a
FEATURES
AC PERFORMANCE
Unity-Gain Bandwidth: 40 MHz
Fast Settling: 110 ns to 0.01%
Slew Rate: 300 V/ s
Full Power Bandwidth: 4.7 MHz for 20 V p-p into a
500 Load
DC PERFORMANCE
Input Offset Voltage: 1 mV max
Input Voltage Noise: 13 nV/√Hz typ
Open-Loop Gain: 45 V/mV into a 1 k
Output Current: 50 mA min
Supply Current: 12 mA max
Wideband, Unity-Gain Stable,
Fast Settling Op Amp
AD841
CONNECTION DIAGRAMS
Plastic DIP (N) Package
TO-8 (H) Package
and
Cerdip (Q) Package
Load
APPLICATIONS
High Speed Signal Conditioning
Video and Pulse Amplifiers
Data Acquisition Systems
Line Drivers
Active Filters
Available in 14-Pin Plastic DIP Hermetic Cerdip, 12-Pin
TO-8 Metal Can and 20-Pin LCC Packages
Chips and MIL-STD-883B Parts Available
PRODUCT DESCRIPTION
LCC (E) Package
The AD841 is a member of the Analog Devices family of wide
bandwidth operational amplifiers. This high speed/high precision
family includes, among others, the AD840, which is stable at a
gain of 10 or greater, and 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 iso-
lated complementary bipolar (CB) process. This process permits
a combination of dc precision and wideband ac performance
previously unobtainable in a monolithic op amp. In addition to
its 40 MHz unity-gain bandwidth product, the AD841 offers ex-
tremely fast settling characteristics, typically settling to within
0.01% of final value in 110 ns for a 10 volt 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 13 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 use
in high frequency signal conditioning circuits and wide band-
width active filters. The extremely rapid settling time of the
AD841 makes it the preferred choice for data acquisition
applications which 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.
APPLICATION 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.
2. The AD841 is a precision amplifier. It offers accuracy to
0.01% or better and wide bandwidth performance previ-
ously available only in hybrids.
3. 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.
4. Laser wafer trimming reduces the input offset voltage to
1 mV max on the K grade, thus eliminating the need for
external offset nulling in many applications. Offset null
pins are provided for additional versatility.
5. The AD841 is an enhanced replacement for the
HA2541.
REV. B
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 rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
AD841–SPECIFICATIONS
(@ +25 C and
Model
Conditions
INPUT OFFSET VOLTAGE
Offset Drift
INPUT BIAS CURRENT
T
MIN
–T
MAX
Input Offset Current
T
MIN
–T
MAX
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
INPUT VOLTAGE RANGE
Common Mode
Common-Mode Rejection
INPUT VOLTAGE NOISE
Wideband Noise
OPEN-LOOP GAIN
Differential Mode
200
2
10
86
80
12
100
15
47
25
12
45
0.1
2
15 V dc, unless otherwise noted)
AD841K
Min Typ Max
0.5
35
8
10
0.4
0.5
3.5
0.1
5
6
0.2
0.3
1.0
3.3
AD841S
1
Min
Typ
0.5
35
3.5
0.1
8
12
0.4
0.6
Max
2.0
5.5
Units
mV
mV
µV/°C
µA
µA
µA
µA
kΩ
pF
V
dB
dB
nV/√Hz
µV
rms
V/mV
V/mV
Min
AD841J
Typ
Max
0.8
2.0
5.0
T
MIN
–T
MAX
35
3.5
200
2
10
103
100
12
109
15
47
25
20
45
25
12
10
86
80
200
2
12
110
15
47
45
V
CM
=
±
10 V
T
MIN
–T
MAX
f = 1 kHz
10 Hz to 10 MHz
V
O
=
±
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
O
= 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
11
±
10
50
5
40
3.1
4.7
10
10
300
00
110
200
700
0.03
0.022
±
15
11
90
86
+75
0
100
±
10
50
5
40
3.1
4.7
10
10
300
90
110
200
700
0.03
0.022
±
15
11
86
80
+75
–55
100
V
mA
Ω
MHz
MHz
ns
%
V/µs
ns
ns
ns
ns
%
Degree
V
V
mA
mA
dB
dB
°C
200
200
200
OVERDRIVE RECOVERY
DIFFERENTIAL GAIN
Differential Phase
POWER SUPPLY
Rated Performance
Operating Range
Quiescent Current
Power Supply Rejection Ratio
TEMPERATURE RANGE
Rated Performance
5
PACKAGE OPTIONS
LCC (E-20A)
Cerdip (Q-14)
Plastic (N-14)
TO-8 (H-12)
Chips
±
5
T
MIN
–T
MAX
V
S
=
±
5 V to
±
18 V
T
MIN
–T
MAX
±
18
12
14
±
5
±
18
12
14
±
5
±
18
12
16
86
80
0
100
+125
AD841JQ
AD841JN
AD841JH
AD841J CHIPS
AD841KQ
AD841KN
AD841KH
AD841SE, AD841SE/883B
AD841SQ, AD841SQ/883B
AD841SH, AD841SH/883B
AD841S CHIPS
NOTES
1
Standard Military Drawing Available: 5962-89641012A – (SE/883B); 5962-8964101CA – (SQ/883B).
2
Input offset voltage specifications are guaranteed after 5 minutes at T
A
= +25°C.
3
Full power bandwidth = Slew Rate/2
π
V
PEAK
.
3
Refer to Figure 19.
4
“S” grade T
MIN
–T
MAX
specifications are tested with automatic test equipment at T
A
= –55°C and T
A
= +125°C.
All min and max specifications are guaranteed. Specifications shown in
boldface
are tested on all production units.
Specifications subject to change without notice.
–2–
REV. B
AD841
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
18 V
Internal Power Dissipation
2
TO-8 (H) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 W
Plastic (N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 W
Cerdip (Q) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 W
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
Vs
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . .
±
6 V
Storage Temperature Range
Q, H, E . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–65°C to +125°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . +175°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C
NOTES
1
Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only, and functional
operation of the device at these or any other conditions above those indicated in
the operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
2
Maximum internal power dissipation is specified so that T
J
does not exceed
+175°C at an ambient temperature of +25°C.
Thermal Characteristics:
θ
JC
θ
JA
θ
SA
Cerdip Package 35°C/W 110°C/W 38°C/W Recommended Heat Sink:
TO-8 Package 30°C/W 100°C/W 37°C/W Aavid Engineering© #602B
Plastic Package 30°C/W 100°C/W
LCC Package
35°C/W 150°C/W
METALIZATION PHOTOGRAPH
Contact factory for latest dimensions.
Dimensions shown in inches and (mm).
REV. B
–3–
AD841–Typical Characteristics
(at +25 C and V
S
=
15 V, unless otherwise noted)
Figure 1. Input Common-Mode
Range vs. Supply Voltage
Figure 2. Output Voltage Swing
vs. Supply Voltage
Figure 3. Output Voltage Swing
vs. Load Resistance
Figure 4. Quiescent Current vs.
Supply Voltage
Figure 5. Input Bias Current vs.
Temperature
Figure 6. Output Impedance vs.
Frequency
Figure 7. Quiescent Current vs.
Temperature
Figure 8. Short-Circuit Current
Limit vs. Temperature
Figure 9. Gain Bandwidth Product
vs. Temperature
–4–
REV. B
AD841
Figure 10. Open-Loop Gain and
Phase Margin vs. Frequency
Figure 11. Open-Loop Gain vs.
Supply Voltage
Figure 12. Power Supply Rejection
vs. Frequency
Figure 13. Common-Mode
Rejection vs. Frequency
Figure 14. Large Signal Frequency
Response
Figure 15. Output Swing and
Error vs. Settling Time
Figure 16. Harmonic Distortion vs.
Frequency
Figure 17. Slew Rate vs.
Temperature
Figure 18. Input Voltage Noise
Spectral Density
REV. B
–5–
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