Analog Devices AD841 Datasheet

Wideband, Unity-Gain Stable,

a

FEATURES
AC PERFORMANCE
Unity-Gain Bandwidth: 40 MHz
Fast Settling: 110 ns to 0.01%
Slew Rate: 300 V/ms
Full Power Bandwidth: 4.7 MHz for 20 V p-p into a

500 V Load

DC PERFORMANCE
Input Offset Voltage: 1 mV max
Input Voltage Noise: 13 nV/√
Open-Loop Gain: 45 V/mV into a 1 kV Load
Output Current: 50 mA min
Supply Current: 12 mA max

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

Hz typ

Fast Settling Op Amp

CONNECTION DIAGRAMS

Plastic DIP (N) Package

and

Cerdip (Q) Package

LCC (E) Package

AD841

TO-8 (H) Package

PRODUCT DESCRIPTION

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 iso­lated 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 ex­tremely 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/√
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 band­width active filters. The extremely rapid settling time of the

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.

Hz and low input

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 previ­ously 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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] Fax: [phone]

AD841–SPECIFICATIONS

Model AD841J AD841K AD841S

(@ +258C and 615 V dc, unless otherwise noted)

1

Conditions Min Typ Max Min Typ Max Min Typ Max Units

INPUT OFFSET VOLTAGE

2

T

MIN–TMAX

0.8 2.0 0.5 1.0 0.5 2.0 mV

5.0 3.3 5.5 mV

Offset Drift 35 35 35 µV/°C

INPUT BIAS CURRENT 3.5 8 3.5 5 3.5 8 µA

T

MIN–TMAX

10 612µA

Input Offset Current 0.1 0.4 0.1 0.2 0.1 0.4 µA

T

MIN–TMAX

0.5 0.3 0.6 µA

INPUT CHARACTERISTICS Differential Mode

Input Resistance 200 200 200 kΩ
Input Capacitance 2 2 2 pF

INPUT VOLTAGE RANGE

Common Mode 610 12 610 12 610 12 V
Common-Mode Rejection V

= ±10 V 86 100 103 109 86 110 dB

CM

T

MIN–TMAX

80 100 80 dB

INPUT VOLTAGE NOISE f = 1 kHz 15 15 15 nV/√

Wideband Noise 10 Hz to 10 MHz 47 47 47 µV rms

OPEN-LOOP GAIN V

= ±10 V

O

≥ 500 Ω 25 45 25 45 25 45 V/mV

R

LOAD

T

MIN–TMAX

12 20 12 V/mV

OUTPUT CHARACTERISTICS

Voltage R

Current V

≥ 500 Ω

LOAD

T

MIN–TMAX

= ±10 V 50 50 50 mA

OUT

±10 ±10 ±10 V

OUTPUT RESISTANCE Open Loop 5 5 5 Ω
FREQUENCY RESPONSE

Unity Gain Bandwidth V
Full Power Bandwidth

Rise Time
Overshoot
Slew Rate

4

4

4

3

Settling Time – 10 V Step A

= 90 mV p-p 40 40 40 MHz

OUT

VO = 20 V p-p

≥ 500 Ω 3.1 4.7 3.1 4.7 3.1 4.7 MHz

R

LOAD

AV = –1 10 10 10 ns
AV = –1 10 10 10 %
AV = –1 200 300 200 300 200 300 V/µs

= –1

V

to 0.1% 90 00 90 ns
to 0.01% 110 110 110 ns

OVERDRIVE RECOVERY –Overdrive 200 200 200 ns

+Overdrive 700 700 700 ns

DIFFERENTIAL GAIN f = 4.4 MHz 0.03 0.03 0.03 %

Differential Phase f = 4.4 MHz 0.022 0.022 0.022 Degree

POWER SUPPLY

Rated Performance ±15 ±15 ±15 V
Operating Range ±5 ±18 ±5 ±18 ±5 ±18 V
Quiescent Current 11 12 11 12 11 12 mA

14 14 16 mA

Power Supply Rejection Ratio V

TEMPERATURE RANGE

Rated Performance

5

T

MIN–TMAX

= ±5 V to ±18 V 86 100 90 100 86 100 dB

S

T

MIN–TMAX

80 86 80 dB

0 +75 0 +75 –55 +125 °C

PACKAGE OPTIONS

LCC (E-20A) AD841SE, AD841SE/883B
Cerdip (Q-14) AD841JQ AD841KQ AD841SQ, AD841SQ/883B
Plastic (N-14) AD841JN AD841KN
TO-8 (H-12) AD841JH AD841KH AD841SH, AD841SH/883B
Chips AD841J CHIPS 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 TA = +25°C.

3

Full power bandwidth = Slew Rate/2 π V

3

Refer to Figure 19.

4

“S” grade T

All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units.
Specifications subject to change without notice.

MIN–TMAX

specifications are tested with automatic test equipment at TA = –55°C and TA = +125°C.

PEAK

.

–2–

REV. B

Hz

AD841

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V

Internal Power Dissipation

2

1

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

METALIZATION PHOTOGRAPH

Contact factory for latest dimensions.

Dimensions shown in inches and (mm).

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 TJ does not exceed
+175°C at an ambient temperature of +25°C.
Thermal Characteristics:

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

θ

JC

θ

JA

θ

SA

REV. B

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