30 V, Low Noise, Rail-to-Rail

I/O, Low Power Operational Amplifier

Data Sheet

ADA4084-2

Rev. C

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FEATURES

Rail-to-rail input/output

Low power: 625 µA typical

Unity-gain crossover: 9.9 MHz typical

−3 dB closed-loop bandwidth: 13.9 MHz typical at ±15 V

Low offset voltage: 100 μV maximum (SOIC)

Unity-gain stable

High slew rate: 4.6 V/μs typical

Low noise: 3.9 nV/√Hz typical at 1 kHz

APPLICATIONS

Battery-powered instrumentation

Power supply control and protection

Telecommunications

DAC output amplifier

ADC input buffer

GENERAL DESCRIPTION

The ADA4084-2 is a dual, single-supply, 10 MHz bandwidth

amplifier featuring rail-to-rail inputs and outputs. It is guaran-

teed to operate from 3 V to 30 V (or ±1.5 V to ±15 V).

These amplifiers are well suited for single-supply applications

requiring both ac and precision dc performance. The combina-

tion of wide bandwidth, low noise, and precision makes the

ADA4084-2 useful in a wide variety of applications, including

filters and instrumentation.

Other applications for these amplifiers include portable telecom-

munications equipment, power supply control and protection,

and use as amplifiers or buffers for transducers with wide output

ranges. Sensors requiring a rail-to-rail input amplifier include

Hall effect, piezoelectric, and resistive transducers.

The ability to swing rail-to-rail at both the input and output

enables designers to build multistage filters in single-supply

systems and to maintain high signal-to-noise ratios.

The ADA4084-2 is specified over the industrial temperature

range of −40°C to +125°C. The dual ADA4084-2 is available in

the 8-lead SOIC, MSOP, and LFCSP surface-mount packages.

PIN CONFIGURATION

1

2

3

4

8

7

6

5

OUT B

–IN B

+IN B

V+

OUT A

–IN A

+IN A

V–

ADA4084-2

TOP VIEW

(Not to Scale)

NOTES

1. FOR THE LFSCP PACKAGE THE

EXPOSED PAD MUST BE

CONNECTED TO V–.

Figure 1. 8-Lead MSOP (RM)

8-Lead SOIC (R)

8-Lead LFCSP (CP)

The ADA4084-2 is a member of a growing series of high voltage,

low noise op amps offered by Analog Devices, Inc., (see Table 1).

For a more complete selection table of low input voltage noise

amplifiers, see the AN-940 Application Note, Low Noise

Amplifier Selection Guide for Optimal Noise Performance,

available at www.analog.com.

Table 1. Low Noise Op Amps

Voltage Noise

Single

Dual

Quad

1.1 nV/Hz

AD8597

AD8599

1.8 nV/Hz

ADA4004-1

ADA4004-2

ADA4004-4

2.8 nV/Hz RRO1

AD8675

AD8676

2.8 nV/Hz

AD8671

AD8672

AD8674

3.2 nV/Hz

OP27/OP37

3.9 nV/Hz RRIO2

ADA4084-2

1

Rail-to-rail output.

2

Rail-to-rail input/output.