16 V, 4 MHz Rail-to-Rail

Output Amplifiers

AD8665/AD8666/AD8668

Rev. A

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FEATURES

Offset voltage: 2.5 mV max

Low input bias current: 1 pA max

Single-supply operation: 5 V to 16 V

Dual-supply operation: ±2.5 V to ±8 V

Low noise: 8 nV/√Hz @ 10 kHz

Wide bandwidth: 4 MHz

Rail-to-rail output

Unity-gain stable

Lead-free packaging

APPLICATIONS

Sensor amplification

Reference buffers

Medical equipment

Physiological measurements

Signal filters and conditioning

Consumer audio

Photodiode amplification

ADC driver

Level shifting circuits

GENERAL DESCRIPTION

The AD866x family are single supply, rail-to-rail output

amplifiers with low noise performance featuring an extended

operating range with supply voltages up to 16 V. They also

feature low input bias currents, wide signal bandwidth, and low

input voltage and current noise. For lower offset voltage, choose

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

and wide supply range make these amplifiers useful in a wide

variety of cost sensitive applications normally associated with

much higher priced JFET amplifiers. Systems using high

impedance sensors, such as photo diodes, benefit from the

combination of low input bias current, low noise, and low offset

and bandwidth. The wide operating voltage range matches high

performance ADCs and DACs. Audio applications and medical

monitoring equipment can take advantage of the high input

impedance, low voltage and current noise, wide bandwidth, and

the lack of popcorn noise found in many other low input bias

current amplifiers.

The AD866x family is specified over the extended industrial

temperature range (−40°C to +125°C).

PIN CONFIGURATIONS

1

2

3

5

4

–IN

+IN

V+

OUT

AD8665

TOP VIEW

(Not to Scale)

V–

Figure 1. AD8665, 5-Lead SOT-23 (RJ-5)

NC

1

–IN

2

+IN

3

VEE

4

NC

8

VCC

7

OUT

6

NC

5

AD8665

TOP VIEW

(Not to Scale)

NC = NO CONNECT

Figure 2. AD8665, 8-Lead SOIC_N (R-8)

OUT A

1

–IN A

2

+IN A

3

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8666

TOP VIEW

(Not to Scale)

Figure 3. AD8666, 8-Lead SOIC_N (R-8)

OUT A

1

–IN A

2

+IN A

3

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8666

TOP VIEW

(Not to Scale)

Figure 4. AD8666, 8-Lead MSOP (RM-8)

1

2

3

4

5

6

7

AD8668

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 5. AD8668, 14-Lead TSSOP (RU-14)

OUT A

–IN A

+IN A

V+

OUT D

–IN D

+IN D

V–

+INB

+INC

–IN B

OUT B

–IN C

OUT C

AD8648

TOP VIEW

(Not to Scale)

OUT A

AD8668

TOP VIEW

(Not to Scale)

AD8648

TOP VIEW

(Not to Scale)

6

1

2

3

4

5

7

14

13

12

11

10

9

8

AD8668

TOP VIEW

(Not to Scale)

Figure 6. AD8668, 14-Lead SOIC_N (R-14)