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AD8010 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8010
Beschreibung 200 mA Output Current High Speed Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 13 Seiten
AD8010 Datasheet, Funktion
a
FEATURES
200 mA of Output Current
9 Load
SFDR –54 dBc @ 1 MHz
Differential Gain Error 0.04%, f = 4.43 MHz
Differential Phase Error 0.06؇, f = 4.43 MHz
Maintains Video Specifications Driving Eight Parallel
75 Loads
0.02% Differential Gain
0.03؇ Differential Phase
0.1 dB Gain Flatness to 60 MHz
THD –72 dBc @ 1 MHz, RL = 18.75
IP3 42 dBm @ 5 MHz, RL = 18.75
1 dB Gain Compression 21 dBm @ 5 MHz, RL = 100
230 MHz –3 dB Bandwidth, G = +1, RL = 18.75
800 V/s Slew Rate, RL = 18.75
25 ns Settling Time to 0.1%
Available in 8-Lead DIP, 16-Lead Wide Body SOIC and
Thermally Enhanced 8-Lead SOIC
APPLICATIONS
Video Distribution Amplifier
VDSL, xDSL Line Driver
Communications
ATE
Instrumentation
200 mA Output Current
High-Speed Amplifier
AD8010
CONNECTION DIAGRAMS
8-Lead DIP and SOIC
NC 1
–IN 2
+IN 3
AD8010 8 NC
7 +VS
6 OUT
–VS 4
5 NC
NC = NO CONNECT
16-Lead Wide Body SOIC
NC 1
NC 2
IN 3
NC 4
+IN 5
NC 6
VS 7
NC 8
AD8010
16 NC
15 NC
14 +VS
13 NC
12 OUT
11 NC
10 NC
9 NC
NC = NO CONNECT
PRODUCT DESCRIPTION
The AD8010 is a low power, high current amplifier capable of
delivering a minimum load drive of 175 mA. Signal performance
such as 0.02% and 0.03° differential gain and phase error is
maintained while driving eight 75 back terminated video lines.
The current feedback amplifier features gain flatness to 60 MHz
and –3 dB (G = +1) signal bandwidth of 230 MHz and only
requires a typical of 15.5 mA supply current from ± 5 V supplies.
These features make the AD8010 an ideal component for Video
Distribution Amplifiers or as the drive amplifier within high data
rate Digital Subscriber Line (VDSL and xDSL) systems.
The AD8010 is an ideal component choice for any application
that needs a driver that will maintain signal quality when driving
low impedance loads.
The AD8010 is offered in three package options: an 8-lead DIP,
16-lead wide body SOIC and a low thermal resistance 8-lead
SOIC, and operates over the industrial temperature range of
–40°C to +85°C.
75
RF
RG +5V
VIN
RT
RS AD8010
5V
75
VOUT1
VOUT2
VOUT3
VOUT4
VOUT5
VOUT6
VOUT7
VOUT8
Figure 1. Video Distribution Amplifier
REV. B
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000






AD8010 Datasheet, Funktion
5
POUT 4dBm
4dBm
5
G = +2
15 RL = 18.75
25
fO = 5MHz
f = 10kHz
35
45
55
65
69dBm
69dBm
75
85
4.965
4.985 5.0 5.015
5.035
FREQUENCY MHz
Figure 9. Intermodulation Distortion
35
FREQUENCY = 5MHz
45
G = +2
RL = AS SHOWN (SEE SCHEMATIC)
55
RL = 18.75
65
75
85
95
105
10
RL = 100
RG
RL1 = FOR RL = 100PIN
RL1 = 23.1 FOR RL = 18.75
150
50
8 6 4 2 0 2 4
POUT dBm
RF
50POUT
RL1 50
6 8 10 12
Figure 10. Total Harmonic Distortion vs. POUT; G = +2
2
G = +1
1
G = +2
0
1
2
G = +3
3
4 GAIN AS SHOWN
VO = 0.2V p-p
5 RL = 18.75
6
7
0.1
1 10
FREQUENCY MHz
100
1000
Figure 11. Small Signal Closed-Loop Frequency
Response; RL = 18.75
AD8010
0
10
20
30
40
50
60
70
PMEASURE = 10dBm
(FULL SCALE)
GAIN = 6.6
RF
RG 50
150
50
50
500kHz TONE SPACING FROM
500kHz TO 5.5MHz WITH
4 MISSING TONES
80
90
0 1 2 3 4 5 6 7 8 9 10
FREQUENCY MHz
Figure 12. Multitone Distortion; RL = 100
55
G = +2
60 VO = 2V p-p
f = 5MHz
65
70
75
80 2ND
85 3RD
90
15
100 200 300 400 500
LOAD
Figure 13. Harmonic Distortion vs. Load
8.0 G = +2
VO = 0.2V p-p
7.0 NUMBER OF VIDEO LOADS AS SHOWN
6.0
5.0
4.0
12
3.0
8
2.0
1.0
0.0
4
1
1 10 100 1000
FREQUENCY MHz
Figure 14. Closed-Loop Frequency Response vs.
Number of Video Loads
REV. B
–5–

6 Page









AD8010 pdf, datenblatt
AD8010
Closed-Loop Gain and Bandwidth
The AD8010 is a current feedback amplifier optimized for use
in high performance video and data acquisition applications.
Since it uses a current feedback architecture, its closed-loop
–3 dB bandwidth is dependent on the magnitude of the feedback
resistor. The desired closed-loop bandwidth and gain are obtained
by varying the feedback resistor (RF) to set the bandwidth, and
varying the gain resistor (RG) to set the desired gain. The char-
acteristic curves and specifications for this data sheet reflect the
performance of the AD8010 using the values of RF noted at the
top of the specifications table. If a greater –3 dB bandwidth
and/or slew rate is required (at the expense of video performance),
Table I provides the recommended resistor values. Figure 32
shows the test circuit and conditions used to produce Table I.
Effect of Feedback Resistor Tolerance on Gain Flatness
Because of the relationship between the 3 dB bandwidth and the
feedback resistor, the fine scale gain flatness will, to some extent,
vary with feedback resistor tolerance. It is therefore recommended
that resistors with a 1% tolerance be used if it is desired to main-
tain flatness over a wide range of production lots. In addition,
resistors of different construction have different associated para-
sitic capacitance and inductance. Metal-film resistors were used
for the bulk of the characterization for this data sheet. It is pos-
sible that values other than those indicated will be optimal for
other resistor types.
Quality of Coaxial Cable
Optimum flatness when driving a coax cable is possible only
when the driven cable is terminated at each end with a resistor
matching its characteristic impedance. If the coax was ideal,
then the resulting flatness would not be affected by the length of
the cable. While outstanding results can be achieved using inex-
pensive cables, it should be noted that some variation in flatness
due to varying cable lengths may be experienced.
Table I. –3 dB Bandwidth and Slew Rate vs. Closed-Loop
Gain and Resistor Values
Package: N-8
Closed-Loop
Gain
+1
+2
+5
+10
RF ()
453
374
348
562
RG ()
374
86.6
61.9
–3 dB BW
(MHz)
285
255
200
120
Slew Rate
(V/s)
900
900
800
550
Package: R-16
Closed-Loop
Gain
+1
+2
+5
+10
RF ()
412
392
392
604
RG ()
392
97.6
66.5
–3 dB BW
(MHz)
245
220
160
95
Slew Rate
(V/s)
900
900
800
550
Package: SO-8
Closed-Loop
Gain
RF ()
+1 392
+2 374
+5 348
+10 499
RG ()
374
86.6
54.9
1. VO = 0.2 V p-p for –3 dB Bandwidth.
2. VO = 2 V p-p for Slew Rate.
3. Bypassing per Figure 29.
–3 dB BW
(MHz)
345
305
220
135
Slew Rate
(V/s)
950
1000
1000
650
150
VIN
50
VOUT
RF 18.75
RG
Figure 32. Test Circuit for Table I
REV. B
–11–

12 Page





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