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| 型號： | AD8014ACHIPS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | 400 MHz Low Power High Performance Amplifier |
| 中文描述： | OP-AMP, 6000 uV OFFSET-MAX, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 9/10頁 |
| 文件大小： | 149K |
| 代理商： | AD8014ACHIPS |
AD8014
–9–
REV. B
DRIVING CAPACITIVE LOADS
The AD8014 was designed primarily to drive nonreactive loads.
If driving loads with a capacitive component is desired, best
settling response is obtained by the addition of a small series
resistance as shown in Figure 26. The accompanying graph
shows the optimum value for R
SERIES
vs. Capacitive Load. It is
worth noting that the frequency response of the circuit when
driving large capacitive loads will be dominated by the passive
roll-off of R
SERIES
and C
L
.
40
30
20
0
10
15
20
25
C
L
– pF
10
R
S
V
5
Figure 26. Driving Capacitive Load
Choosing Feedback Resistors
Changing the feedback resistor can change the performance of
the AD8014 like any current feedback op amp. The table below
illustrates common values of the feedback resistor and the per-
formance which results.
Table II.
–3 dB BW
V
O
=
6
0.2 V
R
L
= 1 k
V
480
280
50
160
140
45
200*
260*
280*
–3 dB BW
V
O
=
6
0.2 V
R
L
= 150
V
430
260
45
150
130
40
180*
210*
230*
Gain
R
F
1 k
1 k
1 k
1 k
1 k
1 k
2 k
750
499
R
G
Open
1 k
111
1 k
499
100
2 k
750
499
+1
+2
+10
–1
–2
–10
+2
+2
+2
*V
O
=
±
1 V.
Video Drivers
The AD8014 easily drives series terminated cables with video
signals. Because the AD8014 has such good output drive you
can parallel two or three cables driven from the same AD8014.
Figure 23 shows the differential gain and phase driving one
video cable. Figure 24 shows the differential gain and phase
driving two video cables. Figure 25 shows the differential gain
and phase driving three video cables.
0.10
0.05
0.00
–0.05
–0.10
0.60
0.40
0.20
0.00
–0.20
–0.40
–0.60
0.00
0.02
0.04
0.05
0.05
0.05
0.04
0.04
0.04
0.04
0.03
0.00
0.01
0.10
0.21
0.26
0.28
0.29
0.30
0.30
0.30
0.30
1ST
2ND
3RD
4TH
5TH
6TH
7TH
8TH
9TH
10TH
11TH
D
P
D
Figure 23. Differential Gain and Phase R
F
= 500,
±
5 V, R
L
=
150
, Driving One Cable, G = +2
0.30
0.20
0.10
0.00
–0.10
–0.20
–0.30
0.60
0.40
0.20
0.00
–0.20
–0.40
–0.60
0.00
–0.02
0.03
0.05
0.06
0.06
0.05
0.05
0.07
0.10
0.14
0.00
0.07
0.24
0.40
0.43
0.44
0.43
0.40
0.35
0.26
0.16
1ST
2ND
3RD
4TH
5TH
6TH
7TH
8TH
9TH
10TH
11TH
D
P
D
Figure 24. Differential Gain and Phase R
F
= 500,
±
5 V, R
L
=
75
, Driving Two Cables, G = +2
0.40
0.20
0.00
–0.20
–0.40
–0.60
0.00
0.44
0.52
0.54
0.52
0.52
0.50
0.48
0.47
0.44
0.45
0.00
0.10
0.32
0.53
0.57
0.59
0.58
0.56
0.54
0.51
0.48
1ST
2ND
3RD
4TH
5TH
6TH
7TH
8TH
9TH
10TH
11TH
0.60
0.40
0.20
0.00
–0.20
–0.40
–0.60
0.60
D
P
D
Figure 25. Differential Gain and Phase R
F
= 500,
±
5 V, R
L
=
50
, Driving Three Cables, G = +2
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