other ac

applications benefit from the wide bandwidth and low

distortion of these devices.

Applications for these amplifiers include PA controls, laser

diode control loops, portable and loop-powered instrumentation,

audio amplification for portable devices, and ASIC input and

output amplifiers.

The small SC70 and TSOT package options for the AD8691

allow it to be placed next to sensors, thereby reducing external

noise pickup.

The AD8691, AD8692, and AD8694 are specified over the

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

AD8691 single is available in 5-lead SC70 and TSOT packages.

The AD8692 dual is available in 8-lead MSOP and narrow SOIC

surface-mount packages. The AD8694 quad is available in

14-lead TSSOP and narrow 14-lead SOIC packages.