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PDF AD8004 Data sheet ( Hoja de datos )
| Número de pieza | AD8004 | |
| Descripción | Current Feedback Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Quad 3000 V/s, 35 mW
Current Feedback Amplifier
AD8004
FEATURES
High Speed
250 MHz –3 dB Bandwidth (G = +1)
3000 V/s Slew Rate
21 ns Settling Time to 0.1%
1.8 ns Rise Time for 2 V Step
Low Power
3.5 mA/Amp Power Supply Current (35 mW/Amp)
Single Supply Operation
Fully Specified for +5 V Supply
Good Video Specifications (RL = 150 ⍀, G = +2)
Gain Flatness 0.1 dB to 30 MHz
0.04% Differential Gain Error
0.10؇ Differential Phase Error
Low Distortion
–78 dBc THD at 5 MHz
–61 dBc THD at 20 MHz
High Output Current of 50 mA
Available in a 14-Lead SOIC
APPLICATIONS
Image Scanners
Active Filters
Video Switchers
Special Effects
GENERAL DESCRIPTION
The AD8004 is a quad, low power, high speed amplifier designed
to operate on single or dual supplies. It utilizes a current feed-
back architecture and features high slew rate of 3000 V/ms
making the AD8004 ideal for handling large amplitude pulses.
Additionally, the AD8004 provides gain flatness of 0.1 dB to
CONNECTION DIAGRAM
SOIC (R) Package
OUTPUT 1
–IN 2
+IN 3
+VS 4
+IN 5
–IN 6
OUTPUT 7
14
AD8004
(TOP VIEW)
23
14 OUTPUT
13 –IN
12 +IN
11 –VS
10 +IN
9 –IN
8 OUTPUT
30 MHz while offering differential gain and phase error of
0.04% and 0.10∞. This makes the AD8004 suitable for video
electronics such as cameras and video switchers.
The AD8004 offers low power of 3.5 mA/amplifier and can run
on a single +4 V to +12 V power supply, while being capable of
delivering up to 50 mA of load current. All this is offered in a
small 14-lead SOIC package. These features make this
amplifier ideal for portable and battery powered applications
where size and power are critical.
The outstanding bandwidth of 250 MHz along with 3000 V/ms
of slew rate make the AD8004 useful in many general-purpose,
high speed applications where dual power supplies of up to ± 6 V
and single supplies from 4 V to 12 V are needed. The AD8004
is
in
atvhaeilRabpleaicnkathgee.industrial
temperature
range
of
–40∞C
to
+85∞C
1
G = +2
VIN = 50mV rms
RL = 100⍀
RF = 1.10k⍀
0.1 R PACKAGE
+5VS
؎5VS
0
–1
–2
–3
0 –4
–0.1
+5VS
؎5VS
–5
–0.2 –6
–0.3 –7
–0.4 –8
–0.5
1
10 40 100
FREQUENCY – MHz
–9
500
Figure 1. Frequency Response and Flatness, G = +2
0.04
0.03
0.02
0.01
0.00
–0.01
–0.02
–0.03
80 IRE
RL = 150⍀
VS = ؎5V
RF = 1.21k⍀
–0.04
1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH
0.12
0.10
0.08
0.06
0.04
0.02
0.00
–0.02
80 IRE
RL = 150⍀
VS = ؎5V
RF = 1.21k⍀
–0.04
1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH
Figure 2. Differential Gain/Differential Phase
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.
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 © 2003-2015 Analog Devices, Inc. All rights reserved.
1 page  
SPECIFICATIONS (@ TA = +25؇C, VS = +5 V, RL = 100 ⍀, unless otherwise noted.)
AD8004
Parameter
Test Conditions/Comments
AD8004A
AD8004S
Min Typ
Max Min Typ
Max Unit
DYNAMIC PERFORMANCE
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
Rise and Fall Time (10%
to 90%)
G = +2
G = +2, VO = 2 V Step
G = +2, VO = 2 V Step
G = +2, VO = 2 V Step
NOISE/HARMONIC
PERFORMANCE
Total Harmonic Distortion
Crosstalk, R Package,
Worst Case
Input Voltage Noise
Input Current Noise
Differential Gain Error
Differential Phase Error
Differential Gain Error
Differential Phase Error
fC = 5 MHz, VO = 2 V p-p, RL = 1 kΩ
f = 5 MHz, G = +2, RL = 1 kΩ
f = 10 kHz
f = 10 kHz, +In
–In
NTSC, G = +2, RL = 150 Ω, RF = 1.21 kΩ
NTSC, G = +2, RL = 150 Ω, RF = 1.21 kΩ
NTSC, G = +2, RL = 1 kΩ, RF = 1.21 kΩ
NTSC, G = +2, RL = 1 kΩ, RF = 1.21 kΩ
DC PERFORMANCE
Input Offset Voltage
Offset Drift
–Input Bias Current
+Input Bias Current
Open Loop Transresistance
TMIN to TMAX
TMIN to TMAX
TMIN to TMAX
VO = +1.5 V to +3.5 V
TMIN to TMAX
140
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode
Voltage Range
Common-Mode Rejection Ratio
Offset Voltage
–Input Current
+Input Current
+Input
–Input
+Input
VCM = +1 V to +3 V
VCM = +1 V to +3 V, TMIN to TMAX
VCM = +1 V to +3 V, TMIN to TMAX
52
OUTPUT CHARACTERISTICS
Output Voltage Swing
Output Current
Short Circuit Current
RL = 150 Ω
30 30 MHz
1100 1100 V/µs
24 24 ns
2.3 2.3 ns
–65 –65 dBc
–69 dB
1.5 1.5 nV/√Hz
38 38 pA/√Hz
38 38 pA/√Hz
0.06 0.06 %
0.25 0.25 Degree
0.01 0.01 %
0.08 0.08 Degree
1.0 2.5
1.0 2.5 mV
13
1 4 mV
15 15 µV/°C
±20 ±80
±20 ±80 µA
± 100
±110 µA
±35 ±100
±35 ±100 µA
± 115
±125 µA
230 140 230 kΩ
170 170 kΩ
2 2 MΩ
50 50 Ω
1.5 1.5 pF
3.2 3.2 V
57 52 57 dB
2 2 µA/V
15 15 µA/V
0.9 to 4.1
50
95
0.9 to 4.1
50
95
V
mA
mA
POWER SUPPLY
Operating Range
Total Quiescent Current
Power Supply Rejection Ratio
–Input Current
+Input Current
TMIN to TMAX
∆VS = +1 V, VCM = +2.5 V
TMIN to TMAX
TMIN to TMAX
Specifications subject to change without notice.
0, +4
56
13
14.5
62
1
6
+12 0, +4
14 13
15.5 14.5
56 62
1
6
+12 V
14 mA
17.5 mA
dB
µA/V
µA/V
REV. D
–3–
5 Page 
AD8004
THEORY OF OPERATION
The AD8004 is a member of a new family of high speed current-
feedback (CF) amplifiers offering new levels of bandwidth,
distortion, and signal-swing capability vs. power. Its wide dynamic
range capabilities are due to both a complementary high speed
bipolar process and a new design architecture. The AD8004 is
basically a two stage (Figure 30) rather than the conventional
one stage design. Both stages feature the current-on-demand
property associated with current feedback amplifiers. This
gives an unprecedented ratio of quiescent current to dynamic
performance. The important properties of slew rate and full
power bandwidth benefit from this performance. In addition
the second gain stage buffers the effects of load impedance,
significantly reducing distortion.
A full discussion of this new amplifier architecture is available on
the data sheet for the AD8011. This discussion only covers the
basic principles of operation.
DC AND AC CHARACTERISTICS
As with traditional op amp circuits the dc closed-loop gain is
defined as:
AV
=G
=1+
RF
RN
noninverting operation
AV
=G
=
−
RF
RN
inverting operation
The more exact relationships that take into account open-loop
gain errors are:
AV
=
1+
G
1−G +
RF
AO(s) TO(s)
for inverting (G is negative)
AV =
1+
G
G + RF
AO(s) TO(s)
for noninverting (G is positive)
In these equations the open-loop voltage gain (AO(s)) is common
to both voltage and current-feedback amplifiers and is the ratio
of output voltage to differential input voltage. The open-loop
transimpedance gain (TO(s)) is the ratio of output voltage to
inverting input current and is applicable to current-feedback
amplifiers. The open-loop voltage gain and open-loop transim-
pedance gain (TO(s)) of the AD8004 are plotted vs. frequency
in TPCs 15 and 18. These plots and the basic relationships can
be used to predict the first order performance of the AD8004 over
frequency. At low closed-loop gains the term (RF/TO(s)) dominates
the frequency response characteristics. This gives the result that
bandwidth is constant with gain, a familiar property of current
feedback amplifiers.
An RF of 1 k⍀ has been chosen as the nominal value to give
optimum frequency response with acceptable peaking at gains of
+2/–1. As can be seen from the above relationships, at higher
closed-loop gains reducing RF has the effect of increasing closed-
loop bandwidth. Table I gives optimum values for RF and RG
for a variety of gains.
IPP
VP
A1
IPN
IQ1
Q3 CP1
Q1
VN
ZI
Q2
INP
IE
Q4
IQ1
IPN
A1
C P1
CD
A2
CP2 ICQ + IO
V O´
A3
Z2
A2
CD AD8004
RF
RG
Figure 5. Simplified Block Diagram
VO
RL CL
REV. D
–9–
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AD8004.PDF ] | |
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