AD8013ARZ-14 데이터 시트보기 (PDF) - Analog Devices
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AD8013ARZ-14 Datasheet PDF : 12 Pages
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AD8013
RF
+VS
1.0µF
0.1µF
RG
4
AD8013
1.0µF
VIN
11
RT
0.1µF
–VS
15Ω
RS
VO
CL
Figure 28. Circuit for Driving a Capacitive Load
Table II. Recommended Feedback and Series Resistors vs.
Capacitive Load and Gain
CL – pF
20
50
100
200
300
≥500
RF – Ohms
2k
2k
3k
4k
6k
7k
RS – Ohms
G=2
G≥3
25
15
25
15
20
15
15
15
15
15
15
15
100
VIN 90
500mV
50ns
VOUT 10
0%
1V
Figure 29. Pulse Response Driving a Large Load Capacitor.
CL = 300 pF, G = +2, RF = 6k, RS = 15 Ω
Overload Recovery
The three important overload conditions are: input common-
mode voltage overdrive, output voltage overdrive, and input
current overdrive. When configured for a low closed-loop gain,
the amplifier will quickly recover from an input common-
mode voltage overdrive; typically in under 25 ns. When con-
figured for a higher gain, and overloaded at the output, the
recovery time will also be short. For example, in a gain of +10,
with 15% overdrive, the recovery time of the AD8013 is about
20 ns (see Figure 30). For higher overdrive, the response is
somewhat slower. For 6 dB overdrive, (in a gain of +10), the
recovery time is about 65 ns.
100
VIN 90
500mV
50ns
VOUT 10
0%
5V
Figure 30. 15% Overload Recovery, G = +10 (RF = 300 Ω,
RL = 1 kΩ, VS = ±5 V)
As noted in the warning under “Maximum Power Dissipation,”
a high level of input overdrive in a high noninverting gain circuit
can result in a large current flow in the input stage. Though this
current is internally limited to about 30 mA, its effect on the
total power dissipation may be significant.
High Performance Video Line Driver
At a gain of +2, the AD8013 makes an excellent driver for a
back terminated 75 Ω video line (Figures 31, 32, and 33). Low
differential gain and phase errors and wide 0.1 dB bandwidth
can be realized. The low gain and group delay matching errors
ensure excellent performance in RGB systems. Figures 34 and
35 show the worst case matching.
RG
RF
+VS
0.1µF
75Ω
CABLE
4
AD8013
75Ω
75Ω CABLE
VOUT
VIN
11 0.1µF
75Ω
75Ω
–VS
Figure 31. A Video Line Driver Operating at a Gain of +2
(RF = RG from Table I)
PHASE
+1
0
GAIN
–1
–2
–3
–4
–5
–6
1M
VS = +5V
G = +2
RL = 150Ω 0
VS = ±5V –90
–180
–270
VS = ±5V
VS = +5V
10M
100M
1G
FREQUENCY – Hz
Figure 32. Closed-Loop Gain & Phase vs. Frequency
for the Line Driver
+0.2
+0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
G = +2
RL = 150Ω
VS = +5V
VS = ±5V
1M
10M
100M
1G
FREQUENCY – Hz
Figure 33. Fine-Scale Gain Flatness vs. Frequency,
G = +2, RL = 150 Ω
–10–
REV. A
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