REV. C

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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

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a

AD846

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

450 V/ s, Precision,

Current-Feedback Op Amp

CONNECTION DIAGRAMS

FEATURES

AC PERFORMANCE

Slew Rate: 450 V/ s

Full Power Bandwidth: 6.8 MHz at 20 V p-p,

Fast Settling: for 10 V Step: 110 ns to 0.01%,

80 ns to 0.1%

Differential Gain: <0.01% @ 4.4 MHz

Differential Phase: <0.028 @ 4.4 MHz

Total Harmonic Distortion (THD): 0.0005% @ 100 kHz

Open-Loop Transimpedance: 200 M

Input Voltage Noise: 2 nV/

√Hz

DC PERFORMANCE

Input Offset Voltage: 75

V max (B Grade)

Input Offset Drift: 3.5

V/ C max (B Grade)

Quiescent Supply Current: 6.5 mA max

APPLICATIONS

High Speed DAC Buffers

Multiflash ADC Error Amplifiers

Flash ADC Buffers

Coaxial Cable Drivers

High Performance Audio Circuitry

Available in Plastic Mini-DIP, Hermetic Cerdip, and

Plastic SOIC (A) Package

MIL-STD-883B Part Available

PRODUCT DESCRIPTION

The AD846 is a monolithic, very high speed operational ampli-

fier offering high performance. Although technically classed as a

current-feedback or transimpedance amplifier, it may be used

in much the same way as traditional op amps while providing

significant performance benefits. Employing Analog Devices’

junction isolated complementary bipolar (CB) process, the AD846

achieves true “12-bit” (0.01%) precision on critical ac and dc

parameters, a level of performance unmatched by amplifiers

fabricated using either the dielectrically isolated (DI) or other

bipolar processes.

The AD846 offers significant advantages over conventional

high speed operational amplifiers. It maintains a nearly con-

stant bandwidth and settling time to 0.01% over a wide range

of closed-loop gains. This makes the AD846 ideal for amplifying

the residue in multiple-pass analog-to-digital converters.

Other advantages include: low input errors and high open-loop

transresistance (200 M

Ω) into a 500 Ω load, ensuring true

12-bit dc accuracy for closed-loop gains from –1 to gains

greater than –100. This combination of ac and dc perfor-

mance makes the AD846 an excellent choice for buffering

precision high speed DACs and flash ADCs.

Plastic Mini-DIP (N) Package

and

Cerdip (Q) Package

The AD846 is available in three performance grades. The AD846A

and AD846B are rated over the industrial temperature range

of –40

°C to +85°C. The AD846S is rated over the full mili-

tary temperature range of –55

°C to +125°C and is available

processed to MIL-STD-883B, Rev C.

The AD846 is available in two types of 8-lead packages: plastic

mini-DIP and hermetic cerdip. The AD846AR-16 is available in

the 16-lead SOIC package. “A” and “S” grade chips are also

available.

PRODUCT HIGHLIGHTS

1. The AD846 achieves settling times of 110 ns to 0.01%

for gains of –1 to –10, with a 450 V/

µs slew rate, while

consuming only 5 mA of supply current.

2. For closed-loop gains of –1 to –100, the high speed perfor-

mance of the AD846 is achieved without sacrificing full 12-bit

dc precision.

3. The AD846 is well suited to line driver and video buffer

applications where the properties of low distortion and high

slew rate are required.

SOIC (R) Package

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

NC = NO CONNECT

NC

NC

–INPUT

NC

+INPUT

NC

NC

NC

NC

NC

OUTPUT

COMPENSATION

NC

NC

TOP VIEW

(Not to Scale)

AD846

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