Analog Devices AD8055 6 i Datasheet

Low Cost, 300 MHz

Voltage Feedback Amplifiers

AD8055/AD8056

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
Low DC Errors: 5 mV Max V

, 1.2 ␮A Max I

OS

B

Small Packaging

AD8055 Available in SOT-23-5
AD8056 Available in 8-Lead MSOP

Excellent Video Specifications (R

= 150 ⍀, G = +2)

L

Gain Flatness 0.1 dB to 40 MHz

0.01% Differential Gain Error

0.02ⴗ Differential Phase Error
Drives 4 Video Loads (37.5 V) with 0.02% Differential
Gain and 0.1ⴗ Differential Phase

Low Power, ⴞ5V Supplies 5 mA Typ/Amplifier Power

Supply Current

High Output Drive Current: Over 60 mA

APPLICATIONS
Imaging
Photodiode Preamp
Video Line Drivers
Differential Line Drivers
Professional Cameras
Video Switchers
Special Effects
A-to-D Drivers
Active Filters

PRODUCT DESCRIPTION

The AD8055 (single) and AD8056 (dual) voltage feedback ampli­fiers offer bandwidth and slew rate typically found in current
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 excellent
overall performance. For video applications, their differential
gain and phase error are 0.01% and 0.02∞ into a 150 W load and

0.02% and 0.1∞ while driving four video loads (37.50 W). Their

0.1 dB flatness out to 40 MHz, wide bandwidth out to 300 MHz,
along with 1400 V/ms slew rate and 20 ns settling time, make
them useful for a variety of high speed applications.

FUNCTIONAL BLOCK DIAGRAMS

N-8 and R-8

AD8055

1

NC

–IN

2

3

+IN

4

–V

S

(Not to Scale)

NC = NO CONNECT

NC

8

+V

7

S

6

V

OUT

5

NC

V

OUT

–V

+IN

1

2

S

3

RT-5

AD8055

(Not to Scale)

+V

5

S

–IN

4

N-8, R-8, RM-8

OUT1

–IN1

+IN1

–V

S

1

2

3

4

(Not to Scale)

+V

8

S

7

OUT

–IN2

6

+IN2

5

AD8056

The AD8055 and AD8056 require only 5 mA typ/amplifier of
supply current and operate on a dual ±5 V or a single +12 V
power supply, while capable of delivering over 60 mA of load
current. All this is offered in a small 8-lead PDIP package,
8-lead SOIC packages, a 5-lead SOT-23-5 package (AD8055),
and an 8-lead MSOP package (AD8056). These features make
the AD8055/AD8056 ideal for portable and battery-powered
applications where size and power are critical. These amplifiers in
the R-8, N-8, and RM packages are available in the extended
temperature range of –40∞C to +125∞C.

5

R

4

3

2

1

0

GAIN – dB

–1

–2

–3

–4

–5

0.3M 1G

C

V

IN

50⍀

R

G

1M 10M 100M

R

F

G = +10

= 909⍀

R

F

G = +5

= 1000⍀

R

F

FREQUENCY – Hz

V

OUT

R

L

G = +1

= 0⍀

R

F

= 100⍀

R

C

V
R

OUT

= 100⍀

L

= 100mV p-p

G = +2

= 402⍀

R

F

Figure 1. Frequency Response

REV. I

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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

(@ TA = 25ⴗC, VS = ⴞ5 V, RF = 402 ⍀, RL = 100 ⍀, Gain = +2,

AD8055/AD8056–SPECIFICATIONS

unless otherwise noted.)

AD8055A/AD8056A

Parameter Conditions Min Typ Max Unit

DYNAMIC PERFORMANCE

–3 dB Bandwidth G = +1, VO = 0.1 V p-p 220 300 MHz

G=+1, VO = 2 V p-p 125 150 MHz
G=+2, V
G=+2, V

Bandwidth for 0.1 dB Flatness V

= 100 mV p-p 25 40 MHz

O

Slew Rate G = +1, V

G = +2, V
Settling Time to 0.1% G = +2, V
Rise and Fall Time, 10% to 90% G = +1, V

G = +1, V

G = +2, V

= 0.1 V p-p 120 160 MHz

O

= 2 V p-p 125 150 MHz

O

= 4 V Step 1000 1400 V/ms

O

= 4 V Step 750 840 V/ms

O

= 2 V Step 20 ns

O

= 0.5 V Step 2 ns

O

= 4 V Step 2.7 ns

O

= 0.5 V Step 2.8 ns

O

G = +2, VO = 4 V Step 4 ns

NOISE/HARMONIC PERFORMANCE

Total Harmonic Distortion f

= 10 MHz, VO = 2 V p-p, RL = 1 kW –72 dBc

C

f

= 20 MHz, VO = 2 V p-p, RL = 1 kW –57 dBc

C

Crosstalk, Output-to-Output (AD8056) f = 5 MHz, G = +2 –60 dB
Input Voltage Noise f = 100 kHz 6 nV/÷Hz
Input Current Noise f = 100 kHz 1 pA/÷Hz
Differential Gain Error NTSC, G = +2, R

NTSC, G = +2, R
Differential Phase Error NTSC, G = +2, R

= 150 W 0.01 %

L

= 37.5 W 0.02 %

L

= 150 W 0.02 Degree

L

NTSC, G = +2, RL = 37.5 W 0.1 Degree

DC PERFORMANCE

Input Offset Voltage 35 mV

T

MIN

to T

MAX

10 mV

Offset Drift 6 mV/∞C
Input Bias Current 0.4 1.2 mA

Open-Loop Gain V

to T

T

T

MIN

O

MIN

MAX

= ±2.5 V 66 71 dB

to T

MAX

64 dB

1 mA

INPUT CHARACTERISTICS

Input Resistance 10 MW
Input Capacitance 2pF
Input Common-Mode Voltage Range 3.2 ±V
Common-Mode Rejection Ratio VCM = ±2.5 V 82 dB

OUTPUT CHARACTERISTICS

Output Voltage Swing RL = 150 W 2.9 3.1 ±V
Output Current* V

= ±2.0 V 55 60 mA

O

Short Circuit Current* 110 mA

POWER SUPPLY

Operating Range ±4.0 ±5.0 ±6.0 V
Quiescent Current AD8055 5.4 6.5 mA

to 125∞C 7.6 mA

T

MIN

T

to 85∞C 7.3 mA

MIN

AD8056 10 12 mA

to 125∞C 13.9 mA

T

MIN

T

to 85∞C13.3mA

MIN

Power Supply Rejection Ratio +V

= +5 V to +6 V, –VS = –5 V 66 72 dB

S

–VS = –5 V to –6 V, +VS = +5 V 69 86 dB

OPERATING TEMPERATURE RANGE AD8055ART –40 +85 ∞C

AD8055AR, AD8055AN, AD8056AR, –40 +125 ∞C

AD8056AN, AD8056ARM

*Output current is limited by the maximum power dissipation in the package. See the power derating curves.

Specifications subject to change without notice.

–2–

REV. I

AD8055/AD8056

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 V

Input Voltage (Common-Mode) . . . . . . . . . . . . . . . . . . . . ±V

S

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ±2.5 V

Output Short Circuit Duration

. . . . . . . . . . . . . . . . . . . . . . .Observe Power Derating Curves

Storage Temperature Range N, R . . . . . . . . . –65°C to +150°C

Operating Temperature Range (A Grade) . . . –40°C to +125°C

Lead Temperature Range (Soldering 10 sec) . . . . . . . . . 300°C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.

MAXIMUM POWER DISSIPATION

The maximum power that can be safely dissipated by the
AD8055/AD8056 is limited by the associated rise in junction
temperature. The maximum safe junction temperature for plastic
encapsulated devices is determined by the glass transition tem­perature of the plastic, approximately 150°C. Exceeding this limit
temporarily may cause a shift in parametric performance due to a
change in the stresses exerted on the die by the package. Exceed­ing a junction temperature of 175°C for an extended period can
result in device failure.

ORDERING GUIDE

While the AD8055/AD8056 are internally short-circuit protected,
this may not be sufficient to guarantee that the maximum junction
temperature (150°C) is not exceeded under all conditions. To
ensure proper operation, it is necessary to observe the maximum
power derating curves.

2.5

2.0

SOIC-8

1.5

1.0

0.5

MAXIMUM POWER DISSIPATION – W

0.0

–55 –45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85 95 125

PDIP-8

MSOP-8

SOT-23-5

115105

AMBIENT TEMPERATURE – ⴗC

Figure 2. Plot of Maximum Power Dissipation
vs. Temperature for AD8055/AD8056

Temperature Package Package Branding

Model Range Description Option Code

AD8055AN –40°C to +125°C PDIP N-8
AD8055AR –40°C to +125°C SOIC R-8
AD8055AR-REEL –40°C to +125°C 13" Tape and Reel R-8
AD8055AR-REEL7 –40°C to +125°C 7" Tape and Reel R-8
AD8055ARZ* –40°C to +125°C SOIC R-8
AD8055ART-R2 –40°C to +85°CReel (SOT-23) RT-5 H3A
AD8055ART-REEL –40°C to +85°C 13" Tape and Reel RT-5 H3A
AD8055ART-REEL7 –40°C to +85°C 7" Tape and Reel RT-5 H3A
AD8055ARTZ-REEL7* –40°C to +85°C 7" Tape and Reel RT-5 H3A
AD8056AN –40°C to +125°C PDIP N-8
AD8056AR –40°C to +125°C SOIC R-8
AD8056AR-REEL –40°C to +125°C 13" Tape and Reel R-8
AD8056AR-REEL7 –40°C to +125°C 7" Tape and Reel R-8
AD8056ARZ* –40°C to +125°C SOIC R-8
AD8056ARZ-REEL7* –40°C to +125°C 7" Tape and Reel R-8
AD8056ARM –40°C to +125°C MSOP RM-8 H5A
AD8056ARM-REEL –40°C to +125°C 13" Tape and Reel RM-8 H5A
AD8056ARM-REEL7 –40°C to +125°C 7" Tape and Reel RM-8 H5A
AD8056ARMZ* –40°C to +125°C MSOP RM-8 H5A
AD8056ARMZ-REEL* –40°C to +125°C 13" Tape and Reel RM-8 H5A
AD8056ARMZ-REEL7* –40°C to +125°C 7" Tape and Reel RM-8 H5A

*This is a lead-free product.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD8055/AD8056 feature proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.

REV. I

–3–

AD8055/AD8056–Typical Performance Characteristics

4.7␮F

+V

S

0.01␮F

0.001␮F

HP8130A

PULSE

GENERATOR

= 1ns

T

R/TF

V

100⍀

IN

50⍀

3

AD8055

2

7

4

–V

S

TPC 1. Test Circuit, G = +1, RL = 100

6

4.7␮F

0.01␮F

0.001␮F

V

OUT

100⍀

W

HP8130A

PULSE

GENERATOR

= 0.67ns

T

R/TF

TPC 4. Test Circuit, G = –1, RL = 100

402⍀

+V

4.7␮F

S

0.01␮F

0.001␮F

V

402⍀

IN

57⍀

2

AD8055

3

7

6

V

OUT

4

4.7␮F

0.01␮F

0.001␮F

–V

S

100⍀

W

TPC 2. Small Step Response, G = +1

TPC 3. Large Step Response, G = +1

TPC 5. Small Step Response, G = –1

TPC 6. Large Step Response, G = –1

–4–

REV. I