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PDF AD8001 Data sheet ( Hoja de datos )
| Número de pieza | AD8001 | |
| Descripción | Current Feedback Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
800 MHz, 50 mW
Current Feedback Amplifier
AD8001
FEATURES
Excellent Video Specifications (RL = 150 ⍀, G = +2)
Gain Flatness 0.1 dB to 100 MHz
0.01% Differential Gain Error
0.025؇ Differential Phase Error
Low Power
5.5 mA Max Power Supply Current (55 mW)
High Speed and Fast Settling
880 MHz, –3 dB Bandwidth (G = +1)
440 MHz, –3 dB Bandwidth (G = +2)
1200 V/s Slew Rate
10 ns Settling Time to 0.1%
Low Distortion
–65 dBc THD, fC = 5 MHz
33 dBm Third Order Intercept, F1 = 10 MHz
–66 dB SFDR, f = 5 MHz
High Output Drive
70 mA Output Current
Drives Up to 4 Back-Terminated Loads (75 ⍀ Each)
While Maintaining Good Differential Gain/Phase
Performance (0.05%/0.25؇)
APPLICATIONS
A-to-D Drivers
Video Line Drivers
Professional Cameras
Video Switchers
Special Effects
RF Receivers
GENERAL DESCRIPTION
The AD8001 is a low power, high speed amplifier designed
to operate on ± 5 V supplies. The AD8001 features unique
9
6
G = +2
3 RL = 100⍀
0
–3
–6
VS = ؎5V
RFB = 820⍀
VS = ؎5V
RFB = 1k⍀
–9
–12
10M
100M
FREQUENCY – Hz
1G
Figure 1. Frequency Response of AD8001
REV. D
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 companies.
FUNCTIONAL BLOCK DIAGRAMS
8-Lead PDIP (N-8),
5-Lead SOT-23-5
CERDIP (Q-8) and SOIC (R-8)
(RT-5)
NC 1
8 NC
–IN 2
7 V+
+IN 3
6 OUT
V– 4 AD8001 5 NC
AD8001
VOUT 1
5 +VS
–VS 2
+IN 3
4 –IN
NC = NO CONNECT
transimpedance linearization circuitry. This allows it to drive
video loads with excellent differential gain and phase perfor-
mance on only 50 mW of power. The AD8001 is a current
feedback amplifier and features gain flatness of 0.1 dB to 100 MHz
while offering differential gain and phase error of 0.01% and
0.025°. This makes the AD8001 ideal for professional video
electronics such as cameras and video switchers. Additionally,
the AD8001’s low distortion and fast settling make it ideal for
buffer high speed A-to-D converters.
The AD8001 offers low power of 5.5 mA max (VS = ± 5 V) and
can run on a single +12 V power supply, while being capable of
delivering over 70 mA of load current. These features make this
amplifier ideal for portable and battery-powered applications
where size and power are critical.
The outstanding bandwidth of 800 MHz along with 1200 V/µs
of slew rate make the AD8001 useful in many general-purpose
high speed applications where dual power supplies of up to ± 6 V
and single supplies from 6 V to 12 V are needed. The AD8001 is
available in the industrial temperature range of –40°C to +85°C.
Figure 2. Transient Response of AD8001; 2 V Step, G = +2
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.
1 page  
AD8001–Typical Performance Characteristics
806⍀
VIN
HP8133A
PULSE
GENERATOR
TR/TF = 50ps
50⍀
806⍀
+VS 0.001F
0.1F
AD8001
0.1F
0.001F
–VS
VOUT TO
TEKTRONIX
CSA 404 COMM.
SIGNAL
ANALYZER
RL = 100⍀
TPC 1. Test Circuit , Gain = +2
400mV
5ns
TPC 4. 2 V Step Response, G = +2
TPC 2. 1 V Step Response, G = +2
909⍀
+VS 0.001F
0.1F
VIN
LeCROY 9210
PULSE
GENERATOR
50⍀
TR/TF = 350ps
AD8001
0.1F
0.001F
–VS
VOUT TO
TEKTRONIX
CSA 404 COMM.
SIGNAL
ANALYZER
RL = 100⍀
TPC 5. Test Circuit, Gain = +1
0.5V
5ns
TPC 3. 2 V Step Response, G = +1
TPC 6. 100 mV Step Response, G = +1
–4– REV. D
5 Page 
AD8001
THEORY OF OPERATION
A very simple analysis can put the operation of the AD8001, a
current feedback amplifier, in familiar terms. Being a current
feedback amplifier, the AD8001’s open-loop behavior is expressed
as transimpedance, ∆VO/∆I–IN, or TZ. The open-loop transimped-
ance behaves just as the open-loop voltage gain of a voltage
feedback amplifier, that is, it has a large dc value and decreases
at roughly 6 dB/octave in frequency.
Since the RIN is proportional to 1/gM, the equivalent voltage
gain is just TZ × gM, where the gM in question is the trans-
conductance of the input stage. This results in a low open-loop
input impedance at the inverting input, a now familiar result.
Using this amplifier as a follower with gain, Figure 4, basic
analysis yields the following result.
VO = G ×
TZ (S)
VIN TZ (S) + G × RIN + R1
G = 1 + R1
R2
RIN = 1 / gM ≈ 50 Ω
R1
R2
RIN
VOUT
VIN
Figure 4. Follower with Gain
Recognizing that G × RIN << R1 for low gains, it can be seen to
the first order that bandwidth for this amplifier is independent
of gain (G). This simple analysis in conjunction with Figure 5
can, in fact, predict the behavior of the AD8001 over a wide
range of conditions.
1M
100k
10k
Considering that additional poles contribute excess phase at
high frequencies, there is a minimum feedback resistance below
which peaking or oscillation may result. This fact is used to
determine the optimum feedback resistance, RF. In practice,
parasitic capacitance at Pin 2 will also add phase in the feedback
loop, so picking an optimum value for RF can be difficult.
Figure 6 illustrates this problem. Here the fine scale (0.1 dB/
div) flatness is plotted versus feedback resistance. These plots
were taken using an evaluation card which is available to cus-
tomers so that these results may readily be duplicated.
Achieving and maintaining gain flatness of better than 0.1 dB at
frequencies above 10 MHz requires careful consideration of
several issues.
0.1
RF =
0 649⍀
RF = 698⍀
–0.1
–0.2
G = +2
–0.3
RF = 750⍀
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
1M
10M
FREQUENCY – Hz
100M
Figure 6. 0.1 dB Flatness vs. Frequency
Choice of Feedback and Gain Resistors
Because of the above-mentioned relationship between the band-
width and feedback resistor, the fine scale gain flatness will, to
some extent, vary with feedback resistance. It, therefore, is
recommended that once optimum resistor values have been
determined, 1% tolerance values should be used if it is desired to
maintain flatness over a wide range of production lots. In addition,
resistors of different construction have different associated parasitic
capacitance and inductance. Surface-mount resistors were used
for the bulk of the characterization for this data sheet. It is not
recommended that leaded components be used with the AD8001.
1k
100
10
100k
1M
10M
100M
FREQUENCY – Hz
1G
Figure 5. Transimpedance vs. Frequency
–10–
REV. D
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AD8001.PDF ] | |
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