参数资料
型号: AD8032BR-REEL7
厂商: Analog Devices Inc
文件页数: 7/20页
文件大小: 0K
描述: IC OPAMP VF R-R DUAL LP 8SOIC
标准包装: 750
放大器类型: 电压反馈
电路数: 2
输出类型: 满摆幅
转换速率: 35 V/µs
-3db带宽: 80MHz
电流 - 输入偏压: 450nA
电压 - 输入偏移: 500µV
电流 - 电源: 900µA
电流 - 输出 / 通道: 15mA
电压 - 电源,单路/双路(±): 2.7 V ~ 12 V,±1.35 V ~ 6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SO
包装: 带卷 (TR)
Data Sheet
AD8031/AD8032
Rev. G | Page 15 of 20
DRIVING CAPACITIVE LOADS
Capacitive loads interact with an op amp’s output impedance to
create an extra delay in the feedback path. This reduces circuit
stability and can cause unwanted ringing and oscillation. A
given value of capacitance causes much less ringing when the
amplifier is used with a higher noise gain.
The capacitive load drive of the AD8031/AD8032 can be
increased by adding a low valued resistor in series with the
capacitive load. Introducing a series resistor tends to isolate the
capacitive load from the feedback loop, thereby diminishing its
influence. Figure 46 shows the effects of a series resistor on the
capacitive drive for varying voltage gains. As the closed-loop
gain is increased, the larger phase margin allows for larger
capacitive loads with less overshoot. Adding a series resistor at
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 capacitive load.
1000
10
100
C
A
P
A
C
ITIV
E
LOA
D
(
pF)
CLOSED-LOOP GAIN (V/V)
1
0
1
2
3
4
5
RS = 5
RS = 0
RS = 20
RS = 0, 5
VS = 5V
200mV STEP
WITH 30% OVERSHOOT
RG
RF
RS
CL
VOUT
01056-
046
Figure 46. Capacitive Load Drive vs. Closed-Loop Gain
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