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.

a

AD842*

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

Wideband, High Output Current,

Fast Settling Op Amp

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 mono-

lithic 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

AD842 is also appropriate for other applications such as high

speed DAC and ADC buffer amplifiers and other wide band-

width 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.

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

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

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

CONNECTION DIAGRAMS

Plastic DIP (N) Package

and

Cerdip (Q) Package

TOP VIEW

14

13

12

11

10

9

8

1

2

3

4

5

6

7

NC

NC

BALANCE

–INPUT

+INPUT

V–

NC

NC

BALANCE

NC

V+

OUTPUT

NC

NC

NC = NO CONNECT

AD842

+

LCC (E) Package

NC

–IN

NC

+IN

NC

NC

NC

OUTPUT

+

AD842

18

17

16

15

14

4

5

6

7

8

NC

NC = NO CONNECT

TO-8 (H) Package

NC

NC

NC

NC

NC = NO CONNECT

NC

BALANCE

–INPUT

+INPUT

V–

V+

OUTPUT

BALANCE

TOP VIEW

+

AD842

NOTE: CAN BE TIED TO V+

SOIC (R-16) Package

TOP VIEW

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

BALANCE

–INPUT

NC

+INPUT

NC

NC

BALANCE

NC

OUTPUT

NC

NC

NC

+

NC = NO CONNECT

AD842

NC

NC

*Covered by U.S. Patent Nos. 4,969,823 and 5,141,898.