30 V, Low Noise, Rail-to-Rail I/O,
Low Power Operational Amplifiers
ADA4084-2/ADA4084-4
Data Sheet
FEATURES
PIN CONFIGURATIONS
Rail-to-rail input/output
ADA4084-2
V+
OUT A
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
Low power: 0.625 mA typical per amplifier at 15 V
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
OUT B
–IN B
+IN B
TOP VIEW
(Not to Scale)
NOTES
1. FOR THE LFCSP PACKAGE THE
EXPOSED PAD MUST BE
CONNECTED TO V–.
High slew rate: 4.6 V/μs typical
Low noise: 3.9 nV/√Hz typical at 1 kHz
Figure 1. 8-Lead MSOP (RM), 8-Lead SOIC (R), 8-Lead LFCSP (CP)
APPLICATIONS
OUT A
1
2
OUT D
–IN D
14
13
Battery-powered instrumentation
High-side and low-side sensing
Power supply control and protection
Telecommunications
–IN A
+IN A
V+
+IN D
V–
3
4
12
11
ADA4084-4
DAC output amplifiers
ADC input buffers
+IN C
–IN C
OUT C
+IN B
–IN B
5
6
7
10
9
8
OUT B
GENERAL DESCRIPTION
Figure 2. 14-Lead TSSOP (RU)
The ADA4084-2 (dual) and ADA4084-4 (quad) are single-supply,
10 MHz bandwidth amplifiers featuring rail-to-rail inputs and
outputs. They are guaranteed to operate from 3 V to 30 V (or
1.ꢀ V to 1ꢀ 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 and ADA4084-4 useful in a wide variety of
applications, including filters and instrumentation.
–IN A
1
2
3
4
12 –IN D
+IN A
V+
ADA4084-4
11 +IN D
10 V–
TOP
VIEW
9
+IN C
+IN B
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.
NOTES
1. NIC = NOT INTERNALLY CONNECTED.
2. FOR THE LFCSP PACKAGE THE EXPOSED PAD
MUST BE CONNECTED TO V–.
Figure 3. 16-Lead LFCSP (CP)
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.
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 and ADA4084-4 are specified over the
industrial temperature range of −40°C to +12ꢀ°C. The dual
ADA4084-2 is available in the 8-lead SOIC, MSOP, and LFCSP
surface-mount packages, and the ADA4084-4 is offered in the
14-lead TSSOP and 16-lead LFCSP.
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
AD8674
2.8 nV/Hz Rail-to-Rail Output AD8675
AD8676
AD8672
The ADA4084-2 and ADA4084-4 are members of a growing
series of high voltage, low noise op amps offered by Analog
Devices, Inc., (see Table 1).
2.8 nV/Hz
3.2 nV/Hz
AD8671
OP27/OP37
3.9 nV/Hz Rail-to-Rail
Input/Output
ADA4084-2
ADA4084-4
Rev. D
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