Low Cost, 300 MHz
Voltage Feedback Amplifiers
AD8055/AD8056
CONNECTION 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/μs slew rate
20 ns settling to 0.1%
Low distortion: −72 dBc @ 10 MHz
Low noise: 6 nV/√Hz
1
2
3
4
NC
–IN
+IN
8
7
6
5
NC
1
2
3
V
5
4
+V
OUT
–V
S
+V
S
S
V
OUT
+IN
–IN
–V
S
NC
AD8055
AD8055
Figure 2. RJ-5
S
NC = NO CONNECT
Figure 1. N-8 and R-8
1
2
3
4
8
7
6
5
OUT1
–IN1
+IN1
+V
Low dc errors: 5 mV max VOS, 1.2 μA max IB
Small packaging
OUT
–IN2
+IN2
AD8055 available in 5-lead SOT-23
AD8056 available in 8-lead MSOP
Excellent video specifications (RL = 150 Ω, G = +2)
Gain flatness 0.1 dB to 40 MHz
0.01% differential gain error
–V
S
AD8056
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.
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
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.
High output drive current: over 60 mA
APPLICATIONS
Imaging
Photodiode preamps
Video line drivers
Differential line drivers
Professional cameras
Video switchers
Special effects
5
V
R
= 100mV p-p
= 100Ω
OUT
L
R
C
4
3
V
V
OUT
IN
50Ω
A-to-D drivers
Active filters
G = +1
= 0Ω
R
R
2
R
F
F
C
R
R
L
G
= 100Ω
G = +2
= 402Ω
1
R
F
GENERAL DESCRIPTION
0
–1
–2
–3
–4
–5
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.
G = +10
F
R
= 909Ω
G = +5
R
= 1000Ω
F
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).
0.3M
1M
10M
100M
1G
FREQUENCY (Hz)
Figure 4. Frequency Response
Rev. J
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