Wideband, Unity-Gain Stable,
Fast Settling Op Amp
Data Sheet
AD841
FEATURES CONNECTION DIAGRAMS
AC performance
NC 1 14 NC
Unity-gain bandwidth: 40 MHz NC 2 AD841 13 NC
BALANCE 3 12 BALANCE
Fast settling time: 110 ns to 0.01%
INPUT 4 11 +V
S
Slew rate: 300 V/s
+INPUT 5 10 OUTPUT
Full power bandwidth: 4.7 MHz for 20 V p-p into a 500 load
V 6 9 NC
S
TOP VIEW
DC performance
(Not to Scale)
NC 7 8 NC
Input offset voltage: 1 mV maximum
NOTES
Input voltage noise: 15 nV/Hz typical
1. NC = NO CONNECT.
Open-loop gain: 45 V/mV into a 1 k load
Figure 1. PDIP (N-14) Package and CERDIP (Q-14) Package
Output current: 50 mA minimum
Supply current: 12 mA maximum
APPLICATIONS
High speed signal conditioning
3 2 1 20 19
Video and pulse amplifiers
18
NC 4 NC
Data acquisition systems
17
INPUT 5 +V
S
Line drivers
NC 6 16 NC
Active filters
7 15
+INPUT OUTPUT
8 14
Available in 14-pin plastic PDIP, 14-pin hermetic CERDIP, and NC NC
AD841
20-pin LCC packages
9 10 11 12 13
Chips and MIL-STD-883B parts available
NOTES
1. NC = NO CONNECT.
Figure 2. LCC (E-20-1) Package
GENERAL DESCRIPTION
The AD841 is a member of the Analog Devices, Inc., family of use in high frequency signal conditioning circuits and wide
wide bandwidth operational amplifiers. This high speed/high bandwidth active filters. The extremely rapid settling time of
precision family includes the AD842, which is stable at a gain of the AD841 makes it the preferred choice for data acquisition
two or greater and has 100 mA minimum output current drive. applications that require 12-bit accuracy. The AD841 is also
These devices are fabricated using Analog Devices junction appropriate for other applications such as high speed DAC and
isolated complementary bipolar (CB) process. This process ADC buffer amplifiers and other wide bandwidth circuitry.
permits a combination of dc precision and wideband ac perfor-
PRODUCT HIGHLIGHTS
mance previously unobtainable in a monolithic op amp. In
1. The high slew rate and fast settling time of the AD841
addition to its 40 MHz unity-gain bandwidth product, the
make it ideal for DAC and ADC buffers, and all types of
AD841 offers extremely fast settling characteristics, typically
video instrumentation circuitry.
settling to within 0.01% of final value in 110 ns for a 10 V step.
2. The AD841 is a precision amplifier. It offers accuracy to
Unlike many high frequency amplifiers, the AD841 requires no
0.01% or better and wide bandwidth performance
external compensation. It remains stable over its full operating
previously available only in hybrids.
temperature range. It also offers a low quiescent current of
3. The AD841s thermally balanced layout and the speed of
12 mA maximum, a minimum output current drive capability
the CB process allow the AD841 to settle to 0.01% in 110 ns
of 50 mA, a low input voltage noise of 15 nV/Hz, and low
without the long tails that occur with other fast op amps.
input offset voltage of 1 mV maximum.
4. Laser wafer trimming reduces the input offset voltage to
The 300 V/s slew rate of the AD841, along with its 40 MHz 1 mV maximum on the K grade, thus eliminating the need
gain bandwidth, ensures excellent performance in video and for external offset nulling in many applications. Offset null
pulse amplifier applications. This amplifier is well suited for pins are provided for additional versatility.
Rev. C 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
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
rights of third parties that may result from its use. Specifications subject to change without notice. No
Tel: 781.329.4700 2013 Analog Devices, Inc. All rights reserved.
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
NC NC
V OFFSET NULL
S
NC NC
NC OFFSET NULL
NC NC
11340-001
11340-002AD841 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 Theory of Operation ...................................................................... 10
Applications ....................................................................................... 1 Offset Nulling ............................................................................. 10
Connection Diagrams ...................................................................... 1 Input Considerations ................................................................. 10
General Description ......................................................................... 1 AD841 Settling Time ................................................................. 10
Product Highlights ........................................................................... 1 Grounding and Bypassing ......................................................... 11
Revision History ............................................................................... 2 Capacitive Load Driving Ability ............................................... 11
Specifications ..................................................................................... 3 Terminated Line Driver ............................................................. 12
Absolute Maximum Ratings ............................................................ 5 Overdrive Recovery ................................................................... 12
Thermal Characteristics .............................................................. 5 Outline Dimensions ....................................................................... 13
ESD Caution .................................................................................. 5 Ordering Guide .......................................................................... 14
Typical Performance Characteristics ............................................. 6
REVISION HISTORY
2/13Rev. B to Rev. C
Removed TO-8 Package..................................................... Universal
Changed Input Voltage Noise 13 nV/Hz to 15 nV/Hz and
Changes to General Description Section ...................................... 1
Changes to Endnote 1, Table 1 ........................................................ 4
Added Operating Temperature Range, Table 2 ............................ 5
Deleted Using a Heat Sink Section ............................................... 11
Updated Outline Dimensions ....................................................... 13
Added Ordering Guide .................................................................. 14
11/88Rev. A to Rev. B
Rev. C | Page 2 of 16