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Data Sheet
FEATURES
AC performance
Unity-gain bandwidth: 40 MHz
Fast settling time: 110 ns to 0.01%
Slew rate: 300 V/µs
Full power bandwidth: 4.7 MHz for 20 V p-p into a 500 Ω load
DC performance
Input offset voltage: 1 mV maximum
Input voltage noise: 15 nV/√Hz typical
Open-loop gain: 45 V/mV into a 1 kΩ load
Output current: 50 mA minimum
Supply current: 12 mA maximum
Wideband, Unity-Gain Stable,
Fast Settling Op Amp
AD841
CONNECTION DIAGRAMS
NC
1
NC
2
BALANCE
3
14
NC
AD841
13
NC
12
BALANCE
11
+V
S
10
OUTPUT
–INPUT
4
+INPUT
5
–V
S 6
NC
7
TOP VIEW
(Not to Scale)
9
8
NC
NC
11340-001
NOTES
1. NC = NO CONNECT.
Figure 1. PDIP (N-14) Package and CERDIP (Q-14) Package
OFFSET NULL
OFFSET NULL
APPLICATIONS
NC
NC
1
–V
S
NC
NC
NC
NC
High speed signal conditioning
Video and pulse amplifiers
Data acquisition systems
Line drivers
Active filters
Available in 14-pin plastic PDIP, 14-pin hermetic CERDIP, and
20-pin LCC packages
Chips and MIL-STD-883B parts available
3
2
20 19
NC
NC
4
–INPUT
5
NC
6
+INPUT
7
NC
8
18
17
16
15
NC
+V
S
NC
OUTPUT
NC
AD841
9
10 11 12 13
14
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
wide bandwidth operational amplifiers. This high speed/high
precision family includes the
AD842
,
which is stable at a gain of
two or greater and has 100 mA minimum output current drive.
These devices are fabricated using Analog Devices’ junction
isolated complementary bipolar (CB) process. This process
permits a combination of dc precision and wideband ac perfor-
mance previously unobtainable in a monolithic op amp. In
addition to its 40 MHz unity-gain bandwidth product, the
AD841
offers extremely fast settling characteristics, typically
settling to within 0.01% of final value in 110 ns for a 10 V step.
Unlike many high frequency amplifiers, the
AD841
requires no
external compensation. It remains stable over its full operating
temperature range. It also offers a low quiescent current of
12 mA maximum, a minimum output current drive capability
of 50 mA, a low input voltage noise of 15 nV/√Hz, and low
input offset voltage of 1 mV maximum.
The 300 V/µs slew rate of the
AD841,
along with its 40 MHz
gain bandwidth, ensures excellent performance in video and
pulse amplifier applications. This amplifier is well suited for
Rev. C
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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.
use in high frequency signal conditioning circuits and wide
bandwidth active filters. The extremely rapid settling time of
the
AD841
makes it the preferred choice for data acquisition
applications that require 12-bit accuracy. The
AD841
is also
appropriate for other applications such as high speed DAC and
ADC buffer amplifiers and other wide bandwidth circuitry.
PRODUCT HIGHLIGHTS
1.
The high slew rate and fast settling time of the
AD841
make it ideal for DAC and ADC buffers, and all types of
video instrumentation circuitry.
The
AD841
is a precision amplifier. It offers accuracy to
0.01% or better and wide bandwidth performance
previously available only in hybrids.
The
AD841’s
thermally balanced layout and the speed of
the CB process allow the
AD841
to settle to 0.01% in 110 ns
without the long tails that occur with other fast op amps.
Laser wafer trimming reduces the input offset voltage to
1 mV maximum on the K grade, thus eliminating the need
for external offset nulling in many applications. Offset null
pins are provided for additional versatility.
2.
3.
4.
11340-002
AD841
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Connection Diagrams ...................................................................... 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Characteristics .............................................................. 5
ESD Caution .................................................................................. 5
Typical Performance Characteristics ............................................. 6
Data Sheet
Theory of Operation ...................................................................... 10
Offset Nulling ............................................................................. 10
Input Considerations ................................................................. 10
AD841 Settling Time ................................................................. 10
Grounding and Bypassing ......................................................... 11
Capacitive Load Driving Ability............................................... 11
Terminated Line Driver ............................................................. 12
Overdrive Recovery ................................................................... 12
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 14
REVISION HISTORY
2/13—Rev. 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
11/88—Rev. A to Rev. B
Rev. C | Page 2 of 16
Data Sheet
SPECIFICATIONS
T
A
= 25°C and ±15 V dc, unless otherwise noted. All minimum and maximum specifications are guaranteed.
Table 1.
Parameter
INPUT OFFSET VOLTAGE
2
Offset Drift
INPUT BIAS CURRENT
T
MIN
– T
MAX
Input Offset Current
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
INPUT VOLTAGE RANGE
Common Mode
Common-Mode Rejection
INPUT VOLTAGE NOISE
Wideband Noise
OPEN-LOOP GAIN
T
MIN
− T
MAX
Differential mode
Test Conditions/
Comments
T
MIN
− T
MAX
AD841J
Min Typ
Max
0.8
2.0
5.0
35
3.5
8
10
0.1
0.4
0.5
200
2
±10
86
80
12
100
15
47
25
12
45
25
20
±10
103
100
AD841K
Min Typ
Max
0.5
1.0
3.3
35
3.5
5
6
0.1
0.2
0.3
200
2
12
109
15
47
45
25
12
±10
86
80
Min
AD841S
1
Typ
Max
0.5
2.0
5.5
35
3.5
8
12
0.1
0.4
0.6
200
2
12
110
15
47
45
AD841
Unit
mV
mV
µV/°C
µA
µA
µA
µA
kΩ
pF
V
dB
dB
nV/√Hz
µV rms
V/mV
V/mV
V
CM
= ±10 V
T
MIN
– T
MAX
f = 1 kHz
10 Hz to 10 MHz
V
OUT
= ±10 V
R
LOAD
≥ 500 Ω
T
MIN
− T
MAX
R
LOAD
≥ 500 Ω
T
MIN
− T
MAX
V
OUT
= ±10 V
Open loop
V
OUT
= 90 mV p-p
V
OUT
= 20 V p-p
R
LOAD
≥ 500 Ω
A
V
= −1
A
V
= −1
A
V
= −1
A
V
= −1
to 0.1%
to 0.01%
−Overdrive
+Overdrive
f = 4.4 MHz
f = 4.4 MHz
OUTPUT CHARACTERISTICS
Voltage
Current
OUTPUT RESISTANCE
FREQUENCY RESPONSE
Unity Gain Bandwidth
Full Power Bandwidth
3
Rise Time
Overshoot
4
Slew Rate
4
Settling Time 10 V Step
4
±10
50
5
40
3.1
4.7
10
10
300
90
110
200
700
0.03
0.022
±15
±5
11
±18
12
14
±10
50
5
40
3.1
4.7
10
10
300
00
110
200
700
0.03
0.022
±15
±5
11
90
86
100
±18
12
14
±10
50
5
40
3.1
4.7
10
10
300
90
110
200
700
0.03
0.022
±15
±5
11
86
80
100
±18
12
16
V
mA
Ω
MHz
MHz
ns
%
V/µs
ns
ns
ns
ns
%
Degree
V
V
mA
mA
dB
dB
200
200
200
OVERDRIVE RECOVERY
DIFFERENTIAL GAIN
Differential Phase
POWER SUPPLY
Rated Performance
Operating Range
Quiescent Current
Power Supply Rejection Ratio
T
MIN
− T
MAX
V
S
= ±5 V to ±18 V
T
MIN
− T
MAX
86
80
100
Rev. C | Page 3 of 16
AD841
Parameter
TEMPERATURE RANGE
Rated Performance
5
1
2
Data Sheet
Test Conditions/
Comments
AD841J
Min Typ
Max
0
70
AD841K
Min Typ
Max
0
70
Min
−55
AD841S
1
Typ
Max
+125
Unit
°C
Standard military drawing available: 5962-89641012A – (SE/883B).
Input offset voltage specifications are guaranteed after 5 minutes at T
A
= 25°C.
3
Full power bandwidth = slew rate/2 π V
PEAK
.
4
Refer to Figure 22 to Figure 24.
5
S grade T
MIN
– T
MAX
specifications are tested with automatic test equipment at T
A
= −55°C and T
A
= +125°C.
Rev. C | Page 4 of 16
