270 MHz, 400 μA
Current Feedback Amplifier
Data Sheet
AD8005
Rev. B Document Feedback
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FEATURES
Ultralow power
400 μA power supply current (4 mW on ±5 V
S
)
Specified for single supply operation
High speed
270 MHz, −3 dB bandwidth (G = +1)
170 MHz, −3 dB bandwidth (G = +2)
280 V/μs slew rate (G = +2)
28 ns settling time to 0.1%, 2 V step (G = +2)
Low distortion/noise
−63 dBc at 1 MHz, V
O
= 2 V p-p
−50 dBc at 10 MHz, V
O
= 2 V p-p
4.0 nV/√Hz input voltage noise at 10 MHz
Good video specifications (R
L
= 1 kΩ, G = +2)
Gain flatness 0.1 dB to 30 MHz
0.11% differential gain error
0.4° differential phase error
APPLICATIONS
Signal conditioning
A/D buffer
Power sensitive, high speed systems
Battery powered equipment
Loop/remote power systems
Communication or video test systems
Portable medical instruments
GENERAL DESCRIPTION
The AD8005 is an ultralow power, high speed amplifier with a
wide signal bandwidth of 170 MHz and slew rate of 280 V/μs.
This performance is achieved while consuming only 400 μA of
quiescent supply current. These features increase the operating
time of high speed battery powered systems without reducing
dynamic performance.
The current feedback design results in gain flatness of 0.1 dB to
30 MHz while offering differential gain and phase errors of 0.11%
and 0.4°. Harmonic distortion is low over a wide bandwidth with
THDs of −63 dBc at 1 MHz and −50 dBc at 10 MHz. Ideal features
for a signal conditioning amplifier or buffer to a high speed A-to-D
converter in portable video, medical or communication systems.
The AD8005 is characterized for +5 V and ±5 V supplies and
operates over the industrial temperature range of −40°C to
+85°C. The amplifier is supplied in 8-lead PDIP, 8-lead SOIC_N,
and 5-lead SOT-23 packages.
FUNCTIONAL BLOCK DIAGRAMS
Fig
ure 1. 8-Lead PDIP and SOIC_N
Figure 2. 5-Lead SOT-23
Figure 3. Frequency Response; G = ±2, V
S
= +5 V or ±5 V
Figure 4. Distortion vs. Frequency; V
S
= ±5 V
AD8005
NC
1
–IN
2
+IN
3
–V
S
4
NC
8
+V
S
7
OUT
6
NC
5
NC = NO CONNECT
TOP VIEW
(Not to Scale)
12146-002
AD8005
TOP VIEW
(Not to Scale)
OUT
1
+IN
3
–V
S
2
+V
S
5
–IN
4
12146-003
0.1 1 10 100 500
NORMALIZED GAIN (dB)
FREQUENCY (MHz)
0
3
2
1
–1
–2
–3
–4
–5
–6
V
S
= +5V
V
S
= ±5V
G = +2
V
OUT
= 200mV p-p
R
L
= 1kΩ
12146-001
11020
DISTORTION (dBc)
FREQUENCY (MHz)
G = +2
V
OUT
= 2V p-p
R
L
= 1kΩ
40
–60
–80
–100
–50
–70
–90
THIRD HARMONIC
SECOND HARMONIC
12146-004
