REV. B

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a

AD8055/AD8056

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

Low Cost, 300 MHz

Voltage Feedback Amplifiers

FUNCTIONAL BLOCK DIAGRAMS

FEATURES

Low Cost Single (AD8055) and Dual (AD8056)

Easy to Use Voltage Feedback Architecture

High Speed

300 MHz, –3 dB Bandwidth (G = +1)

1400 V/ s Slew Rate

20 ns Settling to 0.1%

Low Distortion: –72 dBc @ 10 MHz

Low Noise: 6 nV/

√Hz

Small Packaging

AD8055 Available in SOT-23-5

AD8056 Available in 8-Lead microSOIC

, G = +2)

Gain Flatness 0.1 dB to 40 MHz

0.01% Differential Gain Error

0.02 Differential Phase Error

Drives Four Video Loads (37.5

) with 0.02% and

0.1 Differential Gain and Differential Phase

Low Power,

5 V Supplies

5 mA Typ/Amplifier Power Supply Current

High Output Drive Current: Over 60 mA

APPLICATIONS

Imaging

Photodiode Preamp

Video Line Driver

Differential Line Driver

Professional Cameras

Video Switchers

Special Effects

A-to-D Driver

Active Filters

PRODUCT DESCRIPTION

The AD8055 (single) and AD8056 (dual) voltage feedback

amplifiers offer bandwidth and slew rate typically found in cur-

rent feedback amplifiers. Additionally, these amplifiers are easy

to use and available at a very low cost.

Despite their low cost, the AD8055 and AD8056 provide excel-

lent overall performance. For video applications, their differen-

tial gain and phase error are 0.01% and 0.02

° into a 150 Ω load,

and 0.02% and 0.1

° while driving four video loads (37.5 Ω).

Their 0.1 dB flatness out to 40 MHz, wide bandwidth out to

300 MHz, along with 1400 V/

µs slew rate and 20 ns settling

time, make them useful for a variety of high speed applications.

The AD8055 and AD8056 require only 5 mA typ/amplifier of

supply current and operate on dual

±5 V or single +12 V power

supply, while being capable of delivering over 60 mA of load

current. All this is offered in a small 8-lead plastic DIP, 8-lead

SOIC packages, 5-lead SOT-23-5 package (AD8055) and an

8-lead microSOIC package (AD8056). These features make

the AD8055/AD8056 ideal for portable and battery powered

applications where size and power are critical. These amplifiers are

available in the industrial temperature range of –40

°C to +85°C.

FREQUENCY – Hz

0.3M

1G

1M

10M

100M

5

4

–5

3

2

1

0

–1

–2

–3

–4

G = +1

G = +2

G = +5

G = +10

50

Figure 1. Frequency Response

N-8 and SO-8

1

2

3

4

8

7

6

5

(Not to Scale)

AD8055

–IN

+IN

NC

NC

NC

NC = NO CONNECT

SOT-23-5 (RT)

1

2

3

5

4

(Not to Scale)

–IN

+IN

AD8055

N-8, SO-8, microSOIC (RM)

1

2

3

4

8

7

6

5

(Not to Scale)

AD8056

–IN1

+IN1

OUT

–IN2

OUT1

+IN2