a
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
OS
, 1.2 A Max I
B
Small Packaging
AD8055 Available in SOT-23-5
AD8056 Available in 8-Lead microSOIC
Excellent Video Specifications (R
L
= 150 , 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
Low Cost, 300 MHz
Voltage Feedback Amplifiers
AD8055/AD8056
FUNCTIONAL BLOCK DIAGRAMS
N-8 and R-8
NC 1
–IN 2
+IN 3
–V
S
4
(Not to Scale)
SOT-23-5 (RT)
AD8055
V
OUT
1
–V
S
2
+IN 3
(Not to Scale)
AD8055
8 NC
7 +V
S
6 V
OUT
5 NC
5 +V
S
4 –IN
NC = NO CONNECT
N-8, R-8, microSOIC (RM)
OUT1
1
–IN1
2
+IN1
3
–V
S
4
(Not to Scale)
AD8056
8
+V
S
7
OUT
6
–IN2
5
+IN2
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.
5
4
3
2
R
C
V
IN
50
R
L
V
OUT
V
OUT
= 100mV p-p
R
L
= 100
G = +1
R
F
= 0
R
C
= 100
R
S
R
F
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
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.
GAIN – dB
1
0
–1
–2
–3
–4
–5
0.3M
1M
G = +10
R
F
= 909
G = +5
R
F
= 1000
10M
100M
FREQUENCY – Hz
G = +2
R
F
= 402
1G
Figure 1. Frequency Response
REV. E
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
© Analog Devices, Inc., 2001
ETC [ ETC ]
