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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 into a 500 ⍀ Load

Wideband, Unity-Gain Stable, Fast Settling Op Amp AD841 CONNECTION DIAGRAMS Plastic DIP (N) Package TO-8 (H) Package and Cerdip (Q) Package

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⍀ 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

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 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/√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 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.

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: 617/329-4700 Fax: 617/326-8703

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