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| 型号： | AD8014ARTZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/11页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CF LP LN LDIST SOT23-5 |
| 标准包装： | 10,000 |
| 放大器类型： | 电流反馈 |
| 电路数： | 1 |
| 转换速率： | 4600 V/µs |
| -3db带宽： | 480MHz |
| 电流 - 输入偏压： | 5µA |
| 电压 - 输入偏移： | 2000µV |
| 电流 - 电源： | 1.15mA |
| 电流 - 输出 / 通道： | 50mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 12 V，±2.25 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
AD8014
–9–
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 RSERIES 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 RSERIES and CL.
40
30
20
010
15
20
25
CL – pF
10
R
SERIES
–
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
VO =
0.2 V
VO =
0.2 V
Gain
RF
RG
RL = 1 k
RL = 150
+1
1 k
Open
480
430
+2
1 k
1 k
280
260
+10
1 k
111
50
45
–1
1 k
1 k
160
150
–2
1 k
499
140
130
–10
1 k
100
45
40
+2
2 k
2 k
200*
180*
+2
750
750
260*
210*
+2
499
499
280*
230*
*VO = ±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
–0.20
–0.40
0.00
–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
1ST
2ND 3RD
4TH
5TH
6TH
7TH
8TH
9TH 10TH 11TH
DIFFERENTIAL PHASE
–
Degrees
DIFFERENTIAL
GAIN
–
%
Figure 23. Differential Gain and Phase RF = 500, ±5 V, RL =
150
, Driving One Cable, G = +2
0.30
0.20
0.10
–0.10
–0.20
0.60
0.40
0.20
–0.20
–0.40
0.00
–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
0.00
–0.30
DIFFERENTIAL PHASE
–
Degrees
DIFFERENTIAL
GAIN
–
%
Figure 24. Differential Gain and Phase RF = 500, ±5 V, RL =
75
, Driving Two Cables, G = +2
0.60
0.40
0.20
–0.40
–0.60
0.00
–0.80
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
–0.20
0.80
0.60
0.40
0.20
–0.40
–0.60
0.00
–0.80
–0.20
0.80
DIFFERENTIAL PHASE
–
Degrees
DIFFERENTIAL
GAIN
–
%
Figure 25. Differential Gain and Phase RF = 500, ±5 V, RL =
50
, Driving Three Cables, G = +2
Rev. C
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