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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/μs 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
OS
, 1.2 μA max I
B
Small packaging
AD8055 available in 5-lead SOT-23
AD8056 available in 8-lead MSOP
Excellent video specifications (R
L
= 150 Ω, G = +2)
Gain flatness 0.1 dB to 40 MHz
0.01% differential gain error
0.02° differential phase error
Drives 4 video loads (37.5 V) with 0.02% differential
Gain and 0.1° differential phase
Low power, ±5 V supplies 5 mA typ/amplifier power
supply current
High output drive current: over 60 mA
NC
–IN
+IN
–V
S
1
2
3
4
CONNECTION DIAGRAMS
8
7
6
NC
+V
S
V
OUT
01063-001
V
OUT
–V
S
+IN
1
2
3
5
+V
S
AD8055
NC = NO CONNECT
5
NC
4
–IN
AD8055
Figure 1. N-8 and R-8
OUT1
–IN1
+IN1
–V
S
1
2
3
4
8
7
6
Figure 2. RJ-5
+V
S
OUT
–IN2
+IN2
01063-003
AD8056
5
Figure 3. N-8, R-8, and RM-8
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 a dual ±5 V or a single +12 V
power supply, while capable of delivering over 60 mA of load
current. The AD8055 is available in a small 8-lead PDIP, an 8-lead
SOIC, and a 5-lead SOT-23, while the AD8056 is available in an
8-lead MSOP. 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-8
packages are available in the extended temperature range of
−40°C to +125°C.
5
4
3
2
V
IN
50Ω
R
G
R
F
R
L
G = +1
R
F
= 0Ω
R
C
= 100Ω
R
C
V
OUT
V
OUT
= 100mV p-p
R
L
= 100Ω
APPLICATIONS
Imaging
Photodiode preamps
Video line drivers
Differential line drivers
Professional cameras
Video switchers
Special effects
A-to-D drivers
Active filters
GENERAL 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 Ω load and 0.02% and 0.1° while driving four video loads
(37.50 Ω).
Rev. J
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. Specifications subject to change without notice. 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.
GAIN (dB)
1
0
–1
–2
–3
–4
–5
0.3M
1M
G = +10
R
F
= 909Ω
G = +5
R
F
= 1000Ω
10M
100M
FREQUENCY (Hz)
G = +2
R
F
= 402Ω
1G
Figure 4. Frequency Response
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
01063-004
01063-002
AD8055/AD8056
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Connection Diagrams...................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Maximum Power Dissipation ..................................................... 5
ESD Caution.................................................................................. 5
Typical Performance Characteristics ............................................. 6
Test Circuits..................................................................................... 11
Applications..................................................................................... 12
Four-Line Video Driver............................................................. 12
Single-Ended-to-Differential Line Driver............................... 12
Low Noise, Low Power Preamp................................................ 12
Power Dissipation Limits .......................................................... 13
Resistor Selection ....................................................................... 13
Driving Capacitive Loads.......................................................... 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 16
REVISION HISTORY
2/06—Rev. I to Rev. J
Changes to Format .............................................................Universal
Updated Outline Dimensions ....................................................... 15
Changes to Ordering Guide .......................................................... 16
2/04—Rev. H to Rev. I
Changes to Features.......................................................................... 1
Changes to Ordering Guide ............................................................ 3
6/03—Rev. G to Rev. H
Changes to Absolute Maximum Ratings ....................................... 3
Updated Ordering Guide................................................................. 3
Updated Outline Dimensions ....................................................... 11
2/03—Rev. F to Rev. G
Changes to Product Description .................................................... 1
Changes to Specifications ................................................................ 2
Change to Ordering Guide.............................................................. 3
Outline Dimensions Updated ....................................................... 11
10/02—Rev. E to Rev. F
Text Changes to Reflect Extended Temperature Range for
R-8, N-8 Packages..............................................................................1
Changes to Specifications.................................................................2
Changes to Absolute Maximum Ratings........................................3
Figure 2 Replaced ..............................................................................3
Changes to Ordering Guide .............................................................3
Outline Dimensions Updated....................................................... 11
7/01—Rev. D to Rev. E
TPC 24 Replaced with New Graph .................................................7
3/01—Rev. C to Rev. D
Edit to Curve in TPC 23 ...................................................................7
2/01—Rev. B to Rev. C
Edits to Text at Top of Specifications Page (65 to 5)....................2
Rev. J | Page 2 of 16
AD8055/AD8056
SPECIFICATIONS
T
A
= 25°C, V
S
= ±5 V, R
F
= 402 Ω, R
L
= 100 Ω, Gain = +2, unless otherwise noted.
Table 1.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Conditions
G = +1, V
O
= 0.1 V p-p
G=+1, V
O
= 2 V p-p
G=+2, V
O
= 0.1 V p-p
G=+2, V
O
= 2 V p-p
V
O
= 100 mV p-p
G = +1, V
O
= 4 V step
G = +2, V
O
= 4 V step
G = +2, V
O
= 2 V step
G = +1, V
O
= 0.5 V step
G = +1, V
O
= 4 V step
G = +2, V
O
= 0.5 V step
G = +2, V
O
= 4 V step
f
C
= 10 MHz, V
O
= 2 V p-p, R
L
= 1 kΩ
f
C
= 20 MHz, V
O
= 2 V p-p, R
L
= 1 kΩ
f = 5 MHz, G = +2
f = 100 kHz
f = 100 kHz
NTSC, G = +2, R
L
= 150 Ω
NTSC, G = +2, R
L
= 37.5 Ω
NTSC, G = +2, R
L
= 150 Ω
NTSC, G = +2, R
L
= 37.5 Ω
AD8055A/AD8056A
Min
Typ
Max
220
125
120
125
25
1000
750
300
150
160
150
40
1400
840
20
2
2.7
2.8
4
−72
−57
−60
6
1
0.01
0.02
0.02
0.1
3
T
MIN
to T
MAX
Offset Drift
Input Bias Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
OUTPUT CHARACTERISTICS
Output Voltage Swing
Output Current
1
Short-Circuit Current
1
T
MIN
to T
MAX
V
O
= ±2.5 V
T
MIN
to T
MAX
6
0.4
1
66
64
71
1.2
5
10
Unit
MHz
MHz
MHz
MHz
MHz
V/μs
V/μs
ns
ns
ns
ns
ns
dBc
dBc
dB
nV/√Hz
pA/√Hz
%
%
Degree
Degree
mV
mV
μV/°C
μA
μA
dB
dB
MΩ
pF
±V
dB
±V
mA
mA
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
Rise and Fall Time, 10% to 90%
NOISE/HARMONIC PERFORMANCE
Total Harmonic Distortion
Crosstalk, Output-to-Output (AD8056)
Input Voltage Noise
Input Current Noise
Differential Gain Error
Differential Phase Error
DC PERFORMANCE
Input Offset Voltage
V
CM
= ±2.5 V
R
L
= 150 Ω
V
O
= ±2.0 V
2.9
55
10
2
3.2
82
3.1
60
110
Rev. J | Page 3 of 16
AD8055/AD8056
Parameter
POWER SUPPLY
Operating Range
Quiescent Current
Conditions
AD8055A/AD8056A
Min
Typ
Max
±4.0
AD8055
T
MIN
to 125°C
T
MIN
to 85°C
AD8056
T
MIN
to 125°C
T
MIN
to 85°C
+V
S
= +5 V to +6 V, −V
S
= −5 V
−V
S
= –5 V to −6 V, +V
S
= +5 V
AD8055ART
AD8055AR, AD8055AN, AD8056AR, AD8056AN, AD8056ARM
±5.0
5.4
7.6
10
13.9
66
69
−40
−40
72
86
+85
+125
±6.0
6.5
7.3
12
13.3
Unit
V
mA
mA
mA
mA
mA
mA
dB
dB
°C
°C
Power Supply Rejection Ratio
OPERATING TEMPERATURE RANGE
1
Output current is limited by the maximum power dissipation in the package. See Figure 5.
Rev. J | Page 4 of 16
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