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參數(shù)資料
| 型號： | AD8010 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | 200 mA Output Current High Speed Amplifier |
| 中文描述： | 200毫安輸出電流高速放大器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 164K |
| 代理商： | AD8010 |
AD8010
–11–
REV. A
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 feed-
back resistor. The desired closed-loop bandwidth and gain are
obtained by varying the feedback resistor (R
F
) to set the band-
width, and varying the gain resistor (R
G
) to set the desired gain.
The characteristic curves and specifications for this data sheet
reflect the performance of the AD8010 using the values of R
F
noted at the top of the specifications table. If a greater –3 dB band-
width and/or slew rate is required (at the expense of video per-
formance), 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 ex-
tent, vary with feedback resistor tolerance. It is therefore recom-
mended that resistors with a 1% tolerance be used if it is desired
to maintain flatness over a wide range of production lots. In
addition, resistors of different construction have different associ-
ated parasitic capacitance and inductance. Metal-film resistors
were used for the bulk of the characterization for this data sheet.
It is possible that values other than those indicated will be opti-
mal 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.
150
V
50
V
R
F
R
G
V
OUT
18.75
V
V
IN
Figure 32. Test Circuit for Table I
NOTES
1
V
O
= 0.2 V p-p for –3 dB Bandwidth.
2
V
= 2 V p-p for Slew Rate.
3
Bypassing per Figure 29.
Table I. –3 dB Bandwidth and Slew Rate vs. Closed-Loop
Gain and Resistor Values
Package: N-8
Closed-Loop
Gain
–3 dB BW
(MHz)
Slew Rate
(V/
m
s)
R
F
(
V
)
453
374
348
562
R
G
(
V
)
∞
374
86.6
61.9
+1
+2
+5
+10
285
255
200
120
900
900
800
550
Package: R-16
Closed-Loop
Gain
–3 dB BW
(MHz)
Slew Rate
(V/
m
s)
R
F
(
V
)
R
G
(
V
)
∞
392
97.6
66.5
+1
+2
+5
+10
412
392
392
604
245
220
160
95
900
900
800
550
Package: SO-8
Closed-Loop
Gain
–3 dB BW
(MHz)
Slew Rate
(V/
m
s)
R
F
(
V
)
R
G
(
V
)
∞
374
86.6
54.9
+1
+2
+5
+10
392
374
348
499
345
305
220
135
950
1000
1000
650
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