30 V, Low Noise, Rail-to-Rail
I/O, Low Power Operational Amplifier
ADA4084-2
Data Sheet
FEATURES
PIN CONFIGURATIONS
Rail-to-rail input/output
Low power: 625 µA typical
ADA4084-2
V+
OUT A
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
OUT B
–IN B
+IN B
Gain bandwidth product: 15.9 MHz at AV =100 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
TOP VIEW
(Not to Scale)
Figure 1. 8-Lead MSOP (RM)
8-Lead SOIC (R)
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
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).
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).
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.
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.
Table 1. Low Noise Op Amps
Voltage Noise
Single
Dual
Quad
1.1 nV/Hz
1.8 nV/Hz
2.8 nV/Hz RRO1
2.8 nV/Hz
AD8597
ADA4004-1
AD8675
AD8599
ADA4004-2
AD8676
AD8672
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.
ADA4004-4
AD8674
AD8671
3.2 nV/Hz
3.9 nV/Hz RRIO2
OP27/OP37
ADA4084-2
1 Rail-to-rail output.
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.
2 Rail-to-rail input/output.
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 and MSOP surface-mount packages.
Rev. A
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