参数资料
| 型号： | AD8091ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/21页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF R-R LDIST LP 8SOIC |
| 标准包装： | 98 |
| 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 ~ 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： | 管件 |
| 产品目录页面： | 770 (CN2011-ZH PDF) |
AD8091/AD8092
Rev. C | Page 13 of 20
DRIVING CAPACITIVE LOADS
A highly capacitive load reacts with the output of the amplifiers,
causing a loss in phase margin and subsequent peaking or even
methods to effectively minimize its effect.
Put a small value resistor in series with the output to isolate
the load capacitor from the amplifier’s output stage.
Increase the phase margin with higher noise gains or by
adding a pole with a parallel resistor and capacitor from
IN to the output.
8
–12
–10
–8
–6
–4
–2
0
2
4
6
0.1
500
100
110
02
85
9-
02
9
FREQUENCY (MHz)
GA
IN
(
d
B
)
VS = 5V
G = +1
RL = 2k
CL = 50pF
VO = 200mV p-p
Figure 29. Closed-Loop Frequency Response: CL = 50 pF
2.50V
100ns
50mV
2.60V
2.45V
2.55V
2.40V
02
85
9-
03
0
VS = 5V
G = +1
RL = 2k
CL = 50pF
Figure 30. 200 mV Step Response: CL = 50 pF
As the closed-loop gain is increased, the larger phase margin
allows for large capacitor loads with less peaking. Adding a low
value resistor in series with the load at lower gains has the same
effect. Figure 31 shows the effect of a series resistor for various
voltage gains. For large capacitive loads, the frequency response
of the amplifier is dominated by the series resistor and capaci-
tive load.
10000
1
10
100
1000
16
5
23
4
02
85
9-
0
31
ACL (V/V)
C
A
P
A
C
ITIV
E
LOA
D
(
p
F)
VS = 5V
30%
OVERSHOOT
RS = 3
RS = 0
RG
RF
RS
CL
VOUT
50
VIN
100mV STEP
Figure 31. Capacitive Load Drive vs. Closed-Loop Gain
OVERDRIVE RECOVERY
Overdrive of an amplifier occurs when the output range and/or
input range is exceeded. The amplifier must recover from this
overdrive condition. The AD8091/AD8092 recover within 60 ns
from negative overdrive and within 45 ns from positive
overdrive, as shown in Figure 32.
02
85
9-
03
2
V/DIV AS SHOWN
100ns
INPUT 1V/DIV
OUTPUT 2V/DIV
VS = ±5V
G = +5
RF = 2k
RL = 2k
Figure 32. Overdrive Recovery
ACTIVE FILTERS
Active filters at higher frequencies require wider bandwidth op
amps to work effectively. Excessive phase shift produced by
lower frequency op amps can significantly impact active filter
performance.
Figure 33 shows an example of a 2 MHz biquad bandwidth filter
that uses three op amps. Such circuits are sometimes used in
medical ultrasound systems to lower the noise bandwidth of the
analog signal before A/D conversion. Note that the unused
amplifiers’ inputs should be tied to ground.
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| AD8091ARZ-REEL | 功能描述:IC OPAMP VF R-R LDIST LP 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:160 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:10 V/µs 增益带宽积:9MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:250µV 电流 - 电源:730µA 电流 - 输出 / 通道:28mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:管件 |
| AD8091ARZ-REEL7 | 功能描述:IC OPAMP VF R-R LDIST LP 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:160 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:10 V/µs 增益带宽积:9MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:250µV 电流 - 电源:730µA 电流 - 输出 / 通道:28mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:管件 |
| AD8091WARTZ-R7 | 功能描述:Voltage Feedback Amplifier 1 Circuit Rail-to-Rail 制造商:analog devices inc. 系列:- 包装:- 零件状态:上次购买时间 放大器类型:电压反馈 电路数:1 输出类型:满摆幅 压摆率:170 V/μs 增益带宽积:- -3db 带宽:110MHz 电流 - 输入偏置:1.4μA 电压 - 输入失调:1.8mV 电流 - 电源:4.8mA 电流 - 输出/通道:45mA 电压 - 电源，单/双（±）:3 V ~ 12 V，±1.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:- 供应商器件封装:- 标准包装:1 |
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