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| 型号： | AD8051ARTZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/25页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF R-R LDIST LP SOT23-5 |
| 标准包装： | 1 |
| 放大器类型： | 电压反馈 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 170 V/µs |
| -3db带宽： | 110MHz |
| 电流 - 输入偏压： | 1.4µA |
| 电压 - 输入偏移： | 1800µV |
| 电流 - 电源： | 4.8mA |
| 电流 - 输出 / 通道： | 45mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 12 V，±1.5 V ~ 6 V |
| 工作温度： | -40°C ~ 125°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： | 标准包装 |
| 产品目录页面： | 769 (CN2011-ZH PDF) |
| 其它名称： | AD8051ARTZ-REEL7DKR |
AD8051/AD8052/AD8054
Rev. J | Page 17 of 24
APPLICATION INFORMATION
OVERDRIVE RECOVERY
Overdrive of an amplifier occurs when the output and/or input
range is exceeded. The amplifier must recover from this over-
drive condition. As shown in Figure 41, the AD8051/AD8052/
AD8054 recover within 60 ns from negative overdrive and
within 45 ns from positive overdrive.
VO
L
T
S
VS = ±5V
G = +5
RF = 2k
RL = 2k
V/DIV AS SHOWN
100ns
INPUT 1V/DIV
OUTPUT 2V/DIV
01
06
2-
04
0
Figure 41. Overdrive Recovery
DRIVING CAPACITIVE LOADS
Consider the AD8051/AD8052 in a closed-loop gain of +1 with
and Figure 43 show their frequency and time domain responses,
respectively, to a small-signal excitation. The capacitive load
drive of the AD8051/AD8052/AD8054 can be increased by
adding a low value resistor in series with the load. Figure 44
and Figure 45 show the effect of a series resistor on the capaci-
tive drive for varying voltage gains. As the closed-loop gain is
increased, the larger phase margin allows for larger capacitive
loads with less peaking. Adding a series resistor with lower
closed-loop gains accomplishes the same effect. For large
capacitive loads, the frequency response of the amplifier is
dominated by the roll-off of the series resistor and the load
capacitance.
FREQUENCY (MHz)
8
6
4
2
0
–2
–4
–6
–8
–10
G
A
IN
(
d
B
)
–12
0.1
500
100
110
0
106
2-
0
41
VS = 5V
G = +1
RL = 2k
CL = 50pF
VOUT = 200mV p-p
Figure 42. AD8051/AD8052 Closed-Loop Frequency Response; CL = 50 pF
2.60
2.55
2.50
2.45
2.40
VO
L
T
S
VS = 5V
G = +1
RL = 2k
CL = 50pF
50mV
100ns
0
10
62
-04
2
Figure 43. AD8051/AD8052 200 mV Step Response; CL = 50 pF
10000
1000
1
CA
P
ACI
T
IV
E
L
O
A
D
(
p
F
)
100
10
ACL (V/V)
VS = 5V
≤ 30%
OVERSHOOT
RS = 3
RS = 0
123
4
56
VOUT
CL
RS
RF
RG
50
VIN
100mV
STEP
01
06
2-
0
43
Figure 44. AD8051/AD8052 Capacitive Load Drive vs. Closed-Loop Gain
1000
100
10
CAP
A
CI
T
IV
E
L
O
AD
(p
F
)
ACL (V/V)
123
4
56
VOUT
CL
RS
RF
RG
50
VIN
100mV
STEP
VS = 5V
≤ 30%
OVERSHOOT
RS = 0
RS = 10
01
06
2-
04
4
Figure 45. AD8054 Capacitive Load Drive vs. Closed-Loop Gain
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