Low Noise, Precision 16 V CMOS,

Rail-to-Rail Operational Amplifiers

Data Sheet

AD8661/AD8662/AD8664

Rev. E

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FEATURES

Low offset voltage: 100 µV maximum at V

S = 5 V

Low input bias current: 1 pA maximum

Single-supply operation: 5 V to 16 V

Low noise: 10 nV/√Hz

Wide bandwidth: 4 MHz

Unity-gain stable

Small package options

3 mm × 3 mm 8-lead LFCSP

8-lead MSOP and narrow SOIC

14-lead TSSOP and narrow SOIC

APPLICATIONS

Sensors

Medical equipment

Consumer audio

Photodiode amplification

ADC drivers

PIN CONFIGURATIONS

NIC 1

–IN

2

+IN

3

V–

4

NIC

8

V+

7

OUT

6

NIC

5

NIC = NO INTERNALCONNECTION

AD8661

TOP VIEW

(Not to Scale)

NOTES

1. NIC = NO INTERNAL CONNECTION.

2. CONNECT THE EXPOSED PAD TO V–.

3

+IN

4

V–

1

NIC

2

–IN

6 OUT

5 NIC

8 NIC

7 V+

AD8661

TOP VIEW

(Not to Scale)

Figure 1. AD8661, 8-Lead SOIC

(R-8)

Figure 2. AD8661, 8-Lead LFCSP

(CP-8-13)

OUT A

1

–IN A

2

+IN A

3

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8662

TOP VIEW

(Not to Scale)

OUT A

1

–IN A

2

+IN A

3

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8662

TOP VIEW

(Not to Scale)

Figure 3. AD8662, 8-Lead SOIC

(R-8)

Figure 4. AD8662, 8-Lead MSOP

(RM-8)

AD8664

TOP VIEW

(Not to Scale)

OUT A 1

–IN A 2

+IN A 3

V+

4

+IN B

5

OUT D

–IN D

+IN D

V–

14

13

12

11

10

–IN B

6

OUT B 7

–IN C

+IN C

OUT C

9

8

OUT A 1

–IN A 2

+IN A 3

V+

4

+IN B

5

OUT D

–IN D

+IN D

V–

14

13

12

11

10

–IN B

6

OUT B 7

–IN C

+IN C

OUT C

9

8

AD8664

TOP VIEW

(Not to Scale)

Figure 5. AD8664, 14-Lead SOIC

(R-14)

Figure 6. AD8664, 14-Lead TSSOP

(RU-14)

GENERAL DESCRIPTION

The AD8661/AD8662/AD86641 are rail-to-rail output, single-

supply amplifiers that use the Analog Devices, Inc., patented

DigiTrim® trimming technique to achieve low offset voltage.

The AD8661/AD8662/AD8664 series features extended

operating ranges, with supply voltages up to 16 V. It also

features low input bias current, wide signal bandwidth,

and low input voltage and current noise.

The combination of low offset, very low input bias current,

and a wide supply range makes these amplifiers useful in a wide

variety of applications usually associated with higher priced JFET

amplifiers. Systems using high impedance sensors, such as

photodiodes, benefit from the combination of low input bias

current, low noise, low offset, and wide bandwidth. The wide

operating voltage range meets the demands of high performance

analog-to-digital converters (ADCs) and digital-to-analog

converters (DACs). Audio applications and medical monitoring

equipment can take advantage of the high input impedance, low

voltage, low current noise, and wide bandwidth.

The single AD8661 is available in a narrow 8-lead SOIC package

and a very thin, dual lead, 8-lead LFCSP. The AD8661 SOIC

package is specified over the extended industrial temperature

range of −40°C to +125°C. The AD8661 LFCSP is specified over

the industrial temperature range of −40°C to +85°C. The AD8662

is available in a narrow 8-lead SOIC package and an 8-lead MSOP,

both specified over the extended industrial temperature range of

−40°C to +125°C. The AD8664 is available in a narrow 14-lead

SOIC package and a 14-lead TSSOP, both with an extended

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

1 Protected by U.S. Patents 6,194,962 and 6,696,894.