Precision, Very Low Noise, Low Input

Bias Current Operational Amplifiers

Data Sheet

AD8671/AD8672/AD8674

Rev. F

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FEATURES

Very low noise: 2.8 nV/√Hz, 77 nV p-p

Wide bandwidth: 10 MHz

Low input bias current: 12 nA max

Low offset voltage: 75 μV max

High open-loop gain: 120 dB min

Low supply current: 3 mA typ per amplifier

Dual-supply operation: ±5 V to ±15 V

Unity-gain stable

No phase reversal

APPLICATIONS

PLL filters

Filters for GPS

Instrumentation

Sensors and controls

Professional quality audio

GENERAL DESCRIPTION

The AD8671/AD8672/AD8674 are very high precision amplifiers

featuring very low noise, very low offset voltage and drift, low

input bias current, 10 MHz bandwidth, and low power

consumption. Outputs are stable with capacitive loads of over

1000 pF. Supply current is less than 3 mA per amplifier at 30 V.

The AD8671/AD8672/AD8674’s combination of ultralow noise,

high precision, speed, and stability is unmatched. The MSOP

version of the AD8671/AD8672 requires only half the board

space of comparable amplifiers.

Applications for these amplifiers include high quality PLL

filters, precision filters, medical and analytical instrumentation,

precision power supply controls, ATE, data acquisition, and

precision controls as well as professional quality audio.

The AD8671/AD8672 are specified over the extended industrial

temperature range (−40°C to +125°C), and the AD8674 is specified

over the industrial temperature range (−40°C to +85°C).

The AD8671/AD8672 are available in the 8-lead SOIC and

8-lead MSOP packages. The AD8674 is available in 14-lead

SOIC and 14-lead TSSOP packages.

Surface-mount devices in MSOP packages are available in tape

and reel only.

PIN CONFIGURATIONS

NC = NO CONNECT

NC

1

–IN

2

+IN

3

V–

4

NC

V+

OUT

NC

8

7

6

5

AD8671

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead SOIC_N (R-8) and 8-Lead MSOP (RM-8)

OUT A

1

–IN A

2

+IN A

3

V–

4

V+

OUT B

–IN B

+IN B

8

7

6

5

AD8672

TOP VIEW

(Not to Scale)

Figure 2. 8-Lead SOIC-N (R-8) and 8-Lead MSOP (RM-8)

OUT A

1

–IN A

2

+IN A

3

V+

4

+IN B

5

–IN B

6

OUT B

7

OUT D

–IN D

+IN D

V–

14

13

12

11

+IN C

–IN C

OUT C

10

9

8

AD8674

TOP VIEW

(Not to Scale)

Figure 3. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)

The AD8671, AD8672, and AD8674 are members of a growing

series of low noise op amps offered by Analog Devices, Inc.

Table 1. Voltage Noise

Package

0.9 nV

1.1 nV

1.8 nV

2.8 nV

3.8 nV

Single

AD797

AD8597

ADA4004-1

AD8675

AD8671

Dual

AD8599

ADA4004-2

AD8676

AD8672

Quad

ADA4004-4

AD8674