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PDF ( 数据手册 , 数据表 ) AD8002

零件编号 AD8002
描述 Dual 600 MHz/ 50 mW Current Feedback Amplifier
制造商 Analog Devices
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AD8002 数据手册, 描述, 功能
Data Sheet
FEATURES
Excellent video specifications (RL = 150 Ω, G = +2)
Gain flatness: 0.1 dB to 60 MHz
Differential gain error: 0.01%
Differential phase error: 0.02°
Low power
Maximum power supply current (50 mW): 5.0 mA/amp
High speed and fast settling
−3 dB bandwidth (G = +1): 600 MHz
−3 dB bandwidth (G = +2): 500 MHz
Slew rate: 1200 V/µs
Settling time to 0.1%: 16 ns
Low distortion
THD at fC = 5 MHz: −65 dBc
Third-order intercept at f1 = 10 MHz: 33 dBm
SFDR at f = 5 MHz: −66 dB
Crosstalk at f = 5 MHz: −60 dB
High output drive
Over 70 mA output current
Drives up to eight back terminated 75 Ω loads (four
loads/side) while maintaining good differential
gain/phase performance (0.01%/0.17°)
Available in 8-lead SOIC and MSOP packages
APPLICATIONS
Analog-to-digital drivers
Video line drivers
Differential line drivers
Professional cameras
Video switchers
Special effects
RF receivers
GENERAL DESCRIPTION
The AD8002 is a dual, low power, high speed amplifier
designed to operate on ±5 V supplies. The AD8002 features
unique transimpedance linearization circuitry, which allows the
AD8002 to drive video loads with excellent differential gain
and phase performance on only 50 mW of power per amplifier.
The AD8002 is a current feedback amplifier and features gain
flatness of 0.1 dB to 60 MHz while offering differential gain and
phase error of 0.01% and 0.02°, which makes the AD8002 ideal
for professional video electronics such as cameras and video
switchers. Additionally, the low distortion and fast settling of
the AD8002 make it ideal for buffer high speed analog-to-
digital converters (ADCs).
Rev. E
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
Dual 600 MHz, 50 mW
Current Feedback Amplifier
AD8002
PIN CONNECTION BLOCK DIAGRAM
OUT1 1
8 V+
–IN1 2
7 OUT2
+IN1 3
6 –IN2
V– 4
AD8002
Figure 1.
5 +IN2
The AD8002 offers a low power of 5.0 mA/amp maximum
(VS = ±5 V) and can run on a single 12 V power supply, yet is
capable of delivering over 70 mA of load current. It is offered
in 8-lead SOIC and MSOP packages. These features make this
amplifier ideal for portable and battery-powered applications
where size and power are critical.
The bandwidth of 600 MHz along with 1200 V/µs of slew rate
make the AD8002 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 AD8002 is available
in the industrial temperature range of −40°C to +85°C.
SIDE 1
G = +2
1V STEP
SIDE 2
200mV
5ns
Figure 2. 1 V Step Response, G = +1
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com







AD8002 pdf, 数据表
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
AD8002
SIDE 1
G = +1
100mV STEP
SIDE 1
G = +2
100mV STEP
SIDE 2
20mV
5ns
Figure 6. 100 mV Step Response, G = +1
SIDE 1
G = +1
1V STEP
SIDE 2
20mV
5ns
Figure 7. 1 V Step Response, G = +1
SIDE 1
G = +2
100mV STEP
20mV
SIDE 2
5ns
Figure 8. 100 mV Step Response, G = +2
20mV
SIDE 2
5ns
Figure 9. 1 V Step Response, G = +2
1
G = +2
RL = 100Ω
VIN = 50mV
SIDE 1
SIDE 2
0
–1
–2
0.1 –3
0
SIDE 1
–4
–0.1
–5
–0.2
SIDE 2
–6
–0.3
–7
–0.4
–8
–0.5
1M
10M
100M
FREQUENCY (Hz)
–9
1G
Figure 10. Frequency Response and Flatness, G = +2 (See Figure 41)
–50
G = +2
RL = 100Ω
–60
–70
SECOND HARMONIC
–80
THIRD HARMONIC
–90
–100
–110
10k
100k
1M
FREQUENCY (Hz)
10M
100M
Figure 11. Distortion vs. Frequency, G = +2, RL = 100 Ω
Rev. E | Page 7 of 21







AD8002 equivalent, schematic
Data Sheet
DRIVING CAPACITIVE LOADS
The AD8002 was designed primarily to drive nonreactive loads.
If driving loads with a capacitive component is desired, the best
frequency response is obtained by the addition of a small series
resistance as shown in Figure 50.
909Ω
RSERIES
IN
RL
500Ω
CL
Figure 50. Driving Capacitive Loads
Figure 51 shows the optimum value for RSERIES vs. capacitive
load (CL). It is worth noting that the frequency response of the
circuit when driving large capacitive loads is dominated by
the passive roll-off of RSERIES and CL.
40
30
20
10
0
0 5 10 15 20
CL (pF)
Figure 51. Recommended RSERIES vs. Capacitive Load
25
COMMUNICATIONS
Distortion is a key specification in communications applica-
tions. Intermodulation distortion (IMD) is a measure of the
ability of an amplifier to pass complex signals without the
generation of spurious harmonics. Third-order products are
usually the most problematic because several of them fall
near the fundamentals and do not lend themselves to filtering.
Theory predicts that the third-order harmonic distortion
components increase in power at three times the rate of the
fundamental tones. The specification of the third-order intercept
as the virtual point where fundamental and harmonic power
are equal is one standard measure of distortion performance.
Op amps used in closed-loop applications do not always obey
this simple theory. Figure 52 shows the AD8002 performance
summarized at a gain of +2. Here, the worst third-order
products are plotted vs. input power. The third-order intercept
of the AD8002 is 33 dBm at 10 MHz.
AD8002
–45
G = +2
–50
f1 = 10MHz
f2 = 12MHz
–55
–60
–65
2f2 f1
2f1 f2
–70
–75
–80
–8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6
INPUT POWER (dBm)
Figure 52. Third-Order IMD vs. Input Power; f1 = 10 MHz, f2 = 12 MHz
OPERATION AS A VIDEO LINE DRIVER
The AD8002 has been designed to offer good performance as a
video line driver. The important specifications of differential
gain (0.01%) and differential phase (0.02°) meet the most
exacting HDTV demands for driving one video load with each
amplifier. The AD8002 also drives four back terminated loads
(two each), as shown in Figure 53, with equally impressive
performance (0.01%, 0.07°). Another important consideration
is isolation between loads in a multiple load application. The
AD8002 has more than 40 dB of isolation at 5 MHz when
driving two 75 Ω back terminated loads.
750Ω
750Ω
+VS 4.7µF
+
0.1µF
75Ω
75Ω CABLE
VOUT 1
75Ω
8
2
1/2
AD8002
1
3 0.1µF
4
75Ω
75Ω CABLE
VOUT 2
75Ω
75Ω
CABLE
VIN
75Ω
4.7µF
–VS +
750Ω
5
1/2
AD8002
6
7
750Ω
75Ω
75Ω CABLE
VOUT 3
75Ω
75Ω
75Ω CABLE
VOUT 4
75Ω
Figure 53. Video Line Driver
Rev. E | Page 15 of 21










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