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參數(shù)資料
| 型號： | AD8073 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Cost, Triple Video Amplifiers(低成本,三視頻放大器) |
| 中文描述： | 低成本，三路視頻放大器（低成本，三視頻放大器） |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 136K |
| 代理商： | AD8073 |
AD8072/AD8073
REV. 0
–9–
APPLIC AT IONS
Overdrive Recovery
Overdrive of an amplifier occurs when the output and/or input
range are exceeded. T he amplifier must recover from this over-
drive condition and resume normal operation. As shown in Fig-
ure 28, the AD8072 and AD8073 recover within 75 ns from
positive overdrive and 30 ns from negative overdrive.
25ns
1V
V
IN
V
OUT
Figure 28. Overload Recovery; V
S
=
±
5 V, V
IN
= 8 V p-p,
R
F
= 1 k
, R
L
= 150
, G = +2
Bandwidth vs. Feedback Resistor Value
T he closed-loop frequency response of a current feedback am-
plifier is a function of the feedback resistor. A smaller feedback
resistor will produce a wider bandwidth response. However, if
the feedback resistance becomes too small, the gain flatness can
be affected. As a practical consideration, the minimum value of
feedback resistance for the AD8072/AD8073 was found to be
649
. For resistances below this value, the gain flatness will be
affected and more significant lot to lot variations in device per-
formance will be noticed. Figure 29 shows a plot of the frequency
response of an AD8072/AD8073 at a gain of two with both feed-
back and gain resistors equal to 649
.
On the other hand, the bandwidth of a current feedback ampli-
fier can be decreased by increasing the feedback resistance. T his
can sometimes be useful where it is desired to reduce the noise
bandwidth of a system. As a practical matter, the maximum
value of feedback resistor was found to be 2 k
. Figure 29
shows the frequency response of an AD8072/AD8073 at a gain
of two with both feedback and gain resistors equal to 2 k
.
FREQUENCY – MHz
6.1
G
6.0
0.1
500
1
10
100
5.9
5.8
5.4
5.7
5.6
5.5
R
F
= 2k
R
F
= 649
1 dB
DIV
0.1 dB
DIV
6
7
5
4
3
2
1
0
V
S
=
±
5V
A
V
= +2
R
L
= 150
V
O
= 0.2V p-p
C
Figure 29. Frequency Response vs. R
F
Capacitive Load Drive
When an op amp output drives a capacitive load, extra phase
shift due to the pole formed by the op amp’s output impedance
and the capacitor can cause peaking or even oscillation. T he top
trace of Figure 30, R
S
= 0
, shows the output of one of the am-
plifiers of the AD8072/AD8073 when driving a 50 pF capacitor
as shown in the schematic of Figure 31.
T he amount of peaking can be significantly reduced by adding
a resistor in series with the capacitor. T he lower trace of Fig-
ure 30 shows the same capacitor being driven with a 25
resis-
tor in series with it. In general, the resistor value will have to be
experimentally determined, but from 10
to 50
is a practical
range of values to experiment with for capacitive loads of up to a
few hundred pF.
20ns
50mV
R
S
= 0
R
S
= 25
Figure 30. Capacitive Low Drive
1k
1k
50
V
IN
= 100mV p-p
R
L
1k
C
L
50pF
R
S
Figure 31. Capacitive Load Drive Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8073AR-14 | 制造商:Analog Devices 功能描述:PDIP LOW COST TRIPLE VIDEO AMPLIFIER - Bulk |
| AD8073JN | 制造商:Analog Devices 功能描述:OP Amp Triple Current Fdbk 制造商:Rochester Electronics LLC 功能描述:PDIP LOW COST TRIPLE VIDEO AMPLIFIER - Bulk |
| AD8073JNZ | 功能描述:IC VIDEO AMP TRIPLE 14-DIP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標準包裝:1,000 系列:- 應(yīng)用:驅(qū)動器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| AD8073JR | 制造商:Analog Devices 功能描述:OP Amp Triple Current Fdbk 制造商:Rochester Electronics LLC 功能描述:SOIC LOW COST TRIPLE VIDEO AMPLIFIER - Bulk 制造商:Analog Devices 功能描述:SEMICONDUCTORS ((NW)) |
| AD8073JR-EBZ | 功能描述:BOARD EVAL FOR AD8073JR RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:* 標準包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
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