APPLICATIONS
Line Drivers
DAC and ADC Buffers
Video and Pulse Amplifiers
Available in Plastic DIP, Hermetic Metal Can,
Hermetic Cerdip, SOIC and LCC Packages and in
Chip Form
MIL-STD-883B Parts Available
Available in Tape and Reel in Accordance with
EIA-481A Standard
PRODUCT DESCRIPTION
The AD842 is a member of the Analog Devices family of wide
bandwidth operational amplifiers. This device is 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 80 MHz gain bandwidth, the
AD842 offers extremely fast settling characteristics, typically
settling to within 0.01% of final value in less than 100 ns for a
10 volt step.
The AD842 also offers a low quiescent current of 13 mA, a high
output current drive capability (100 mA minimum), a low input
voltage noise of 9 nV√Hz and a low input offset voltage (1 mV
maximum).
The 375 V/µs slew rate of the AD842, along with its 80 MHz
gain bandwidth, ensures excellent performance in video and
pulse amplifier applications. This amplifier is ideally suited for
use in high frequency signal conditioning circuits and wide
bandwidth active filters. The extremely rapid settling time of
the AD842 makes this amplifier the preferred choice for data
acquisition applications which require 12-bit accuracy. The
BALANCE
BALANCE 3
12
NC
–INPUT 4
11
V+
19 NC
NC
13
20 BALANCE
14
NC 2
1 NC
NC 1
2 BALANCE
LCC (E) Package
Plastic DIP (N) Package
and
Cerdip (Q) Package
AD842
+
10
OUTPUT
V– 6
9
NC
NC 7
8
NC
–IN
NC
+IN
NC
NC
+INPUT 5
TOP VIEW
4
18
5
6
NC = NO CONNECT
NC
17
16
7
+
AD842
8
+VS
NC
15 OUTPUT
14 NC
NC 11
NC 12
NC 13
DC PERFORMANCE
Input Offset Voltage: 1 mV max
Input Offset Drift: 14 V/؇C
Input Voltage Noise: 9 nV/√Hz typ
Open-Loop Gain: 90 V/mV into a 500 ⍀ Load
Output Current: 100 mA min
Quiescent Supply Current: 14 mA max
CONNECTION DIAGRAMS
3 NC
FEATURES
AC PERFORMANCE
Gain Bandwidth Product: 80 MHz (Gain = 2)
Fast Settling: 100 ns to 0.01% for a 10 V Step
Slew Rate: 375 V/s
Stable at Gains of 2 or Greater
Full Power Bandwidth: 6.0 MHz for 20 V p-p
NC 9
–VS 10
a
Wideband, High Output Current,
Fast Settling Op Amp
AD842
NC = NO CONNECT
TO-8 (H) Package
NC
BALANCE
SOIC (R-16) Package
NC
BALANCE
NC 1
V+
BALANCE 2
AD842
OUTPUT
+INPUT
V–
NC
TOP VIEW
NOTE: CAN BE TIED TO V+
NC = NO CONNECT
15 BALANCE
14 +V
S
13 NC
NC 4
+INPUT 5
+
NC
AD842
–INPUT 3
–INPUT
NC
16 NC
+
12 OUTPUT
NC 6
11 NC
–VS 7
10 NC
NC 8
TOP VIEW
9
NC
NC = NO CONNECT
AD842 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 AD842 make
it ideal for DAC and ADC buffers amplifiers, lines drivers
and all types of video instrumentation circuitry.
2. The AD842 is a precision amplifier. It offers accuracy to
0.01% or better and wide bandwidth; performance previously
available only in hybrids.
3. Laser-wafer trimming reduces the input offset voltage of
1 mV max, thus eliminating the need for external offset
nulling in many applications.
4. Full differential inputs provide outstanding performance in
all standard high frequency op amp applications where the
circuit gain will be 2 or greater.
5. The AD842 is an enhanced replacement for the HA2542.
REV. E
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: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
