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參數(shù)資料
| 型號： | AD811 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Performance Video Op Amp(高性能視頻運放) |
| 中文描述： | 高性能視頻運算放大器（高性能視頻運放） |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 286K |
| 代理商： | AD811 |
AD811
REV. C
–11–
–Operation as a Video Line Driver
T he AD811 has been designed to offer outstanding perfor-
mance at closed-loop gains of one or greater, while driving mul-
tiple reverse-terminated video loads. T he lowest differential gain
and phase errors will be obtained when using
±
15 volt power
supplies. With
±
12 volt supplies, there will be an insignificant
increase in these errors and a slight improvement in gain flat-
ness. Due to power dissipation considerations,
±
12 volt supplies
are recommended for optimum video performance. Excellent
performance can be achieved at much lower supplies as well.
T he closed-loop gain vs. frequency at different supply voltages
is shown in Figure 36. Figure 37 is an oscilloscope photograph
of an AD811 line driver’s pulse response with
±
15 volt supplies.
T he differential gain and phase error vs. supply are plotted in
Figures 38 and 39, respectively.
Another important consideration when driving multiple cables
is the high frequency isolation between the outputs of the
cables. Due to its low output impedance, the AD811 achieves
better than 40 dB of output to output isolation at 5 MHz driv-
ing back terminated 75
cables.
7
6
4
3
2
V
IN
75
–V
S
+V
S
649
0.1μF
0.1μF
75
AD811
649
75
CABLE
75
75
75
CABLE
75
CABLE
75
V #1
V #2
Figure 35. A Video Line Driver Operating at a Gain of +2
12
–6
3
–3
0
1M
9
6
10M
100M
FREQUENCY – Hz
G
G = +2
R = 150
R = R
FB
V =
±
15V
R = 649
V =
±
5V
R = 562
Figure 36. Closed-Loop Gain vs. Frequency, Gain = +2
10
90
100
0%
1V
1V
10ns
V
IN
V
OUT
Figure 37. Small Signal Pulse Response, Gain = +2,
V
S
=
±
15 V
0.10
15
0.03
0.01
6
0.02
5
0.06
0.04
0.05
0.07
0.08
0.09
14
13
12
11
10
9
8
7
SUPPLY VOLTAGE –
±
Volts
D
R = 649
F = 3.58MHz
100 IRE
MODULATED
RAMP
a
b
DRIVING A SINGLE, BACK TERMINATED,
75
COAX CABLE
DRIVING TWO PARALLEL,
BACK TERMINATED, COAX CABLES
a.
b.
Figure 38. Differential Gain Error vs. Supply Voltage for
the Video Line Driver of Figure 35
0.20
15
0.06
0.02
6
0.04
5
0.12
0.08
0.10
0.14
0.16
0.18
14
13
12
11
10
9
8
7
SUPPLY VOLTAGE –
±
Volts
D
R = 649
F = 3.58MHz
100 IRE
MODULATED
RAMP
a
b
DRIVING A SINGLE, BACK TERMINATED,
75
COAX CABLE
DRIVING TWO PARALLEL,
BACK TERMINATED, COAX CABLES
a.
b.
Figure 39. Differential Phase Error vs. Supply Voltage for
the Video Line Driver of Figure 35
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| AD811_04 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Performance Video Op Amp |
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