18 V, Precision, 725 µA, 4 MHz,
CMOS RRIO Operational Amplifier
ADA4661-2
Data Sheet
FEATURES
PIN CONNECTION DIAGRAMS
Low power at high voltage (18 V): 725 μA maximum
Low offset voltage
150 µV maximum at VSY/2
OUT A
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
V+
ADA4661-2
OUT B
–IN B
+IN B
TOP VIEW
(Not to Scale)
300 µV maximum over entire common-mode range
Low input bias current: 15 pA maximum
Gain bandwidth product: 4 MHz typical at AV = 100
Unity-gain crossover: 4 MHz typical
−3 dB closed-loop bandwidth: 2.1 MHz typical
Single-supply operation: 3 V to 18 V
Dual-supply operation: 1.5 V to 9 V
Unity-gain stable
Figure 1. 8-Lead MSOP
OUT A 1
8 V+
–IN A 2
+IN A 3
V– 4
7 OUT B
6 –IN B
5 +IN B
ADA4661-2
TOP VIEW
(Not to Scale)
NOTES
1. CONNECT THE EXPOSED PAD TO V– OR
LEAVE IT UNCONNECTED.
APPLICATIONS
Figure 2. 8-Lead LFCSP
Current shunt monitors
Active filters
Portable medical equipment
Buffer/level shifting
High impedance sensor interfaces
Battery powered instrumentation
250
200
150
100
50
V
= 18V
SY
0
–50
–100
–150
–200
–250
GENERAL DESCRIPTION
The ADA4661-2 is a dual, precision, rail-to-rail input/output
amplifier optimized for low power, high bandwidth, and wide
operating supply voltage range applications.
The ADA4661-2 performance is guaranteed at 3.0 V, 10 V,
and 18 V power supply voltages. It is an excellent selection for
applications that use single-ended supplies of 3.3 V, 5 V, 10 V, 12
V and 15 V, and dual supplies of 2.5 V, 3.3 V, and 5 V. It
uses the Analog Devices, Inc., patented DigiTrim® trimming
technique, which achieves low offset voltage. Additionally, the
unique design architecture of the ADA4661-2 allows it to have
excellent power supply rejection, common-mode rejection, and
offset voltage when operating in the common-mode voltage
range of −VSY + 1.5 V to +VSY − 1.5 V.
0
1.5 3.0 4.5 6.0 7.5 9.0 10.5 12.0 13.5 15.0 16.5 18.0
(V)
V
CM
Figure 3. Input Offset Voltage vs. Common-Mode Voltage
Table 1. Precision Low Power Op Amps (<1 mA)
Supply Voltage
5 V
12 V to 16 V 30 V
Single
ADA4505-1
AD8500
ADA4505-2
AD8502
AD8506
OP196
OP777
Dual
AD8657
OP296
ADA4661-2
ADA4666-2
AD8659
OP496
ADA4096-2
OP727
AD8682
AD8622
ADA4096-4
OP747
The ADA4661-2 is specified over the extended industrial
temperature range (−40°C to +125°C) and is available in
8-lead MSOP and 8-lead LFCSP (3 mm × 3 mm) packages.
Quad
ADA4505-4
AD8504
AD8508
AD8684
AD8624
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rightsof third parties that may result fromits use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks andregisteredtrademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Technical Support
©2013 Analog Devices, Inc. All rights reserved.
www.analog.com
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